Temat: Cephalopoda - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Lamellorthoceratid cephalopods in the cold waters of southwestern Gondwana: Evidences from the Lower Devonian of Argentina
Autorzy:: Cichowolski, M.
Rustan, J.J.
Powiązania:: https://bibliotekanauki.pl/articles/2082150.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Lamellorthoceratidae
Arthrophyllum
Palaeozoic
Talacasto Formation
Malvinokaffric
Realm
Precordillera Basin
Argentina
Opis:: Based on three specimens assigned to Arthrophyllum sp., the family Lamellorthoceratidae is reported from the Lower Devonian Talacasto Formation in the Precordillera Basin, central western Argentina. These Devonian cephalopods have been known only from low to mid palaeolatitudes and its presence in the cold water settings of southwestern Gondwana is notable. A nektonic mode of life, not strictly demersal but eventually pelagic, with a horizontal orientation of the conch is proposed for adults lamellorthoceratids, whereas a planktonic habit is suggested for juvenile individuals. These features would had allow their arrival to this southern basin, explaining their unusual presence in the Malvinokaffric Realm, and reinforcing the need of re-evaluate the distribution pattern of several groups of cephalopods.
Źródło:: Acta Palaeontologica Polonica; 2020, 65, 2; 305-312
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Concentrations of Silurian nautiloid cephalopods from Russia and Kazakhstan
Autorzy:: Bogolepova, O K
Holland, C H
Powiązania:: https://bibliotekanauki.pl/articles/22316.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
cephalopod
Silurian
concentration
Russia
living population
Kazakhstan
paleontology
nautiloid cephalopod
Opis:: Silurian cephalopod limestones known from northern Asia are usually singular beds or horizons of nodules. They range in their taphonomic character from the Mojero river type, with postmortem concentration from rich living populations by relatively gentle bottom currents into a submarine low, to that of the Karabutak Formation of the South Urals, where there has been concentration by strong wave or current action.
Źródło:: Acta Palaeontologica Polonica; 1995, 40, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Non-destructive analysis of pathological belemnite rostra by micro-CT techniques
Autorzy:: Hoffmann, R.
Stevens, K.
Picollier, M.-C.
Mutterlose, J.
Klug, C.
Powiązania:: https://bibliotekanauki.pl/articles/2082134.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Belemnitida
palaeopathology
rostra
micro computed-tomography
diagenesis
Jurassic
Cretaceous
Germany
Opis:: Previously, palaeopathological features of fossil hardparts were often difficult to interpret because it was impossible to decipher their internal structure without destroying the specimens. We applied high-resolution computedtomo graphy (CT) to document such internal structures. This enabled us to describe a variety of pathologies of Jurassic and Cretaceous belemnite rostra. The examined rostra have been assigned to the taxa ?Acrocoelites sp., Belemnello camax spp., Belemnitella sp., Duvalia emerici, Goniocamax sp., Gonioteuthis spp., Hibolithes jaculoides, Neoclavibelus subclavatus, and Pseudobelus sp. The studied pathologies comprise rostra with two apices, bulges, pearls, broken juvenile rostra, highly porous rostra with abnormal growth increments, blunt-rostra, rostra with callus- like structures, and bent- or knee-shaped rostra. In one rostrum the apex has been turned towards the anterior (alveolus) during ontogeny. Additionally, computed-tomography data were used to document diagenetic alterations of the rostra such as silification, sedimentary infill, pyrite formation. Specimens can also be tested for the presence or absence of internal elements (septa, siphuncle) and surface features. Palaeoecological studies clearly benefit from the application of computed-tomography to gain high resolution images of otherwise invisible internal features of extinct organisms, as demonstrated herein.
Źródło:: Acta Palaeontologica Polonica; 2020, 65, 1; 11-27
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Early ontogenetic growth stages of Middle Ordovician orthoceratoid cephalopods from Bohemia
Autorzy:: Aubrechtova, M.
Turek, V.
Zicha, O.
Powiązania:: https://bibliotekanauki.pl/articles/2082221.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Orthoceratida
early ontogeny
embryonic shell
Paleozoic
Darriwilian
Bohemia
Czech
Republic
Opis:: This study describes 18 specimens representing the earliest growth parts of orthoceratoid cephalopods, most of which have been recently obtained from the Middle Ordovician strata of the Prague Basin, central Bohemia. Only about 20 specimens of Ordovician orthoceratoids displaying embryonic shell are known globally and the Bohemian material thus significantly expands their current record. The studied collection includes twelve specimens assigned to the species Bactroceras sandbergeri and shows that the morphological variability in early ontogenetic growth stages of this species was rather low. The absence of a cicatrix was definitely confirmed in this phylogenetically important cephalopod. Six other specimens investigated herein are indeterminate orthoceratids. Initial chambers, where preserved, are generally large compared to known, stratigraphically younger specimens. This is interpreted here as supporting the previously postulated trend of decreasing the egg- and hatchling sizes in orthoceratoid cephalopods from mid-Ordovician times onwards. Alternatively, the large sizes of these Bohemian orthoceratids may be explained by the position of the Prague Basin in relatively cool-water high palaeolatitudes during the Middle Ordovician.
Źródło:: Acta Palaeontologica Polonica; 2020, 65, 3; 575-588
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Virtual 3D modeling of the ammonoid conch to study its hydrostatic properties
Autorzy:: Moron-Alfonso, D.A.
Peterman, D.J.
Cichowolski, M.
Hoffmann, R.
Lemanis, R.E.
Powiązania:: https://bibliotekanauki.pl/articles/2082232.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Ammonoidea
virtual modeling
3D
conch
CT-scan
morphometry
Cretaceous
Antarctica
Opis:: Computed tomography has provided a wealth of biological data that now stands beside a vast, more traditional, morphometric database. By exploiting these two resources, we present a novel methodology to construct intricate, virtual cephalopod shells. As a case of study, we applied this method to Maorites seymourianus using data obtained from a previous work. For this purpose, evaluation of the conch geometry, and the definition of new parameters such as the segment width expansion rate (SWER), segment height expansion rate (SHER), the segment thickness expansion rate (STER), and three indices related, were introduced. The conch geometry of M. seymourianus follows a spiral that can be defined by a polynomial function. While similar to a logarithmic function, a polynomial fit is preferred because it reveals higher values of whorl expansion at the early ontogenetic phase and lower values reaching the adult body chamber. Results on the hydrostatic properties of the virtual models indicate that M. seymourianus would have a near neutral buoyancy, ranging from slightly positive to slightly negative, depending upon parameters that influence organismal mass. Positions of the center of mass and the center of buoyancy indicate that the studied species would have a relatively low hydrostatic stability, estimating a shell orientation of approximately 74–76° with respect to the vertical, with the aperture slightly inclined downwards relative to the horizontal plain.
Źródło:: Acta Palaeontologica Polonica; 2020, 65, 3; 467-480
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Late Cretaceous record of large soft-bodied coleoids based on lower jaw remains from Hokkaido, Japan
Autorzy:: Tanabe, K.
Misaki, A.
Ubukata, T.
Powiązania:: https://bibliotekanauki.pl/articles/945495.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Late Cretaceous
Cretaceous
Cephalopoda
Coleoidea
Vampyromorpha
Teuthida
coleoid
jaw
remains
Hokkaido
Japan
Opis:: The origin and phylogenetic relationships of most modern coleoid groups have not yet been explained by reliable fossil evidence, in large part because of the reduction or disappearance of a calcified chambered shell during their evolutionary history. Herein we describe two exceptionally large coleoid lower jaws from the Upper Cretaceous strata in Hokkaido, Japan. On the basis of the comparison of gross morphology and morphometric data of the lower jaws of modern and fossil coleoids, we assigned the two lower jaws to the following new taxa: Nanaimoteuthis hikidai sp. nov. of the order Vampyromorpha (superorder Octobrachia) and Haboroteuthis poseidon gen. et sp. nov. of the order Teuthida (superorder Decabrachia). The lower jaw of N. hikidai is distinguished from other species of the same genus from the Upper Cretaceous of Vancouver Island (Canada) and Hokkaido by having a broader, more anteriorly curved hood of the outer lamella. The lower jaw of H. poseidon seemingly exhibits mosaic features like those of modern teuthids and sepiids but is assigned to Teuthida on the basis of the overall shape of the outer lamella and the development of a distinct fold on the lateral wall. Because of the unusually large lower jaws, these new taxa appear to be comparable in body size to modern giant squids (Architeuthis spp.) and the Humboldt squid (Dosidicus gigas). This and other discoveries of large jaws referable to octobrachian and decabrachian coleoids from the Upper Cretaceous strata of the North Pacific fill the gap in the relatively poor fossil record of mainly soft-bodied coleoids.
Źródło:: Acta Palaeontologica Polonica; 2015, 60, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A rare coleoid mollusc from the Upper Jurassic of Central Russia
Autorzy:: Doguzhaeva, L A
Powiązania:: https://bibliotekanauki.pl/articles/20063.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
mollusc
Russia
Upper Jurassic
Kostromateuthis roemeri
paleontology
shell ultrastructure
Spirulida
Coleoidea
Opis:: The shell of the coleoid cephalopod mollusc Kostromateuthis roemeri gen. et sp. n. from the lower Kimmeridgian of Central Russia consists of the slowly expanding orthoconic phragmocone and aragonitic sheath with a rugged surface, a weakly developed post-alveolar part and a long, strong, probably dorsal groove. The sheath lacks concentric structure common for belemnoid rostra. It is formed by spherulites consisting of the needle-like crystallites, and is characterized by strong porosity and high content of originally organic matter. Each spherulite has a porous central part, a solid periphery and an organic cover. Tubular structures with a wall formed by the needle-like crystallites are present in the sheath. For comparison the shell ultrastructure in Recent Spirula and Sepia, as well as in the Eocene Belemnosis were studied with SEM. Based on gross morphology and sheath ultrastructure K. roemeri is tentatively assigned to Spirulida and a monotypic family Kostromateuthidae nov. is erected for it. The Mesozoic evolution of spirulids is discussed.
Źródło:: Acta Palaeontologica Polonica; 2000, 45, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A review of the endocerid cephalopod Protocyptendoceras from the Floian [Lower Ordovician] of the Eastern Cordillera, Argentina
Autorzy:: Cichowolski, M
Powiązania:: https://bibliotekanauki.pl/articles/20173.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Floian
endocerid cephalopod
paleontology
cephalopod
Ordovician
Lower Ordovician
Proterocameroceratidae
Endocerida
Argentina
Opis:: Ordovician cephalopods from Western Gondwana are still poorly known and published data is in need of systematic and stratigraphical revision. In this work, the endocerid proterocameroceratid Protocyptendoceras from the Floian of the Eastern Cordillera of Argentina is revised using new material from La Ciénaga, 5 km upstream from Purmamarca. The species P. corvalani and P. teicherti are considered to be junior synonyms of P. fuenzalidae, which is redescribed in detail and reillustrated. Specimens preserve adapical parts of isolated siphuncles, related here to the presence of endocones in a posterior portion. Evidently P. fuenzalidae had a nektobenthic mode of life in a shallow water environment, oriented horizontally. Its palaeobiogeographical affinities are mainly with Floian proterocameroceratids from Eastern Gondwana, such as Anthoceras decorum and the related genera Lobendoceras, Ventroloboceras, and Notocycloceras.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 1; 99-109
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Size-shape relationships in the Mesozoic planispiral ammonites
Autorzy:: Parent, H.
Greco, A.F.
Bejas, M.
Powiązania:: https://bibliotekanauki.pl/articles/19942.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: size-shape relationship
Mesozoic
planispiral ammonite
ammonite
Ammonoidea
shell
Cephalopoda
paleontology
marine fossil
Opis:: Ammonites are of outstanding importance in dating events of the Mesozoic and in the study of mechanisms, modes and timing of evolutionary processes. These applications rely on a detailed understanding of their morphology and the modes of variation. It has been known for a long time that their shape is composed of a number of highly correlated features. A new model, called the ADA−model, is introduced for the study of shell morphology (size and shape). The new model is based on classic dimensions which are stable parameters throughout ontogeny, giving very close agreement between pre− dictions and actual observations. It was applied in the exploration of the morphospace occupied by the planispirally coiled and the regularly uncoiled Mesozoic Ammonoidea, based on two new reduced morphospaces introduced for the analysis. Results obtained expose close relationships between size and shape, and general patterns in the ammonite shell morphol− ogy and morphogenesis. (i) The relative apertural height of the whorl section relative to the diameter of the shell (H₂/D) is involved in definition of size and shape. (ii) This same dimension shows a strong tendency to be H₂/D = 0.3. (iii) There are some geometrically possible shell shapes (or morphotypes) which seem to have not been developed since they are not known in the current record. Assuming the known ranges of protoconch size and whorl number as constraints, the ADA−model strongly suggests that these morphotypes have not been developed for the too large or too small sizes the shells would have attained, well outside of the actual size range of the planispirally coiled Ammonoidea. (iv) The law of covariation is shown to be a general pattern within the planispiral ammonites which describes structured variation of the shell shape. (v) A large fraction of the non−structured variation seems originate in the lack of correlation between the rela− tive umbilical diameter and width of the whorl section.
Źródło:: Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks
Autorzy:: Fuchs, D
Engeser, T.
Keupp, H.
Powiązania:: https://bibliotekanauki.pl/articles/21066.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: gladius
Cephalopoda
systematics
variation
Vampyropoda
coleoid cephalopod
morphology
Trachyteuthis
paleontology
phylogenetic implication
Coleoidea
Opis:: Although the fossil record of coleoid cephalopods is generally poor, the Upper Jurassic Nusplingen and Solnhofen Plattenkalks have provided numerous well−preserved coleoids. Trachyteuthis hastiformis, a comparatively large vampyropod coleoid, was previously known to represent the sole species of its genus in Nusplingen and Solnhofen. However, morphological comparisons based on 50 specimens from different museum collections revealed two additional species: T. nusplingensis sp. nov. and T. teudopsiformis sp. nov. Both species lack the distinct spindle−shaped elevation on the gladius median field typical for T. hastiformis. T. nusplingensis sp. nov. is clearly characterised by a smooth median field and a more or less regular granulation on the dorsal gladius surface, whereas T. teudopsiformis sp. nov. can be easily distinguished by the presence of a Teudopsis−like median keel and an extremely narrow granulation. Morphometric analyses have shown that length−width indices are ambiguous characters to differentiate between the three species. Phylogenetically, the keeled and anteriorly pointed T. teudopsiformis sp. nov. can be linked with the Early Jurassic genus Teudopsis and the Late Cretaceous genus Glyphiteuthis.
Źródło:: Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Minute Silurian oncocerid nautiloids with unusual colour patterns
Autorzy:: Manda, S
Turek, V.
Powiązania:: https://bibliotekanauki.pl/articles/22242.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Silurian
paleontology
oncocerid nautiloid
nautiloid
colour pattern
Cephalopoda
Nautiloidea
taxonomy
shell size
shell malformation
Opis:: A minute Silurian oncocerid Cyrtoceras pollux, from the Prague Basin is assigned here to the genus Pomerantsoceras. The only so far known species of this genus comes from the Upper Ordovician (Hirnantian) of Estonia. Pomerantsoceras thus represents, except for un−revised poorly understood taxa, the single known oncocerid genus surviving the end−Ordovician extinction events. Cyrtoceras pollux is unusual among the Silurian nautiloids because of its small shell. Colour pattern characterised by a few longitudinal bands on the entire circumference of the shell is here reported in oncocerids. Longicone and only slightly curved small shells as in Pomerantsoceras are unusual among nautiloids and resemble straight shells of orthocerids and pseudorthocerids, in which the colour pattern consists of straight colour bands. Consequently the shell shape as well as the colour pattern should be regarded as adaptive convergence with orthocerids and pseudorthocerids. It supports the hypothesis that colour pattern functioned as camouflage and its evolution was under adaptive control. In addition, several types of the shell malformations including anomalous growth of septa, shell wall and pits on an internal mould are described.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 3; 503-512
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Colour patterns in Early Devonian cephalopods from the Barrandian Area: Taphonomy and taxonomy
Autorzy:: Turek, V
Powiązania:: https://bibliotekanauki.pl/articles/21864.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: colour pattern
Early Devonian
Devonian
cephalopod
Barrandian area
taphonomy
taxonomy
Bohemia
paleontology
Cephalopoda
Nautiloidea
fossil
Opis:: Five cephalopod specimens from the Lower Devonian of Bohemia (Czech Republic) preserve colour patterns. They include two taxonomically undeterminable orthoceratoids and three oncocerid nautiloids assigned to the genus Ptenoceras. The two fragments of orthocone cephalopods from the lowest Devonian strata (Lochkovian, Monograptus uniformis Zone) display colour patterns unusual in orthoceratoids. They have irregular undulating and zigzag strips that are preserved on counterparts of adapertural regions of specimens flattened in shale, despite their original aragonitic shell having been completely dissolved. These are probably the result of the proteinous pigment inside the shell wall, being substituted during diagenesis by secondary minerals leaving only an altered trace of the original shell. Orthoceratoids from sediments unsuitable for preservation of this feature discussed here thus demonstrate an exceptional case of preservation of colour patterns, not only within Devonian cephalopods but also within other Devonian molluscs. Three specimens of Ptenoceras that preserve colour patterns come from younger Lower Devonian strata. Oblique spiral adaperturally bifurcating bands are preserved in P. alatum from the Pragian and zigzags in P. nudum from the Dalejan. Juvenile specimen of Ptenoceras? sp. from the Pragian exhibits highly undulating transversal bands—a pattern resembling colour markings in some Silurian oncocerids. Dark grey wavy lines observed on the superficially abraded adapical part of a phragmocone of nautiloid Pseudorutoceras bolli and interpreted formerly to be colour markings are here reinterpreted as secondary pigmented growth lines. Other Devonian fossils including a single brachiopod and several gastropods from the Barrandian Area with preserved colour patterns are mentioned. Variety of cephalopod colour patterns, their taxonomic significance, function and significance for palaeoecological interpretation, palaeoenvironmental conditions favouring colour pattern preservation and systematic affiliation of taxa with colour pattern preserved are discussed.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 3; 491-502
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Molluscs of the Polish Baltic
Autorzy:: Piechocki, A.
Wawrzyniak-Wydrowska, B.
Powiązania:: https://bibliotekanauki.pl/articles/83799.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:: mollusc
Polska
Baltic Sea
benthos
malacofauna
Sphaeriidae
Lymnaeidae
Planorbidae
Polyplacophora
Scaphopoda
Bivalvia
Gastropod
Cephalopoda
species number
Źródło:: Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:: Folia Malacologica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Concentration of juvenile and small cephalopods in the Hirnantian cherts [Late Ordovician] of Porkuni, Estonia
Autorzy:: Kroger, B
Powiązania:: https://bibliotekanauki.pl/articles/20351.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: juvenile cephalopod
Cephalopoda
Nautiloidea
small adult cephalopod
cephalopod
Late Ordovician
Ordovician
life mode
Porkuni village
paleontology
Estonia
Opis:: The quarry in the north Estonian village of Porkuni provides a succession of shallow−water limestones and cherts spanning the Ashgillian Normalograptus? extraordinarius graptolite Biozone. This interval comprises the initial pulse of the end−Ordovician extinction. The succession of Porkuni contains abundant and extraordinarily well−preserved fossils. 71 cephalopod specimens were extracted from these strata at Porkuni. Many of these specimens are fragments of juvenile shells or small adults. The embryonic shells of the cephalopods are usually preserved and provide insight into their early ontogeny. The faunal composition is considered as autochthonous and reflects a “palaeo−nursery” in a Hirnantian reef environment. The collected specimens represent twelve genera and four orders. Small oncoceridans and orthoceridans dominate the association. The rate of endemism is very high, since only two genera found in Porkuni, are known from outside Baltoscandia. The new genera Parvihebetoceras, Pomerantsoceras, Porkunioceras, and the new species Parvihebetoceras wahli, Pomerantsoceras tibia, Porkunioceras tuba, and Strandoceras orvikui are erected.
Źródło:: Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Cephalopods (Mollusca: Cephalopoda) in the palaeontological collection of the Faculty of Biology, Adam Mickiewicz University
Autorzy:: Konwerski, S.
Bloszyk, J.
Powiązania:: https://bibliotekanauki.pl/articles/84387.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:: cephalopod
Mollusca
Cephalopoda
paleontological collection
Faculty of Biology
Adam Mickiewicz University
Poznan city
Baculites
belemnite
ammonite
shell
fossil
Źródło:: Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:: Folia Malacologica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Soft-tissue attachments in orthocerid and bactritid cephalopods from the Early and Middle Devonian of Germany and Morocco
Autorzy:: Kroger, B
Klug, C.
Mapes, R.
Powiązania:: https://bibliotekanauki.pl/articles/20326.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cephalopoda
Germany
Orthocerida
Emsian
Morocco
Middle Devonian
soft tissue attachment
Early Devonian
Bactritida
muscle scar
Eifelian
Devonian
cephalopod
paleontology
Opis:: In the Early to Middle Devonian shale sequences of Germany and Morocco, pyritised and secondarily limonitised cephalopod remains are common. Details of the soft−tissue attachment structures are sometimes preserved on the internal moulds of the body chamber and phragmocone of these cephalopods. Some of the studied Orthocerida show a very faint annular elevation and a dorsal furrow. A few Bactritida show a distinctive annular elevation with two circular bands. The bands form a paired or threefold lobe at the dorsum of the shell. Morphological differences between Orthocerida and Bactritida suggest different soft part morphologies. A comparison of the attachment scars shows that the Bactritida are intermediate between the Orthocerida and ammonoids with regard to their muscle attachment scars. The shape of the muscle scars are interpreted as indication for a planktonic lifestyle in Orthocerida and a comparatively active, nektonic lifestyle in Bactritida and ammonoids. The new genus Acanthomichelinoceras is erected. Acanthomichelinoceras commutatum, Cycloceras sp., Bactrites gracile, Bactrites sp. A, Bactrites sp. B, and Bactrites sp. C are described.
Źródło:: Acta Palaeontologica Polonica; 2005, 50, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Aalenian (Jurassic) to Berriasian (Cretaceous) chronostratigraphic zonation and guide ammonites of the Central Andes (Argentina, Chile, Peru)
Autorzy:: Parent, Horacio
Powiązania:: https://bibliotekanauki.pl/articles/2204237.pdf
Data publikacji:: 2022
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Neuquén Basin
Tarapacá Basin
chronostratigraphy
zonation
biohorizons
Ammonoidea
Cephalopoda
Aalenian to Berriasian
Basen Neuquén
Kotlina Tarapacá
chronostratygrafia
podział na strefy
biohoryzont
głowonogi
Opis:: In the Central Andes there are developed two marine basins with an extensive Jurassic record: the Neuquén (or Central Andean) Basin and the Tarapacá Basin. Their Jurassic and Lower Cretaceous ammonite successions have been studied extensively for more than 150 years, producing detailed chronostratigraphic scales based on ammonite zones and biohorizons. The ammonite faunas include Andean lineages, and cosmopolitan, Tethyan, Caribbean, North American, and Indo-Madagascan elements. This paper presents the results of a revision of the zonation of the interval Aalenian-Berriasian. Before presenting the results, this paper emphasizes the distinction between, and the convenient nomenclature for, biozones, zones, standard zones, and biohorizons. The scissum Hz. (new) is introduced in the lower (-most?) Manflasensis Zone (Aalenian). The Rotundum Subzone (new) with base at the cf.-leptus Hz., is introduced for the upper part of the Rotundum Zone (Bajocian). The Gulisanoi Zone (Bathonian) is standardized by designation of the cf.-aspidoides Hz. (new) as its base. The Chacaymelehuensis Zone (new) with base at the “prahecquense” Hz. (new) is introduced for the Callovian. The Cubanensis Zone (Oxfordian) is introduced to replace nominally, or to rename, the inconveniently named “Passendorferia” Zone. The Tarapacaense Zone (Oxfordian) is standardized by designation of the tarapacaense Hz. (new) as its base. The Tithonian Malarguensis Zone (formerly subzone) is here emended and standardized by designation of the malarguensis Hz. as its base; this zone replaces the unviable Mendozanus Zone. The Zitteli Zone is standardized by designation of the widely recorded perlaevis Hz. as its base. The Fascipartita Subzone (Internispinosum Zone) is standardized by designation of the internispinosum-beta Hz. (new) as its base. The Alternans Zone is standardized by designation of the vetustum Hz. as its base, and the Koeneni Zone (uppermost Tithonian) by designation of the striolatus Hz. as its base.
Źródło:: Volumina Jurassica; 2022, 20; 1--46
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Triassic coleoid beaks and other structures from the Calcareous Alps revisited
Autorzy:: Doguzhaeva, L.A.
Summesberger, H.
Brandstaetter, F.
Gruber, D.
Tintori, A.
Powiązania:: https://bibliotekanauki.pl/articles/31341404.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
Triassic
coleoid
beak
Cephalopoda
Coleoidea
Phragmoteuthis
vertebrate
invertebrate
structure
cephalopod
Phragmoteuthis bisinuata
Lunzoteuthis schindelbergensis
Glochinomorpha stifeli
Calcareous Alps Mountains
Alps Mountains
Źródło:: Acta Palaeontologica Polonica; 2022, 67, 3; 655-666
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Aragonitic rostra of the Turonian belemnitid Goniacamax: arguments from diagenesis
Autorzy:: Dauphin, Y
Williams, C.T.
Barskov, I.S.
Powiązania:: https://bibliotekanauki.pl/articles/20211.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Turonian
sea shell
Cephalopoda
belemnite
calcite
Goniocamax
rostrum
skeleton
sea cephalopod
diagenesis
paleoenvironment
freshwater shell
Belemnitida
aragonite
Siberia
belemnitid rostrum
Piasina River
paleontology
Opis:: The hypothesis that belemnitid rostra are formed by primary biogenic low−Mg calcite is widespread. However, the coexistence in the same rostrum of both aragonitic and calcitic components has been reported in true belemnites (Goniocamax, Turonian). A combined microstructural and chemical composition study of the comparison of shells with undisputed mineralogy from the same site as the Turonian Goniocamax, shows that these aragonitic shells display the effects of diagenetic alteration. These observations favour the hypothesis that belemnite rostra are composed of primary aragonite, rather than low−Mg calcite, and are consistent with all other cephalopod shells. Calcitic and aragonitic rostra are also known in other Dibranchiata such as Triassic Aulacocerida and Eocene Belopterina. Diagenetic changes such as shown here may clearly affect palaeo−environmental interpretations based on carbonate shells.
Źródło:: Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Autorzy:: Kroger, B
Powiązania:: https://bibliotekanauki.pl/articles/20263.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: fauna
Cephalopoda
Orthoceratacea
Archigeisonoceras folkeslundense
Archigeisonoceras repplingense
Plagiostomoceras fragile
Nautiloidea
nautiloid
Nilssonoceras latisiphonatum
Archigeisonoceras picus
Kinnekulloceras kinnekullense
orthoceratacean nautiloid
Middle Ordovician
Ordovician
Baltoscandic Orthoceratite Limestone
paleontology
Opis:: The fauna of the Baltoscandic Orthocerataceae is important because it fills a documentary gap between the Lower Ordovician fauna of North America and the upper Middle Ordovician fauna of China and North America. A revision of the Orthoceratidae, Geisonoceratidae, and Arionoceratidae is given on a material of more than 450 specimens. Intraspecific and ontogenetic variations were observed. The following new taxa are erected: Plagiostomoceras fragile sp. nov., Archigeisonoceras repplingense sp. nov., Archigeisonoceras picus sp. nov. Archigeisonoceras folkeslundense sp. nov., Nilssonoceras latisiphonatum gen. et sp. nov., Kinnekulloceras kinnekullense gen. et sp. nov., and Arionoceras lotskirkense sp. nov. The genus Archigeisonoceras is described for the first time in the Baltoscandic area and the oldest occurrence of the genus Arionoceras is documented from the Middle Ordovician of Baltoscandia. It is shown that the endosiphuncular deposits of the Middle Ordovician orthoceratacaceans are highly variable and widespread in the apical parts of the phragmocone.
Źródło:: Acta Palaeontologica Polonica; 2004, 49, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki