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Wyświetlanie 1-15 z 95
Tytuł:
Early Cretaceous multituberculate mammals from the Kuwajima Formation [Tetori Group], central Japan
Autorzy:
Kusuhashi, N
Powiązania:
https://bibliotekanauki.pl/articles/22148.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Tedoribaatar
Cretaceous
paleontology
Kuwajima Formation
Eobaataridae
Japan
Tetori Group
Hakusanobaatar
Multituberculata
Early Cretaceous
Mammalia
Opis:
Hakusanobaatar matsuoi gen. et sp. nov. and Tedoribaatar reini gen. et sp. nov. are multituberculate mammals recovered from the Lower Cretaceous (Barremian to lower Aptian) Kuwajima Formation of the Tetori Group in the Shiramine district, Hakusan City, Ishikawa Prefecture, central Japan. Hakusanobaatar matsuoi is an eobaatarid multituberculate characterized by a P4 with cusp formula 3:5, and a P5 with cusp formula 2:6:?2. One of the specimens of H. matsuoi has the best preserved upper premolar series among known eobaatarid specimens. Based on the dentition of H. matsuoi, it is highly probable that the cimolodontan P4 is homologous with the “plagiaulacidan” P5. Tedoribaatar reini is also tentatively attributed to Eobaataridae, and shows a single−rooted p3 and loss of at least the permanent p2. On the basis of these apomorphic features, T. reini is considered to be the “plagiaulacidan” multituberculate that is most closely related to cimolodontans.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Gzhelian pteridosperms with callipterid foliage of the Donets Basin, Ukraine
Autorzy:
Boyarina, N
Powiązania:
https://bibliotekanauki.pl/articles/23044.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Eight species of pteridosperms with callipterid foliage belonging to four genera are described from the upper Gzhelian of Donets Basin. The fossils indicate that the fronds of the callipterids belonging to the genera Lodevia, Dichophyllum, and Raminervia are bipartite in the upper part and are distinguished by the morphology of the penultimate order pinnae. The main diagnostic character of callipterid species with dissected pinnules is the shape of the pinnule segments. The degree of segmentation of pinnules and their size are considered to represent intraspecific variability expressing the heteroblastic development of the foliage. The taphonomical features of the plant remains and facies interpretations of the plant−bearing strata, including floodplain, floodplain−lacustrine and lacustrine deposits, indicate that the callipterids were dominant elements of the floodplain vegetation in the late Gzhelian.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 2; 343-359
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oldest diving anseriform bird from the late Eocene of Kazakhstan and the evolution of aquatic adaptations in the intertarsal joint of waterfowl
Autorzy:
Zelenkov, N.
Powiązania:
https://bibliotekanauki.pl/articles/2082270.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Aves
Anseriformes
diving
evolution
intertarsal joint
Eocene
Kazakhstan
Central Asia
Opis:
A specialized diving lifestyle has repeatedly evolved in several lineages of modern and fossil waterfowl (Anseriformes), with the oldest previously known representative being the late Oligocene Australian oxyurine ducks Pinpanetta. However, diving specializations have never been previously documented for any of the primitive Paleogene anseriforms (“ stem-anatids”), and thus may be associated with the origin of modern anatid-like body plan. Here I describe a tarsometatarsus of a new duck-sized diving anseriform bird from the latest Eocene (late Priabonian) Kusto Svita in Eastern Kazakhstan, which predates the previously reported occurrence of diving specialization in Anseriformes by at least 6 MA. The new taxon Cousteauvia kustovia gen. et sp. nov. has an unusual and previously undocumented morphology, but partly resembles the stem-anatids Paranyrocidae and Romainvilliidae, thus representing the first known occurrence of diving adaptations in primitive non-anatid anseriforms. The evolutionary appearance of specialized waterfowl taxa in the late Eocene of Central Asia supports a view that this region might have played an important role in the evolution of morphologically derived Anseriformes. The structure of the intertarsal joint in basal and modern anseriforms is here further discussed in relation with adaptations for aquatic locomotion. The presence of elongate and evenly narrow condyles of the tibiotarsus in Anatidae and other swimming/diving birds allows a firm contact with the hyperprotracted tarsometatarsus at the initial phase of the propulsion. This morphology contrasts with the restricted condyles of Presbyornithidae, which indicate a different, strictly wading locomotory specialization. Cousteauvia obviously evolved diving specializations on the basis of a more primitive structure of the intertarsal joint.
Źródło:
Acta Palaeontologica Polonica; 2020, 65, 4; 733-742
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coral paleozoogeography in the Devonian and Carboniferous of Eurasia
Autorzy:
Dubatolov, V.N.
Vassiljuk, N.P.
Powiązania:
https://bibliotekanauki.pl/articles/20824.pdf
Data publikacji:
1980
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Eight provinces of coral distribution were established in the Early Devonian of Eurasia and Australia: Mediterranean, Maghrebian, Uralo-Tien-Shan, Altai-Sayan, Dzhungar-Balkhash, Indo-Sinian, East-Australian, Mongolo-Okhotsk and Indlgiro-Kolymian. In the Middle Devonian large transgression caused enlargement of the provinces. As a result there appear such provinces as: Mediterranean, Uralo-North Asiatic, Mongolo-Okhotsk, Sino-Australian. Each province includes several zoogeographic areas. There are 4 regions (European, South Asian, Australian and North American) with 15 provinces in paleozoogeographical zonation of the Lower Carboniferous (Viséan) paleobasins and 3 regions (Ural-Arctic, Mediterranean, North American) with 7 provinces in the Late Carboniferous (Moscovian) paleobasins.
Źródło:
Acta Palaeontologica Polonica; 1980, 25, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Callipterid pteridosperms from the Early Permian of Ukraine
Autorzy:
Boyarina, N
Powiązania:
https://bibliotekanauki.pl/articles/21331.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paprocie nasienne
perm
skamienialosci
paleobotanika
Raminervia
paleontologia
Raminervia mariopteroides
Ukraina
Opis:
In terrigenous rocks of the early Permian age, below the limestone P6, of the Western Donets Basin two new pteridosperm species have been identified. One of them had phyllosperms with seed scars situated near the base and in the middle part of a pinnule, at the ends of vein-like off-shoots. Its foliage consists of dichotomously branched pinnate to tripinnate fronds, sphenopteroid pinnules and intercalary pinnae and pinnules. The foliage is very variable. Immature, semi-mature, and mature pinnae and pinnules are known. These plants grew probably along the margins of floodplain lakes. The name Raminervia mariopteroides gen. et sp. n. is proposed here for them. The second species, Dichophyllum cuneata sp. n., is characterized by pinnate to bipinnate fronds with a dichotomy of the primary rachis, broadly wedge-shaped pinnules and similarly shaped intercalary pinnules. Plants of the species probably grew on elevated lots of the floodplain and on the alluvial-lacustrine plain.
Praca zawiera opis dwu nowych gatunków permskich paproci nasiennych o liściach typu „Callipteris” (nazwa ta jest młodszym synonimem rodzaju dzisiejszych paproci i w paleobotanice paleozoiku nie może być używana). Jeden z tych gatunków stanowi podstawę do wydzielenia nowego naturalnego rodzaju Raminervia.
Вивченi рештки викопних рослин виявленi в ранньопермських вiдкладах Захiдного Донбасу. Викопний матерiал зiбpaн в аргілiтових та алевролiтових вiдкладах озерного i алювiально-озерного генезису в iнтервалi poзpiзy мiж вапняками Р⁰₅ та Р₆. Описано один природний рiд Raminervia gen. n. та два види - Raminervia mariopteroides sp. n. i Dichophyllum cuneata sp. n. Рiд Raminervia характеризуеться фiдоспермами, якi при основi та в середнiй частинi несуть насiннi рубцi. До кожного рубця пiдходить вiдгалуження жилки. Листи Raminervia mariopteroides дихотомічно-перистi тричi псристо-складнi, з дихотоміϵю головної oci, сфеноптеридними лопатевими пiр’ячками та промiжними елементами останного та передостаннього порядку. Пiр’я i пiр’ячки мор-фолопчно рiзноманiтнi, що обумовлено рiзними стадiями росту листа. Листи Dichopyllum cuneata дiхотомiчно-перистi двічi перисто-складнi, з дихотомiею головної oci, широко клиновидними пір’ячками, розciченними на сегменти майже до основи, та з проміжними елементами останнього порядку. Виходячи iз морфологiчних i тафономiчних ознак рослинних решток та з генезису порід, рослини виду R. mariopteroides росли по берегам заплавних озер, утворюючи озерно-заплавні фiтоценози, а представники виду D. cuneata буди розповсюджені на пiдвищених дiлянках заплави та алювiально-озерної рiвнини.
Źródło:
Acta Palaeontologica Polonica; 1994, 39, 1; 117-133
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early ontogeny of Jurassic bakevelliids and their bearing on bivalve evolution
Autorzy:
Malchus, N
Powiązania:
https://bibliotekanauki.pl/articles/22830.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
phylogenesis
Pteriomorphia
Bakevelliidae
shell
bakevelliid
larva shell
Jurassic
bivalve
ontogenesis
Bivalvia
evolution
larva
paleontology
Opis:
Larval and earliest postlarval shells of Jurassic Bakevelliidae are described for the first time and some complementary data are given concerning larval shells of oysters and pinnids. Two new larval shell characters, a posterodorsal outlet and shell septum are described. The outlet is homologous to the posterodorsal notch of oysters and posterodorsal ridge of arcoids. It probably reflects the presence of the soft anatomical character post−anal tuft, which, among Pteriomorphia, was only known from oysters. A shell septum was so far only known from Cassianellidae, Lithiotidae, and the bakevelliid Kobayashites. A review of early ontogenetic shell characters strongly suggests a basal dichotomy within the Pteriomorphia separating taxa with opisthogyrate larval shells, such as most (or all?) Praecardioida, Pinnoida, Pterioida (Bakevelliidae, Cassianellidae, all living Pterioidea), and Ostreoida from all other groups. The Pinnidae appear to be closely related to the Pterioida, and the Bakevelliidae belong to the stem line of the Cassianellidae, Lithiotidae, Pterioidea, and Ostreoidea. The latter two superfamilies comprise a well constrained clade. These interpretations are consistent with recent phylogenetic hypotheses based on palaeontological and genetic (18S and 28S mtDNA) data. A more detailed phylogeny is hampered by the fact that many larval shell characters are rather ancient plesiomorphies.
Źródło:
Acta Palaeontologica Polonica; 2004, 49, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Jurassic–Early Cretaceous oysters from Siberia: a systematic review
Autorzy:
KOSENKO, IGOR N.
Powiązania:
https://bibliotekanauki.pl/articles/945953.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bivalvia
ostreoidea
gryphaeidae
jurassic
cretaceous
siberia
Opis:
The present study reviews the taxonomy of Late Jurassic–Early Cretaceous oysters from the Northern and the Subpolar Urals (Western Siberia) and northern East Siberia. Previous studies have documented 10 species from the genus Liostrea (L. delta, L. cucurbita, L. praeanabarensis, L. anabarensis, L. plastica, L. gibberosa, L. planoconvexa, L. siberica, L. uralensis, L. lyapinensis), and 3 species from the genus Gryphaea (G. borealis and 2 species in open nomenclature). Liostrea gibberosa, L. planoconvexa, L. uralensis, and L. cucurbita are transferred in this study to the genus Pernostrea. Furthermore, two new species of Pernostrea are described: P. mesezhnikovi sp. nov. and P.? robusta sp. nov. Liostrea siberica is transferred to the genus Praeexogyra. Liostrea praeanabarensis and L. anabarensis are attributed to the subgenus Boreiodeltoideum (genus Deltoideum) as well as L. delta sensu Zakharov (1966) which is described here as new species Deltoideum (Boreiodeltoideum) borealis sp. nov. The similar shell morphology of the genera Deltoideum and Pernostrea provides a basis to establish the new tribe Pernostreini trib. nov. in the subfamily Gryphaeinae. Three species are recorded for the first time from Siberia: Nanogyra? cf. thurmanni, “Ostrea” cf. moreana and Gryphaea (Gryphaea) curva.
Źródło:
Acta Palaeontologica Polonica; 2017, 62, 4; 759-778
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carboniferous Rugosa and Heterocorallia from boreholes in the Lublin region (Poland)
Karbońskie Rugosa i Heterocorallia z wierceń na Lubelszczyżnie
Karbonskie Rugosa i Heterocorallia iz burovykh skvazhin jugo-vostochnojj Pol’shi
Autorzy:
Khoa, N.D.
Powiązania:
https://bibliotekanauki.pl/articles/20053.pdf
Data publikacji:
1977
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Carboniferous
Rugosa
Heterocorallia
borehole
Lublin region
Polska
Źródło:
Acta Palaeontologica Polonica; 1977, 22, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Astrorhizae-like structures on epitheca of rugose corals from the Carboniferous of Laos
Autorzy:
Hung, N H
Powiązania:
https://bibliotekanauki.pl/articles/23243.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Carboniferous
astrorhizae-like structure
Laos
stromatoporoid
Hydractinia echinata
rugose coral
Calceola sandalina
coral
Clionolithes reptans
paleontology
Opis:
Stellate patterns, called astrorhizae, occurring in some Paleozoic stromatoporoids are by most authors regarded as integral elements of these enigmatic fossils. The finding of stellate structures on epithecae of rugose corals from the Lower Carboniferous of Central Laos seems to support, however, the idea that astrorhizae in Paleozoic stromatoporoids may represent traces of foreign organisms.
Źródło:
Acta Palaeontologica Polonica; 2001, 46, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early steps in the radiation of notoungulate mammals in southern South America: A new henricosborniid from the Eocene of Patagonia
Autorzy:
Bauza, N.
Gelfo, J.N.
Lopez, G.M.
Powiązania:
https://bibliotekanauki.pl/articles/22004.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Here we describe a new notoungulate mammal from the early Eocene (Itaboraian SALMA) of Chubut, Argentinian Patagonia, from the localities of Las Flores and Las Violetas Farm, represented by fragments of maxilla and isolated teeth. The specimens were found in the Las Flores Formation, Río Chico Group, and assigned to the Henricosborniidae, a primitive family within the order Notoungulata. Orome deepi gen. et. sp. nov. differs from other henricosborniids in a less developed metacone column in the upper molars, a larger metaloph in the third upper molar and a larger mean size. The morphometric analysis does not show any difference between the individuals of the two studied localities. The new addition to the henricosborniid diversity in Patagonia allows to provide a better understanding of the early radiation of notoungulates in South America.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Autorzy:
Kosenko, I.N.
Powiązania:
https://bibliotekanauki.pl/articles/20123.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Berriasian (Early Cretaceous) oyster Pycnogryphaea weberae from Crimea is one of the earliest known pycnodonteine oysters. Examination of shell morphology and microstructure of this species shows that it shares characters of the subfamilies Gryphaeinae and Pycnodonteinae. Shell microstructure of Pycnogryphaea weberae lacks vesicular structure and is similar to microstructure of the genus Gryphaea. At the same time the shell of this species possesses morphological characters typical of pycnodonteins: development of chomata and well-defined circumferential curb. Pycnogryphaea weberae is regarded as a transitional taxon between the subfamilies Gryphaeinae and Pycnodonteinae and referred herein to a new genus Pycnogryphaea within the Pycnodonteinae. This suggests that the subfamily Pycnodonteinae likely originated from the Late Jurassic representatives of the genus Gryphaea (Gryphaeinae) in Berriassian. First pycnodonteins preserved shell microstructure of the genus Gryphaea but developed chomata along all the perimeter of both valves.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mode of life of graptolites
Autorzy:
Hartshorne Kirk, N.
Powiązania:
https://bibliotekanauki.pl/articles/22778.pdf
Data publikacji:
1978
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Źródło:
Acta Palaeontologica Polonica; 1978, 23, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossilized pollination droplet in a new seed genus from the Middle Triassic of Nidpur, India
Autorzy:
Bhowmik, N.
Parveen, S.
Powiązania:
https://bibliotekanauki.pl/articles/946032.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
plantae
ginkgoopsida
rugaspermum
pollen
seed
pollination
micropyle
compression
triassic
india
Opis:
The present article reports a fossilized pollination droplet at the micropylar orifice in a compressed seed Gopadispermum papillatus gen. et sp. nov. from the Middle Triassic beds of Nidpur, Madhya Pradesh, India. The shapeless droplet forming a convexity above the micropylar orifice is comprised of a resinous crystalline substance. Entrapped within the droplet are a few saccate pollen grains. The seeds are small, oblong to widely elliptical in shape, about 3 mm long and generally 2 mm broad. The micropylar end shows a short straight beak-like micropyle often extended beyond a persistently adhering wrinkled tissue lying outside the seed coat. The seed is composed of four membranes excluding the adherent tissue. They are the outer and inner cuticles of integument, the nucellar cuticle distally modified to form a dark collar-like pollen chamber and the innermost megaspore membrane. Cuticles of the tissue adhering to seed coat are different from seed coat cuticles. The pollen grains inside the pollen chamber are frequently clumped together forming a pollen mass. Individual pollen grains appear spheroidal to ellipsoidal in shape and are saccate. This is the first report of the preservation of a pollination droplet in a compressed seed specimen from the Nidpur Triassic beds. Preservation of the droplet can be attributed to its supposed resinous constitution and the entrapped organic contents (pollen grains). Occurrence of clumped pollen grains inside the pollen chamber also indicated possibility of fluid feeding, pollinivory, and insect pollination in the seeds.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 2; 491-503
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 95

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