Temat: significance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ecological significance of the arthropod fauna from the Jurassic (Callovian) La Voulte Lagerstatte
Autorzy:: Charbonnier, S.
Vannier, J.
Hantzpergue, P.
Gaillard, Ch.
Powiązania:: https://bibliotekanauki.pl/articles/22428.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: ecological significance
arthropod
fauna
Jurassic
Callovian
Lagerstatte
Arthropoda
Crustacea
Thylacocephala
France
paleontology
Opis:: The La Voulte Lagerstätte is remarkable for its unique soft−bodied fauna (e.g., worms, coleoid squids) and its exceptionally preserved arthropods mainly found in small sideritic concretions. This arthropod fauna includes 30 different species assigned to the crustaceans, the thylacocephalans and the pycnogonids. Crustaceans are the most diversified group with 23 species distributed in a dozen families. Quantitative analyses based on 388 nodules reveals four dominant groups: (i) the enigmatic thylacocephalan arthropods (33%), (ii) the Solenoceridae shrimps (22%), (iii) the Coleiidae crustaceans (15%), and (iv) the Penaeidae shrimps (10%). Converging lines of evidence from depositional environment and modern analogues, indicate that this arthropod fauna probably inhabited a deep water setting most probably exceeding 200 m (= bathyal zone) under dysphotic or aphotic conditions. This new set of data sheds new light on the deep−sea colonisation by animal communities in the Mesozoic.
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: 2.

Tytuł:: Lanea carlsi conodont apparatus reconstruction and its significance for subdivision of the Lochkovian
Autorzy:: Slavik, L.
Powiązania:: https://bibliotekanauki.pl/articles/20418.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Lanea carlsi
conodont
apparatus reconstruction
significance
Lochkovian
Conodonta
taxonomy
phylogenesis
biostratigraphy
Barrandian
Opis:: A cosmopolitan spathognathodontid taxon “Ancyrodelloides carlsi” is not regarded in this paper as one of the earliest known representatives of Ancyrodelloides according to former concepts, but is considered as conspicuous member of the genus Lanea. The taxon shows distinct morphological innovation of the upper surface of the Pa element within the Lanea lineage which makes it easily recognizable worldwide and suitable for global correlation. Presented stratigraphic correlation using conodonts and other faunal groups qualifies a short−lived Lanea carlsi as probably the best marker of the middle Lochkovian base. This paper presents reconstruction of the apparatus of L. carlsi which is the first complete reconstruction in the genus Lanea. The comparison of the Lanea apparatus and assumed apparatus of early Ancyrodelloides from the Požáry Quarries (Barrandian, Czech Republic) resulted to proposal of an alternative concept of evolution of these two genera. The relatively short−lived genus Ancyrodelloides is considered to split off from the Lanea clade in the late middle Lochkovian by the entry of Ancncyrodelloides transitans.
Źródło:: Acta Palaeontologica Polonica; 2011, 56, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Systematic and biostratigraphic significance of a chinchillid rodent from the Pliocene of eastern Argentina
Autorzy:: Rasia, L.L.
Candela, A.M.
Powiązania:: https://bibliotekanauki.pl/articles/22264.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: systematics
biostratigraphy
significance
chinchillid rodent
rodent
Mammalia
Rodentia
Caviomorpha
Chinchillidae
paleontology
Pliocene
Argentina
Opis:: Two species of chinchillid rodents, Lagostomus (Lagostomopsis) incisus and “Lagostomus (Lagostomopsis) spicatus”, have been recorded from the Monte Hermoso Formation (Montehermosan–Lower Chapadmalalan, Early Pliocene) of southern Buenos Aires Province, eastern Argentina. L. (L.) incisus is based on skull remains,while “L. (L.) spicatus” is based onmandible remains and fragmentary skulls. Detailed study of specimens recovered from the upper section of the Monte Hermoso Formation, from the Irene “Formation”, and the Chapadmalal Formation (late Early–early Late Pliocene, Buenos Aires Province), some of them represented by associated skull and mandible remains, indicates that L. (L.) incisus and “L. (L.) spicatus” are synonymous, with the valid name being L. (L.) incisus. The differences between both nominal species are here attributed to different ontogenetic states and sexual dimorphism. The stratigraphic provenance of the fossil material of L. (L.) incisus indicates a temporal distribution of this species restricted to theMontehermosan?–Chapadmalalan (Early–early Late Pliocene), instead of the Montehermosan (Early Pliocene).
Źródło:: Acta Palaeontologica Polonica; 2013, 58, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A new genus of Norian involutinid foraminifers: Its morphological, biostratigraphic, and evolutionary significance
Autorzy:: Rigaud, S.
Martini, R.
Rettori, R.
Powiązania:: https://bibliotekanauki.pl/articles/21780.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: new genus
Norian involutinid foraminifer
foraminifer
morphology
biostratigraphy
evolutionary significance
Foraminifera
strengthening
shortened lamella
symbiosis
Triassic
lamella
paleontology
Opis:: The Late Triassic was a time of pronounced radiation in several groups of foraminifers. The rapid evolutionary processes in the Suborder Involutinina caused particularly high diversification of these aragonitic foraminifers, which became a key group for Upper Triassic biostratigraphy. Among them, Triasina hantkeni and Triasina oberhauseri are regarded as the most precise guide fossils. However, while these species are widely used, a poor documentation of the detailed test struc− ture of T. oberhauseri has resulted in misidentifications. The exceptional preservation and abundance of Triasina oberhauseri in the Upper Triassic deposits of the Black Marble Quarry (Wallowa terrane, Oregon, USA) has allowed us to make the first detailed observations of its coiling, innermost structure and lamellae arrangement and to recognize mor− phological features that were either wrongly interpreted or not described in the original systematic definition of the spe− cies. In this paper, we demonstrate that the species possesses characteristics that hamper its assignment to Triasina and we propose a new genus, Aulosina, to accommodate this taxon. Placing emphasis on the accuracy of the morphological de− scription, the diagnosis and the systematic definition of the species are here improved. The identification of innovative features in Aulosina oberhauseri (strengthenings, shortened lamellae) highlights new evolutionary trends for the lineage of Involutinina that have proved useful for the establishment of phylogenetic links between involutinid genera and for un− derstanding the evolutive steps leading to the formation of inner−pillars in tubular foraminifers. The increasing complex− ity of Involutinina representatives at the end of the Triassic, notably marked by the appearance of internal structures in Triasininae, leads us to regard them as probable symbiont−bearing foraminifers.
Źródło:: Acta Palaeontologica Polonica; 2013, 58, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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