- Tytuł:
- A probable oligochaete from an Early Triassic Lagerstatte of the southern Cis-Urals and its evolutionary implications
- Autorzy:
-
Shcherbakov, D.E.
Timm, T.
Tzetlin, A.B.
Vinn, O.
Zhuravlev, A.Y. - Powiązania:
- https://bibliotekanauki.pl/articles/2082181.pdf
- Data publikacji:
- 2020
- Wydawca:
- Polska Akademia Nauk. Instytut Paleobiologii PAN
- Tematy:
-
Annelida
Clitellata
Oligochaeta
Mesozoic
Lagerstätte
Russia - Opis:
- Oligochaetes, despite their important role in terrestrial ecosystems and a tremendous biomass, are extremely rare fossils. The palaeontological record of these worms is restricted to some cocoons, presumable trace fossils and a few body fossils the most convincing of which are discovered in Mesozoic and Cenozoic strata. The Olenekian (Lower Triassic) siliciclastic lacustrine Petropavlovka Lagerstätte of the southern Cis-Urals yields a number of extraordinary freshwater fossils including an annelid. The segmented body with a secondary annulation of this fossil, a subtriangular prostomium, a relatively thick layered body wall and, possibly, the presence of a genital region point to its oligochaete affinities. Other fossil worms which have been ascribed to clitellates are reviewed and, with a tentative exception of two Pennsylvanian finds, affinities of any pre-Mesozoic forms to clitellate annelids are rejected. The new fossil worm allows tracing of a persuasive oligochaete record to the lowermost Mesozoic and confirms a plausibility of the origin of this annelid group in freshwater conditions.
- Źródło:
-
Acta Palaeontologica Polonica; 2020, 65, 2; 219-233
0567-7920 - Pojawia się w:
- Acta Palaeontologica Polonica
- Dostawca treści:
- Biblioteka Nauki
Artykuł