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Az Acanthostega kihalt négylábú nemzetség, egyike az első gerinceseknek, amelyeknek felismerhető végtagjai voltak. A késő devon famenni korszakában jelent meg, mintegy 365 millió évvel ezelőtt. Anatómiailag átmenetet képezett a bojtosúszójú halak és az első szárazföldi életmódra képes négylábúak között. [1]
Acanthostega. From Wikispecies. Jump to navigation Jump to search. Acanthostega gunnari Taxonavigation [edit] Superregnum: Eukaryota Cladus: Unikonta Cladus: Opisthokonta Cladus: Holozoa Regnum: Animalia Subregnum: Eumetazoa Cladus: Bilateria Cladus: Nep ...
Acanthostega is difficult to say, but the slow growth rate of the juvenile Acanthostega suggests that final adult size may not have been much greater than the largest individuals recorded from the ...
Acanthostega gunnari (Jarvik 1952) is one of a small but increasing number of genera of stem-tetrapods known from the Upper Devonian, which are providing an expanding view of the appearance of tetrapods and the origin of limbs with digits (Coates and Clack 1990, Clack and Coates 1995, Gould 1991, Pough et al. 1996, Thomson 1993, Zimmer 1995 ...
Acanthostega. Acanthostega (có nghĩa là "mái gai") là một chi động vật bốn chân cơ sở, một trong những loài động vật có xương sống có chi dễ dàng phân biệt được. Nó xuất hiện vào thời kỳ cuối kỷ Devon ( tầng Famenne) khoảng 365 triệu năm trước, và về mặt phẫu thuật ...
25 nov. 2020 · Harvard scientists reconstruct the evolution of terrestrial movement in early tetrapods. Two Late Devonian early tetrapods — Ichthyostega and Acanthostega — coming out of the water to move on land. It’s hard to overstate how much of a game-changer it was when vertebrates first rose up from the waters and moved onshore about 390 million ...
4 sept. 2003 · a–e, Comparisons between Ichthyostega and Acanthostega to show the contrast in structure.a, b, Reconstruction of the otic region of the braincase in ventral view, with the pterygoid/epipterygoid ...
