Acanthostega (meaning "spiny roof") is an extinct genus of stem-tetrapod, among the first vertebrate animals to have recognizable limbs. It appeared in...
12 KB (1,367 words) - 22:35, 14 July 2024
evolved in the Devonian, including the Late Devonian-age Ichthyostega and Acanthostega, as well as the trackmakers of the Middle Devonian-age Zachelmie trackways...
104 KB (10,592 words) - 17:52, 1 October 2024
defining changes on the basis of anatomy of Ichthyostega, Tulerpeton, and Acanthostega. In the cranium, there is a stapes derived from the hyomandibular of...
20 KB (2,761 words) - 07:00, 19 January 2022
fin was not as deep as in Acanthostega, and would have been less useful for swimming. Ichthyostega is related to Acanthostega gunnari, which is also from...
16 KB (1,348 words) - 22:35, 6 October 2024
Ventastega is more primitive than other Devonian tetrapodomorphs including Acanthostega and Ichthyostega, and helps further understanding of the fish-tetrapod...
24 KB (2,477 words) - 13:29, 10 September 2024
group, the earliest limbed tetrapodomorphs such as Ichthyostega and Acanthostega, which evolved in the Devonian period long before the origin of the crown...
15 KB (989 words) - 17:31, 17 August 2024
the transition to the Carboniferous. Ichthyostegalia Acanthostegidae Acanthostega Crassigyrinidae Crassigyrinus Densignathidae Densignathus Elginerpetontidae...
11 KB (1,210 words) - 19:19, 21 September 2024
the species that existed during this transition, such as Tiktaalik and Acanthostega. Many of these species were also the first to develop adaptations suited...
15 KB (1,973 words) - 09:49, 21 September 2024
lobe-finned fish (like Gooloogongia and Eusthenopteron) and tetrapods (like Acanthostega). The pelvis was much larger than in other fish, nearly the same size...
58 KB (6,023 words) - 20:58, 27 September 2024
Russia at a site named Andreyevka. This genus and the closely related Acanthostega and Ichthyostega represent the earliest tetrapods. Tulerpeton is considered...
9 KB (1,088 words) - 19:51, 29 February 2024
polydactyly. Polydactyly in early tetrapod aquatic animals, such as in Acanthostega gunnari (Jarvik 1952), one of an increasing number of genera of stem-tetrapods...
17 KB (1,932 words) - 20:00, 5 August 2024
colleagues showed that the very earliest tetrapods, animals similar to Acanthostega, were wholly aquatic and quite unsuited to life on land. This is in contrast...
67 KB (7,973 words) - 00:48, 14 August 2024
specially rich, with some of the early tetrapods such as the Devonian Acanthostega and Ichthyostega, and unique triassic animals such as the phytosaur Mystriosuchus...
179 KB (16,910 words) - 00:23, 16 October 2024
ἄκανθα (ákantha). Meaning: spine. Examples: Acanthodes ("spiny base"); Acanthostega ("spine roof"); coelacanth ("hollow spine"); Acrocanthosaurus ("high-spined...
41 KB (3,829 words) - 12:30, 4 July 2024
upstream of the coding sequence of Shh." Devonian taxa were polydactylous. Acanthostega had eight digits on both the hindlimbs and forelimbs. Ichthyostega, which...
9 KB (993 words) - 12:15, 6 September 2024
Acanthostega, a fish-like early labyrinthodont....
78 KB (7,094 words) - 10:26, 16 October 2024
vegetation would have lowered oxygen content. The earliest forms, such as Acanthostega, had vertebrae and limbs quite unsuited to life on land. This is in contrast...
68 KB (7,456 words) - 23:58, 22 August 2024
compared to other Devonian limbed vertebrates such as Ichthyostega and Acanthostega. The cleithrum (upper blade of the shoulder) is fused to the scapulocoracoid...
29 KB (3,305 words) - 15:16, 14 October 2024
to one that was deeper. However, in 1987, nearly complete fossils of Acanthostega from about 363 Ma showed that this Late Devonian transitional animal...
234 KB (22,717 words) - 18:26, 17 October 2024
"These possibly transitional fossils have been much studied, among them Acanthostega, which seems to have been wholly aquatic, and Ichthyostega" Richard Dawkins...
87 KB (3,541 words) - 18:12, 15 October 2024
natural state of affairs in the very first tetrapods. Early groups like Acanthostega had eight digits, while the more derived Ichthyostega had seven digits...
16 KB (1,926 words) - 05:03, 27 September 2024
skull roofing bones with stem tetrapoda forms such as Ichthyostega and Acanthostega. Eusthenopteron, like other tetrapodomorph fishes, had internal nostrils...
10 KB (854 words) - 18:38, 12 August 2024
it up onto land; and Early tetrapods in weed-filled swamps, such as Acanthostega which had feet with eight digits and Ichthyostega with limbs. Descendants...
73 KB (6,345 words) - 03:13, 16 October 2024
suggested to be a transitional species between fish and tetrapods. 365 Ma Acanthostega is one of the earliest vertebrates capable of walking. 363 Ma By the...
85 KB (4,733 words) - 00:11, 13 September 2024
included: Eusthenopteron, Dunkleosteus (identified as a placoderm), Acanthostega, Hyneria, Pederpes, Dinocephalian, Gorgonops, Diictodon (fossil), and...
5 KB (451 words) - 18:39, 22 May 2024
known from fossils 380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, known from fossils about 365 million years old. Its...
53 KB (5,701 words) - 23:36, 13 August 2024
†Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega †Jakubsonia †Metaxygnathus †Parmastega †Sinostega †Tiktaalik? †Tulerpeton...
14 KB (1,345 words) - 02:41, 27 August 2024
to one that was deeper. However, in 1987, nearly complete fossils of Acanthostega from about 363 Ma showed that this Late Devonian transitional animal...
120 KB (6,285 words) - 12:20, 14 October 2024