Ichthyostega (from Greek: ἰχθῦς ikhthûs, 'fish' and Greek: στέγη stégē, 'roof') is an extinct genus of limbed tetrapodomorphs from the Late Devonian of...

and digits evolved in the Devonian, including the Late Devonian-age Ichthyostega and Acanthostega, as well as the trackmakers of the Middle Devonian-age...

first described, the order's sole member was Ichthyostega, from which the group takes its name. Ichthyostega was seen as transitional between fish and the...

more basal than Ichthyostega, it is possible that Acanthostega was actually more derived. Since Acanthostega resembles juvenile Ichthyostega and shows a lot...

primitive than other Devonian tetrapodomorphs including Acanthostega and Ichthyostega, and helps further understanding of the fish-tetrapod transition. Walter...

portion of the stem group, the earliest limbed tetrapodomorphs such as Ichthyostega and Acanthostega, which evolved in the Devonian period long before the...

(overlapping) via blade-like flanges. Imbricating ribs are also known in Ichthyostega, though in that taxon the ribs are more diverse in shape. Tiktaalik most...

raising them out of water. A 2012 study using 3D reconstructions of Ichthyostega concluded that it was incapable of typical quadrupedal gaits. The limbs...

named Andreyevka. This genus and the closely related Acanthostega and Ichthyostega represent the earliest tetrapods. Tulerpeton is considered one of the...

stem tetrapods from Greenland, Acanthostega and Ichthyostega, Ymeria is most closely related to Ichthyostega, though the single known specimen is smaller...

weight-bearing abilities compared to other Devonian limbed vertebrates such as Ichthyostega and Acanthostega. The cleithrum (upper blade of the shoulder) is fused...

(2012). "Three-dimensional limb joint mobility in the early tetrapod Ichthyostega". Nature. 486 (7404): 523–526. Bibcode:2012Natur.486..523P. doi:10.1038/nature11124...

examples of species showing transitional features have been discovered. Ichthyostega was one of the first primitive amphibians, with nostrils and more efficient...

at the back edge of the skull. In earlier fully aquatic forms such as Ichthyostega, it may have formed an open spiracle. In later terrestrial forms such...

with some of the early tetrapods such as the Devonian Acanthostega and Ichthyostega, and unique triassic animals such as the phytosaur Mystriosuchus alleroq...

Leedsichthys ("fish from Leeds"); Haikouichthys ("fish from Haikou"); Ichthyostega ("fish roof") -lania, Pronunciation: /læniːə/, Origin: Ancient Greek:...

Ichthyostega...

team discovered the remains of the Devonian tetrapods Acanthostega and Ichthyostega, following up on field notes of researchers who had collected material...

Ichthyostega...

Early groups like Acanthostega had eight digits, while the more derived Ichthyostega had seven digits, the yet-more derived Tulerpeton had six toes. Tetrapods...

among them Acanthostega, which seems to have been wholly aquatic, and Ichthyostega" Richard Dawkins 2004 The Ancestor's Tale p. 250, ISBN 0-618-00583-8...

†Ichthyostega...

similar pattern of skull roofing bones with stem tetrapoda forms such as Ichthyostega and Acanthostega. Eusthenopteron, like other tetrapodomorph fishes, had...

fins of the Eusthenopteron with the hindleg of the Devonian tetrapod Ichthyostega and embryonic humans. Bichirs are a small group of aberrant bony fish...

intermediate between the earliest Devonian terrestrial vertebrates (such as Ichthyostega), and the different groups ancestral to all modern tetrapods, such as...

Acanthostega had eight digits on both the hindlimbs and forelimbs. Ichthyostega, which was both more derived and more specialized, had seven digits on...

weed-filled swamps, such as Acanthostega which had feet with eight digits and Ichthyostega with limbs. Descendants also included pelagic lobe-finned fish such as...

Acanthostega and Ichthyostega reveal that they had different habits. Acanthostega is likely exclusive to an aquatic environment, while Ichthyostega is progressed...

380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, known from fossils about 365 million years old. Its mixture of primitive...

found in birds (except for screamers), reptiles, and the early amphibian Ichthyostega. These processes can serve to attach scapula muscles, and help to strengthen...