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The oldest evidence for the existence of tetrapods comes from trace fossils: tracks (footprints) and trackways found in Zachełmie, Poland, dated to the Eifelian stage of the Middle Devonian, 8] although these traces have also been interpreted as the ichnogenus Piscichnus (fish nests/feeding traces). [49]
Nine tetrapod trackways from three sites have been reported from the Valentia Slate Formation of Valentia Island, Ireland. [2] [3] The Valentia Slate Formation is composed mostly of purple coloured fine-grained sandstones and siltstones interpreted to represent a fluvial setting.
The Trachilos footprints are possibly tetrapod footprints which show hominin-like characteristics from the late Miocene on the western Crete, close to the village of Trachilos, west of Kissamos, in the Chania Prefecture. [1]
Daeschler said that trace evidence was not enough for him to modify the theory of tetrapod evolution, [10] while Shubin argued that Tiktaalik could have produced very similar footprints. [11] In a later study Shubin expressed a significantly modified opinion that some of the Zachelmie footprints, those which lacked digits, may have been made by ...
Many fossil trackways were made by dinosaurs, early tetrapods, and other quadrupeds and bipeds on land. Marine organisms also made many ancient trackways (such as the trails of trilobites and eurypterids like Hibbertopterus). Some basic fossil trackway types: footprints; tail drags; belly drag marks – (e.g., tetrapods) [5]
Footprints Tetrapod tracks, referred to Captorhinomorpha eureptiles: Example of Hyloidichnus: Moradisaurinae [5] Indeterminate Cala Gata MBCN 15730, a partial right maxilla and parts of the palate A Captorhinidan eureptile: Pachypes [1] cf.P. ollieri; Torrent de na Nadala Footprints Tetrapod tracks, referred to Pareiasauromorph parareptiles
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
The oldest types of tetrapod tail-and-footprints date back to the latter Devonian period. These vertebrate impressions have been found in Ireland, Scotland, Pennsylvania, and Australia. A sandstone slab containing the track of tetrapod, dated to 400 million years, is amongst the oldest evidence of a vertebrate walking on land. [45]