File:Pakicetus SIZE.png
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Summary
DescriptionPakicetus SIZE.png |
English: Size of the pakicetid Pakicetus, compared to a human. Brown silhouette shows Pakicetus as a terrestrial, dog-like animal is based on skeletal drawing (which in turn is a composite of different specimens published by Thewissen et.al. (2001)).[1] Green silhouette outlines an alternative restoration by John Klausmeyer (University of Michigan Exhibit Museum) of Pakicetus as an aquatic, swimming animal (measuring about 1.4 meters long).[2][3]
When Pakicetus became known to science in the early 1980s, the only known remains consisted of fragments of a skull (GSP-UM 084) and a jaw fragment with some teeth (GSP-UM 081). [4] From these remains, Pakicetus was reconstructed and suggested to represent an “amphibious stage” in whale evolution that “may still spent a significant amount of time on land”. [5] In 2001, Thewissen et.al. published additional bones referred to Pakicetus and concluded that it was a terrestrial animal.[1] Philip Gingerich have repeatedly claimed the reconstruction of Pakicetus as a terrestrial animal to be “controversial”.[2]He points out that the conclusion by Thewissen et.al. that Pakicetus was terrestrial is “based on isolated bones found in a quarry where pakicetid and land mammal bones are mixed together–circumstances unlikely to convince many skeptics”[6] and argue it was made “with little explanation”.[2] Gingerich have defended his original depiction of Pakicetus as a semiaquatic animal, based the aquatic adaptations he originally described, [6] and subsequently[2] on the basis of its hearing mechanism,[7] the ilium, [8] bone microstructure[9] and long toe bones (indicating webbed feet for swimming).[2] Gingerich have repeatedly favoured the depiction by John Klausmeyer. [2][6][3] Sources
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Source | Own work |
Author | Conty |
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Date/Time | Dimensions | User | Comment | |
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current | 00:39, 18 December 2020 | 1,216 × 990 (113 KB) | Conty | Adding "alternative" life restoration |
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Horizontal resolution | 78.74 dpc |
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Vertical resolution | 78.74 dpc |