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File:Eosiren remains.png

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Summary

Description
English: Drawing of skeleton of the Eocene-Oligocene dugongid Eosiren. Majority of skeleton ( vertebral column, ribs, innominate and femur) is based on E. libyca (specimen UM 101226),[1] the skull on E. imenti (holotype specimen CGM 40210)[2] and the lower jaw on E. stromeri (speciment UM 100137).[1]

Currently, the femur are the only known remains of the hindlimbs. Based on its morphology (small, but proximal and distal epiphyses are present), Zalmout and Gingerich conclude that the lower leg would have been “very reduced if present at all”.[1] They also note that Siegfried (1967) "noticed that the femur [in Eosiren] is substantially different" from specimens attributed to the genus "Halitherium", and "concluded that the hind limbs of Eosiren were functionless, but possibly retained some minor muscle movement".[1] Paleoartist Charles R. Knight (1907) drew Eosiren with external hind limbs,[3] though it has also been argued that it "lack[ed] external hind limbs".[4]

References

  1. ↑ a b c d Zalmout I.S. & Gingerich P.D. (2012), “Late Eocene sea cows (Mammalia, Sirenia) from Wadi al Hitan in the western desert of Fayum, Egypt”, University of Michigan Papers on Paleontology No. 37
  2. ↑ Domning D.P. et.al. (1994). “A New Early Oligocene Dugongid (Mammalia, Sirenia) from the Fayum Province, Egypt”. University of Michigan Papers on Paleontology No. 29 (4): p. 89-108
  3. ↑ File:Eosiren.jpg
  4. ↑ Díaz-Berenguer E, Houssaye A, Badiola A & Canudo J.I. (2020). “The Hind Limbs of Sobrarbesiren cardieli (Eocene, Northeastern Spain) and New Insights into the Locomotion Capabilities of the Quadrupedal Sirenians”, Journal of Mammalian Evolution 27: p. 649–675
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Author Conty

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Captions

Eosiren skeleton

Items portrayed in this file

depicts

Eosiren

inception

16 July 2021

media type

image/png

File history

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Date/TimeThumbnailDimensionsUserComment
current14:39, 16 July 2021Thumbnail for version as of 14:39, 16 July 20214,233 × 1,163 (831 KB)ContyLimb elements put in place, add lower jaw outline
04:51, 16 July 2021Thumbnail for version as of 04:51, 16 July 20214,233 × 906 (808 KB)ContyUploaded own work with UploadWizard
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