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]
↑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
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