Najash rionegrina, Apesteguia & Zaher, 2006

Palci, Alessandro, Hutchinson, Mark N., Caldwell, Michael W., Smith, Krister T. & Lee, Michael S. Y., 2020, The homologies and evolutionary reduction of the pelvis and hindlimbs in snakes, with the first report of ossified pelvic vestiges in an anomalepidid (Liotyphlops beui), Zoological Journal of the Linnean Society 188, pp. 630-652 : 635

Najash rionegrina ( Fig. 2C)

This fossil snake has the most strongly developed pelvis of any undisputed fossil or living snake. It consists of three elements: a long and dorsally bowed ilium, a similar pubis, but oriented anteroventrally and pierced by an obturator foramen near the acetabular area, and a much smaller, hatchet-shaped ischium, directed posteroventrally ( Palci et al., 2013). The hindlimb of Najash consists of at least a femur, tibia and fibula, all short but robust. The femur of Najash has a well-developed internal trochanter.