Lagomorphs from the Zia Sand Miocene of New Mexico. American Museum novitates ; no. 2608

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New York, N.Y. : American Museum of Natural History
"Lagomorphs of ?latest Arikareean-medial Hemingfordian faunas from the Zia Sand include at least two archaeolagine leporids and an ochotonid. The latest Arikareean or earliest Hemingfordian Standing rock local fauna includes Archaeolagus cf. macrocephalus, tentatively referred to A. macrocephalus, of the early Hemingfordian of South Dakota, on morphology of lower teeth; it resembles Hypolagus in size and crenulation of hypostriae, but differs sufficiently in morphology of anterior premolars to make close relationship unlikely. Limb structure, although far advanced over Palaeolagus, suggests less cursorial locomotion than Sylvilagus or Oryctolagus. Archaeolagus sp., of the medial Hemingfordian Blick local fauna, appears less advanced than A. cf. macrocephalus in structure of upper cheek teeth. It is similar to some specimens from medial Hemingfordian rocks of Nebraska, and may also be related to Panolax of the early Pliocene of New Mexico. Fragmentary specimens from the Jeep and Mesa Prospect local faunas can be identified only as Archaeolagus incertae sedis. Oreolagus cf. nebrascensis, of the Blick local fauna, is represented by a fragmentary lower jaw and associated partial innominate bone. The latter shows some resemblance to Prolagus in form of a acetabulum and iliac blade, but also resembles Palaeolagus, especially in form of the large, high iliac tubercle, suggesting retention of primitive lagomorph morphology and relatively unspecialized mode of locomotion"--P. [1].
15 p. : ill. ; 26 cm.
Includes bibliographical references (p. 15).