Aztlanolagus Sp

REFERRED MATERIAL CM 63679; UCMP 164256, 164257, 164260, 164355, 164356, 164379, 164389, 164390, 164416164420, 164451, 164452, 164461-164464, 164490, 164491, 164498, 164499, 164520, 164539, 164540, 164544, 164545, 164555-164567, 164584, 164585, 164596, 164597, 164599, 164602.

DESCRIPTION AND COMMENTS Assignment to Aztlano-lagus required a p3 characterized by a deep anterior internal reentrant, anterior external reentrant, posterior internal reentrant, and posterior external reentrant, as well as a prominent anterior reentrant, as figured by Winkler and Tomida (1988) and White (1991a, 1991b). Mandibles of small to intermediate size that lacked p3, but exhibited molars with a highly crenulated anterior enamel band on the talonid, also were referred to Aztlanolagus, as were isolated lower molars with the highly crenulated anterior enamel band on the talonid.

BRACHYLAGUS COLORADENSIS RAMOS, 1999

REFERRED MATERIAL CM 63666, 63670, 63671, 63677, 63694, 65146, 65486, 65604, 66120, 66405, 66408, 66409, 66431, 66432, 66603, 66604; UCMP 158150, 164044-164046, 164062, 164068-164071, 164096-164102, 164141, 164193, 164194-164198, 164259, 164261, 164262, 164352-164354, 164377, 164409, 164465, 164466, 164468, 164482, 164521.

description and comments Brachylagus coloradensis is relatively easy to recognize based on its diminutive size and simple P2 (with only one deep anterior reentrant) and p3 (with no anterior reentrant and a posterior external reentrant that commonly extends less than 75% of the width of the tooth). P2s and p3s that featured characteristics deemed diagnostic by Ramos (1999) were therefore referred to B. coloradensis. Very small (e.g., those in the smallest 5% of the sample size range) leporine teeth and edentulous jaws and maxillaries were assumed to belong to B. coloradoensis by their strati-graphic association with the diagnostic teeth, since no other diminutive leporines are known from the deposits.

LEPORINAE SP.

REFERRED MATERIAL CM 63607-63614, 63616-63663, 63665, 63667-63669, 63672, 63674-63676, 63678, 63680, 63681-63683, 63685-63687, 63689, 63690, 63693, 6369563700, 65025-65035, 65192, 65194, 65216, 65313-65315, 65485, 65592-65594, 65605, 65606, 66399, 66401-66404, 66425-66430, 66463, 66464, 66600, 66601; UCMP 164004164012, 164014-164017, 164020, 164025-164031, 164033164042, 164053-164056, 164058-164061, 164063-164067, 164072-164095, 164103-164129, 164131-164140, 164143164192, 164200, 164204-164223, 164225-164255, 164268164351, 164359, 164360-164374, 164380-164387, 164391164408, 164410-164414, 164421-164449, 164453-164460, 164469-164481, 164483-164489, 164492-164497, 164500, 164501-164508, 164510-164515, 164517-164519, 164522164538, 164541-164543, 164546-164554, 164557-164566, 164568-164572, 164623-164625.

DESCRIPTION AND COMMENTS All specimens of lep-orines that fell within the upper 95% of the sample size range and that could not be directly associated with a p3 were given the designation "Leporinae sp." It is likely that some of these specimens represent Lepus, some Sylvilagus, and some Aztlano-lagus, but at present there is no reliable way to differentiate this nondiagnostic material.

LEPORIDAE, SPECIES INDETERMINATE

REFERRED MATERIAL UCMP 164574-164583, 164586164594, 164598, 164600, 164601, 164603.

DESCRI PTION AND COMMENTS Teeth that were clearly leporid but that exhibited none of the diagnostic traits noted previously are listed in this category.

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