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GENUS Ototylomys

Author:Merriam, 1901.
Citation:Proc. Wash. Acad. Sci., 3: 561.
Type Species:Ototylomys phyllotis Merriam, 1901.
Comments:Tylomyini. Emended DefinitionóLarge-sized tylomyine rodents, pelage somber gray to grayish-brown, tail nearly naked; cranium with moderately long, tapering rostrum and flat dorsal profile; jugal absent or tiny and irregularly formed, zygomatic processes of maxillary and squamosal in contact; carotid circulation derived (character state 3 per Carleton, 1980); basihyal with large, attenuate entoglossal process, vertebral column with 14-15 thoracics and 6 lumbars (Carleton, 1980); M1 rectangular, anterocone broad and deeply bifurcate, lingual and labial conules subequal to primary cusps, M3 rectangular and resembling M2 in size and enamel configuration; three complete and five-nine incomplete transverse palatal ridges (Carleton, 1980); accessory reproductive glands with one pair of preputials, ampullaries compact and coiled, vesiculars present and highly modified (Arata, 1964; Lawlor, 1969), ductus deferens with distal ampulla (Arata, 1964; Carleton, 1980); urethral process absent (Ototylomys) or rudimentary (Tylomys), dorsal papilla absent (Hooper, 1960). ContentsóOtotylomys Merriam, 1901; Tylomys Peters, 1866. Closedly related to Tylomys according to morphological features (Carleton, 1980; Hooper, 1960; Lawlor, 1969; Merriam, 1901b) and to albumin immunological distances (Sarich, 1985).
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SPECIES phyllotis

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