. Biology of the Heteromyidae. Heteromyidae. mt pa 1 mm hy I pr endl hyd ecld prd. msid end Fig. 4. —Primitive eomyid crown pattern seen in Adjidaumo minutus. 4A. Upper cheek teeth, AMNH 5390, left side reversed. 4B. Lower cheek teeth, AMNH 5363, right side reversed. Cedar Creek, Logan Co., Colorado; Orellan. Anterior is to the right. Blackened wear surfaces tilt to- ward bottom of page, white toward top; stippled area is flat. Abbreviations: ac, anterior cingulum; acd, anterior cingulid; ecld, ectolophid; end, en- toconid; endL endoloph; hy, hypocone; hyd, hy- poconid; hys, hypostyle; hysd, h
. Biology of the Heteromyidae. Heteromyidae. mt pa 1 mm hy I pr endl hyd ecld prd. msid end Fig. 4. —Primitive eomyid crown pattern seen in Adjidaumo minutus. 4A. Upper cheek teeth, AMNH 5390, left side reversed. 4B. Lower cheek teeth, AMNH 5363, right side reversed. Cedar Creek, Logan Co., Colorado; Orellan. Anterior is to the right. Blackened wear surfaces tilt to- ward bottom of page, white toward top; stippled area is flat. Abbreviations: ac, anterior cingulum; acd, anterior cingulid; ecld, ectolophid; end, en- toconid; endL endoloph; hy, hypocone; hyd, hy- poconid; hys, hypostyle; hysd, hypostylid; msl, mesostyle; msld, mesostylid; mt, metacone; mtd, metaconid; pa, paracone; pc, posterior cingulum; pod, posterior cingulid; pr, protocone; prd, pro- toconid; prs, protostyle; prsd, protostylid. anterior and posterior cingulids and lack the ectolophid that is typical of eomyids. As drawn in their fig. 1, however, the buccal cusps appear to be worn to a low, flat plane. The buccal stylids of geomyoids are lacking. The genus is certainly not a heteromyid. The late Eocene genus Griphomys Wilson, 1940, has also been suggested (Wilson, 1949c) as a structural stage in the origin of the geomyoid crown pattern; its crown pat- tern is already bilophodont. Wahlert (1976) described the lower dentition of Jimomys in which the difference in height between Ungual and buccal parts of the teeth is slight and decreases as the teeth are evened by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brown, James H; Genoways, Hugh H. [Stillwater, Okla. ?] : American Society of Mammalogists
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