FIG. 4 in Two new pocket mice (Mammalia, Rodentia, Heteromyidae) from the Miocene of Nebraska and New Mexico and the early evolution of the subfamily Perognathinae

FIG. 4. — Cranium and upper molars of Mioperognathus willari n. sp. (FAM 129674) (holotype): A-C, photographs (left) and line diagrams of the cranium; A, dorsal view; B, ventral view; C, right lateral view (zygomatic arch removed); D, right M1(broken)-M3 (stereo pair; anterior toward top). Abbreviations: bu, buccinator foramen; fm, foramen magnum; fo, foramen ovale; in, incisive foramen; ju, jugular foramen; mbf, fissure medial to bulla; msc, masticatory foramen; op, optic foramen; pom, posterior maxillary foramen; ppl, posterior palatine foramen; spl, sphenopalatine foramen; spt, spheopterygoid canal; spv, sphenofrontal vacuity; rp, rostral perforation (including infraorbital foramen); st, stapedial foramen; sty, stylomastoid foramen; t, temporal foramen; uaf, unossified area between alisphenoid and frontal bones; uml, unossified area between maxillary and lacrimal bones; vf, venous foramen. Scale bars: A-C, 1 cm, D, 1 mm.