. Biology of the Heteromyidae. Heteromyidae. EVOLUTIONARY MORPHOLOGY 359 DipodoTTiys £iorru^s Perogmalhus Fig. 2.—The plantar surface of the pes in three heteromyids, D. merriami (MVZ 171301), L. salvini (MVZ 171900), and P. longimembhs (MVZ 171899). Not drawn to scale (from Bryl- ski, 1985). which has been interpreted to mean that they are convergent adaptations for con- cealment (Howell, 1932). The distinctive, often species-specific, arietiform facial marks found in Dipodomys (see Grinnell, 1922) is produced by a dark line at the bases of the mystacial whiskers superimposed on an unpigmente
. Biology of the Heteromyidae. Heteromyidae. EVOLUTIONARY MORPHOLOGY 359 DipodoTTiys £iorru^s Perogmalhus Fig. 2.—The plantar surface of the pes in three heteromyids, D. merriami (MVZ 171301), L. salvini (MVZ 171900), and P. longimembhs (MVZ 171899). Not drawn to scale (from Bryl- ski, 1985). which has been interpreted to mean that they are convergent adaptations for con- cealment (Howell, 1932). The distinctive, often species-specific, arietiform facial marks found in Dipodomys (see Grinnell, 1922) is produced by a dark line at the bases of the mystacial whiskers superimposed on an unpigmented cheek region. The former character is primitive among heteromyids and the latter is derived. Some Dipodomys {D. merriami, D. deserti, D. heermani, and D. spectabilis) have a white-tipped tail, which may serve as a flag to distract pur- suing predators or as a signal in intra-spe- cific communication (Eisenberg, 1963). Heteromyid hair is similar to that of other mammals, and therefore is primitive, in having imbricate cuticular scales and com- pound medullary patterns (Roman and Genoways, 1978). The underfur, when pres- ent, is short and curly (dipodomyines lack underfur). The dorsal pelage hairs are short in Chaetodipus {X = from to mm, 8 species) and Perognathus {X = from to mm, 5 species) and long in Heteromys {X = from to mm, 6 species), Lio- mys {X = from to mm, 3 species), Microdipodops {X = from to mm, 2 species), and Dipodomys {X = from to mm, 12 species). The guard hairs have a trough along their dorsal surface in heteromyines, Chaetodipus, and P. amplus and lack a trough in the remaining Perog-. 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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