. Biology of the Heteromyidae. Heteromyidae. '/ I r ChaziodijovLS Dipodomys Perojnalhws Fig. 3.—The external ear (PVB 654), D. merriami (MVZ 171301), and P. lon- gimembris (MVZ 171899). A, antitragus; arrow points to attachment anti-tragus found in dipod- omyines, showing absence of intertragic notch. Not drawn to scale (from Brylski, 1985). nathus and in dipodomyines. Hair mor- phology in heteromyids is species specific, but apparently is of little systematic utility above the species level (Homan and Gen- oways, 1978). Observations on the molt in Perognathus and Liomys can be fo
. Biology of the Heteromyidae. Heteromyidae. '/ I r ChaziodijovLS Dipodomys Perojnalhws Fig. 3.—The external ear (PVB 654), D. merriami (MVZ 171301), and P. lon- gimembris (MVZ 171899). A, antitragus; arrow points to attachment anti-tragus found in dipod- omyines, showing absence of intertragic notch. Not drawn to scale (from Brylski, 1985). nathus and in dipodomyines. Hair mor- phology in heteromyids is species specific, but apparently is of little systematic utility above the species level (Homan and Gen- oways, 1978). Observations on the molt in Perognathus and Liomys can be found in Speth (1969) and Genoways (1973), respectively. Hindfeet The plantar tubercles on the hindfeet of heteromyines and perognathines are re- placed in dipodomyines by a single foot pad located centrally at the base of the toes (Fig. 2). This derived feature of dipodomyines probably cushions the overlying foot bones during locomotion. The soles of the hindfeet are either naked or lightly haired in hetero- myines and perognathines and are densely haired in dipodomyines. In heteromyines, the lateral hairs of the hindtoes are sparse and point anteriorly. In perognathines they project anteriorly and laterally, resulting in a "fringe-toed" effect, which may enhance locomotor efficiency on sandy substrates. Dipodomyines are more extensively fringe- toed owing to the greater density of hair on their hindsole. External Ear The antitragus of the pinna is well de- veloped and primitive in Heteromys, Lio-. 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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