New kangaroo mice, genus Microdipodops (Rodentia: Heteromyidae) from Idaho and Nevada

Publication Type:

Journal Article


Proceedings of the Biological Society of Washington, The Biological Society of Washington, Volume 98, Issue 1, p.1-9 (1985)

Call Number:




Microdipodops megacephalus atrirelictus, Microdipodops pallidus restrictus


Two new subspecies of kangaroo mice (Microdipodops) are described from the Great Basin region of North America: M. megacephalus atrirelictus from southwestern Idaho and M. pallidus restrictus from southwestern Nevada. The single known population of atrirelictus is isolated from other populations of kangaroo mice by over 100 km of unsuitable habitat and constitutes the first record of the genus in the state. This taxon is large in most cranial and external measurements, extremely dark in dorsal pelage color, and is characterized by the 40-β (40 chromosomes, totally biarmed autosomes) karyotype. The subspecies restrictus, known only from the type-locality, is small in most cranial characters and has the 42-α (5 pairs of acrocentric autosomes) karyotype. This new subspecies of M. pallidus exhibits a karyotype similar to M. p. pallidus, and a morphology like that of M. p. ruficollaris. Moreover, both subspecies described herein show a level of biochemical differentiation that is in accord with their high degree of morphological and chromosomal distinctiveness.


Reference Code: A85HAF01IDUS

Full Citation: Hafner, J. C. 1985. New kangaroo mice, genus Microdipodops (Rodentia: Heteromyidae) from Idaho and Nevada. Proceedings of the Biological Society of Washington 98(1): 1-9.