Chromosome Studies of Pocket Gophers, Genus Thomomys. I. The Specific Status of Thomomys umbrinus (Richardson) in Arizona

Abstract

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Apparent convergence of karyotypes in two species of pocket gophers of the genus <i>Thomomys </i>(Mammalia, Rodentia)

“…We agree with Patton andDinoman (1968, 1970) that the only natural classification of these karyotypes is into biarmed and uniarmed categories, and it is on this basis that our data were analyzed. As they pointed out, such a simple classification does not show many morphological differ ences between karyotypic variants.…”

“…The specimen from Arizona with 56 acrocentrics was captured on sloping terrain with very shallow soil. Valley populations in deeper soils of the area are T. bottae with low numbers of acrocentrics (Patton and Dingman, 1968).…”

Chromosome Banding Patterns in Squirrel Monkeys (Saimiri sciureus)

“…Pericentric in versions are known to be a widespread phenomenon in many animals, in particular, a number of rodent species, e.g. Peromyscus [Hsu and Arrighi, 1968], Neotoma [Baker and Mascarello, 1969] Thomomys [Patton and Dingman, 1968], Spalax [Soldatovic et ah, 1967] and Rattus [Yosida et ah, 1965], Three chromosome type A/A, A/S and S/S (A-acrocentric, S-submeta-or subtelocentric), were found in squirrel monkeys involving chromosome pairs B5 and Bll with Cl and C2. Similar polymorphic types were also reported in other animals such as Rattus rattus [Yosida et al, 1971], The types varied in animals according to geographic ori gin.…”

Karyotypic Variation in the Pocket Mouse,Perognathus PenicillatusWoodhouse (Rodentia-Heteromyidae)

“…Although a majority of these cases are of a Robertsonian nature (MATTHEY 1966a(MATTHEY , 1966bMAY LAN 1964;NADLER 1964 ), several systems involving non-Robertsonian variation have also been recorded (MATTHEY 1966c;PATTON and DINGMAN 1968;Hsu and ARRIGHI 1969). It is therefore not surprising to find yet another case of intraspecific chromosomal variation.…”