Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico

Part 1

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UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY

Volume 9, No. 21, pp. 539-548 January 14, 1960

Pleistocene Pocket Gophers From San Josecito Cave, Nuevo León, México

ROBERT J. RUSSELL

UNIVERSITY OF KANSAS LAWRENCE 1960

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Robert W. Wilson

Volume 9, No. 21, pp. 539-548 Published January 14, 1960

UNIVERSITY OF KANSAS Lawrence, Kansas

PRINTED IN THE STATE PRINTING PLANT TOPEKA, KANSAS 1960

28-1562

Pleistocene Pocket Gophers From San Josecito Cave, Nuevo León, México

ROBERT J. RUSSELL

Cueva de San Josecito in the province of Aramberri, near the town on Aramberri, Nuevo León, México, is at an elevation of approximately 7400 feet above sea level on the east-facing slope of the Sierra Madre Occidental in a limestone scarp. The dominant vegetation about the cave is the decidedly boreal forest association of pine and live oak. Additional information concerning the cave is provided by Miller (1943:143-144).

Animal remains recovered from San Josecito Cave are among the most important Pleistocene finds in México, and include the most extensive collection of Pleistocene geomyids. The vertebrate remains are probably late Pleistocene in age; certainly they are post-Blancan, since the genera Equus, Preptoceras, Smilodon, and Aenocyon (all Pleistocene genera) are present. According to Miller's (loc. cit.:145) extensive report on the avifauna, the bird remains from the cave are a remarkable assemblage and beautifully preserved. Most of the mammalian remains have been studied in detail, and the results of these studies have been published in a number of papers each treating specific groups. These reports provide valuable information concerning the distribution of mammals in northeastern México in the late Pleistocene, a knowledge of which is most important to an understanding of present patterns of distribution and evolution of Mexican mammals.

Cushing's (1945:182-185) report on his study of the rodents and lagomorphs includes a description of an extinct pygmy species of rabbit, Sylvilagus leonensis. He records three kinds of pocket gophers from San Josecito; Cushing was able to separate the genus Thomomys from two unidentified geomyids (loc. cit.:185). These prove to belong to the genera Cratogeomys and Heterogeomys; the materials are described below. Cushing records also larger mammals, including the antilocaprid (Stockoceros conklingi), saber-toothed cat (Smilodon), dire wolf (Aenocyon), a large oviboid (Preptoceras), and deer (loc. cit.:182).

More recently Findley (1953:633-639) has written on the remains of the family Soricidae taken from the cave, and Hooper (1952:59) has studied the bones of the genus Reithrodontomys and found them not different from those of R. megalotis that inhabits the region of the cave today. Handley (1955:48) has described a new species of plecotine bat, Corynorhinus tetralophodon, from the collection. Jones (1958:389-396) published an account of the bats of San Josecito, and described a new vampire bat, Desmodus stocki, from the cave. Jakway (1958:313-327) has reported on the lagomorphs and rodents in detail, and compared this part of the cave fauna with that of Rancho La Brea and Papago Spring Cave, Arizona. Jakway (lit. cit.:323-324) suggests that the fauna from San Josecito is late Pleistocene, probably contemporaneous with the remains from Papago Spring Cave and pre-Rancholabrean.

I thank Professor E. Raymond Hall and Dr. Robert W. Wilson for their permission to examine this material and for critical comments and advice on the manuscript. The drawings were made by Miss Lucy Remple. The specimens are a part of the collection of fossil vertebrates formerly belonging to the California Institute of Technology, but now the property of the Los Angeles County Museum. The specimens had been lent by the late Professor Chester Stock to Professor Hall and Dr. Wilson for study and report. All measurements herein are in millimeters.

#Thomomys umbrinus# (Richardson)

Material referable to Thomomys consists of a nearly complete cranium, L.A.C.M. (C.I.T.) No. 3952, with nasals, maxillary teeth, and lower parts of braincase missing and zygomata broken; four rami (unnumbered), one of which is badly broken; and two isolated molariform teeth. The skull has a sphenoidal fissure, a feature typical of the umbrinus group of Thomomys. The fossil specimens closely approximate in size the living subspecies Thomomys umbrinus analogus Goldman. Thomomys is not known from the vicinity of the cave at the present time and has not been reported from southwestern Nuevo León, even though there has been extensive collecting for pocket gophers there in recent years. To my knowledge the nearest record of occurrence of modern Thomomys is a series of Thomomys umbrinus analogus from 12 miles east of San Antonio de las Alazanas at an elevation of 9000 feet in the state of Coahuila (Baker, 1953:511), approximately 85 miles to the northwest. The fossil gophers are not from the talus of the cave floor, which is evidently of subrecent origin, but from the Pleistocene deposits below. Close resemblance to the living subspecies T. u. analogus, however, indicates that these remains are not so old as some of the other geomyid fossils from the cave.

#Cratogeomys castanops# (Baird)

Seven rami pertain to the genus Cratogeomys. All except three, L.A.C.M. (C.I.T.) Nos. 2974, 2978, and 3954, lack cheek teeth and the posterior processes are missing on most of the mandibles. No. 2974 is smaller than the other specimens, and probably is from a young individual. No. 3954 may have been fossilized at an earlier date than the other six jaws; however, it is comparable to them in size and morphology. Also present in the deposits are three limb bones of Cratogeomys castanops. One, a right humerus bearing L.A.C.M. (C.I.T.) No. 2982, is slightly larger than that of the pocket gophers living in the area now. Two tibias, L.A.C.M. (C.I.T.) Nos. 2983 and 2984, complete the material referable to this species.

Cratogeomys castanops planifrons (see Russell and Baker, 1955:607) occurs in the immediate vicinity of San Josecito today. None of the rami from the cave differs appreciably from those of the subnubilus group of Cratogeomys castanops, a group of small subspecies including planifrons, subnubilus, rubellus and peridoneus. All are small in external measurements and skull and differ markedly in this respect from the group of large subspecies (the subsimus group) that occurs farther northward in Coahuila and Nuevo León.

#Cratogeomys# sp.

A rostral part of a skull, L.A.C.M. (C.I.T.) No. 2927, is referable to the genus Cratogeomys. This fragment consists of the anterior part of the skull, including a portion of the frontals, the premaxillae, a small part of the left maxilla, and the anterior parts of the palatines. The nasals are missing, but both incisors are in place including most of the roots. The single median sulcus on the anterior face of each incisor is typical of the genus Cratogeomys. The rostrum is long (25.8), as great in length as in the largest subspecies of the subsimus group of Cratogeomys castanops (see previous account for explanation) and as long as the rostrum of Cratogeomys perotensis which is now known only from Veracruz, México. The length of the rostrum was measured from the most anterior median projection of the premaxillary to the most posterior dorsal projection of the same bone. Actually, and especially in relation to its length, the rostrum of the fossil is remarkably narrow. The breadth of the rostrum measures 10.4, which is comparable to that in the subnubilus group of small subspecies, and less than that (11.4 in the smaller adult females to 13.7 in the larger adult males) in the subsimus group of large subspecies. The breadth of rostrum in the fossil is 40.3 per cent of the length of the rostrum. In living Cratogeomys castanops (both the large and small subspecies groups, and including both females and males) the breadth of rostrum amounts to between 44.0 and 51.4 per cent of its length. The rostrum in Cratogeomys perotensis (and in other species of the merriami group) is relatively much broader than in Cratogeomys castanops. Even though the rostrum of the fossil is narrower than in Recent species of Cratogeomys, the ventral border in the area of the palatine slits is more heavily constructed than in any of the living species, and it is nearly parallel-sided rather than tapered toward the midline anteriorly. At the lateral edge of the enamel plate of the incisors there is a distinct shelf, a characteristic of the merriami group of species and a feature not well developed in Cratogeomys castanops.

I hestitate to refer this fragment to any of the living species, although I would judge it to represent a form closer to the species castanops than to the merriami group (C. perotensis). The rostrum may represent, and probably does, an undescribed and extinct species of Cratogeomys, but in my opinion it should not be given formal taxonomic status until more adequate material is available.

If the fossil is actually Cratogeomys castanops, and if the fragment is from an earlier deposit in the cave than is the material here assigned to Cratogeomys castanops, the fossil stock could be ancestral to the group of small subspecies provided there had been a trend in evolution toward smaller size. Another possibility is that a shift in geographic range of the kinds of Cratogeomys that lived in the vicinity of the cave has occurred, and that the fossil represents an evolutionary line with no close relationship to Recent species and now is extinct. Additional material is needed before the history of these species can be reconstructed with validity.

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