Number of Pages: 2Integrative BiologyGeological Science

Lynch, James F.

Wake, David B.

English

Number of Pages: 2Integrative BiologyEarth and Planetary Science

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P AMPHIBIA: CAUDATA: PLETHODONTIDAE PSEUDOEURYCEA UNGUIDENTIS Catalogue of American Amphibians and Reptiles. Lynch, J.F. and D.B. Wake. 1999. Pseudoeurycea unguidentis. Pseudoeurycea unguidentis (Taylor) Bolitoglossa unguiden~isTaylor 1941 57 .  Type locality, "Cerro San Felipe, about 15 kilometers north of Oaxaca, Oaxaca [MCxico], at an elevation of about 2200 meters in mixed for- est containing much pine." Holotype, Field Museum of Natural History (FMNH) 10001 1 (formerly EHT-HMS 17102). adult male, collected by E.H. Taylor, 20August 1938 (not examined by authors). Pseudoeurycea unguidentis: Taylor 1944:209. CONTENT. No subspecies are recognized. DEFINITION. Compared with other species in the genus, Pseudoeurycea unguidentis is moderately large (maximum SVL = 62 mm) and has a very long tail (tail length exceeds SVL in adults), long limbs (combined limb IengtMSVL > 1.0). large hands and feet, and a narrow head. Males tend to exceed fe- males in SVL, but have relatively narrower heads and longer limbs, and possess bifid premaxillary teeth. Compared with adults, juveniles have shorter relative tail length and broader heads. The background color of the dorsum is medium gray, grad- ing to pale gray laterally. The middorsal region tends to be P mottled brown and gray, but lacks a distinctly delineated mid- dorsal stripe. The sides usually are marked with irregular patches of white iridophores. The belly and undersurface of the tail are a uniform pale gray; the chin is white and flecked with tiny melanophores. DIAGNOSIS. The only species with which Pseudoeurycea unguidentis is likely to be confused is the sympat~ic F! smithi. Compared with the latter, F! unguidentis is smaller and more gracile, has a relatively longer tail, longer limbs, and a narrower head. The two species are profoundly differentiated genetically (Lynch et al. 1977). DESCRIPTIONS. Taylor ( 1  94 1 ) described external morphol- ogy, dentition, and color pattern. Lynch et al. (1977) presented morphological and electrophoretic data for P. unguidentis and P. smithi. ILLUSTRATIONS. Taylor (1941) illustrated the head, pre- maxillary teeth, and feet of the holotype. Lynch et al. (1977) included a photograph of a living specimen. MAP. Distribution of Pseudoeur.vcea unguidenris. The circle repre- sents the type locality and other known localities in close proximity to the type locality. DISTRIBUTION. The only sites where Pseudoerirycen unguidentis is known to occur are at high elevations (2,900- 3,050 m) in mixed oak-conifer forest on Cerro San Felipe and adjacent Cerro San Luis, about 15 km north of the city of Oaxaca. Taylor (1941) reported the elevation of the type locality near the summit of Cerro San Felipe as 2,200 m, but we believe this to be in error, as the summit of this mountain is over 3,000 m. Moreover, P. smithi, which Taylor collected in sympatry with the type series of P. unguidentis, is not known to occur below about 2,800 m. Although some individuals of Pseudoeurycea unguidentis have been collected on the ground under logs and rocks, the species is most often encountered in crevices beneath the loose bark of downed logs. The sympatric P. smithi is larger and more robust than the relatively gracile F! unguidentis, and is usually terrestrial. Other salamander species that co-occur with P. ringuidentis include F! bellii, Thorius narisovalis, and an un- named species of the Chiropterotriton chiropterus group (Darda 1994). FOSSIL RECORD. None. FIGURE. Adult male P.reudoeurycea ung~~identis (from Lynch et al. 1977). t PERTINENT LITERATURE. Taylor (1941) and Lynch et al. (1977) presented morphological data. Lynch et al. (1977) and Maxson and Wake (1981) provided biochemical compari- sons wit11 P. smithi and other Pseudoeurycea. Wake et al. (1992) illustrated the elevational distribution and general habitat asso- ciations of P. unguidentis and other salamanders of northern Oaxaca. ETYMOLOGY. The specific name unguidentis combines the Latin words for "claw" and "tooth," and refers to the hooked premaxillary teeth of adult males. COMMENT. Data presented by Lynch et al. (1977) uneq~~ivo- cally invalidated Bogert's (1967) decision to synonymize F! unguidentis and F! smithii. LITERATURE CITED Bogert, C.M. 1967. New salamanders of the plethodontid genus Pseudo- eurycea from the Sierra Madre del Sur of Mexico. Amer. Mus. Nov. (23 14): 1-27. Darda, D.M. 1994. Allozyme variation and morphological evolution among Mexican salamanders of the genus Chiropterotriton (Caudata: Plethodontidae). Herpetologica 50: 164-1 87. Lynch, J.F., S.Y. Yang, and T.J. Papenfuss. 1977. Studies of neotropical salamanders of the genus Pseudoeurycea, I: systematic status of Pseudoeurycea unguidentis. Herpetologica 33:46-52. Maxson, L.R. and D.B. Wake. 1981. Albumin evolotion and its phylo- genetic implications in the plethodontid salamander genera Pseudo- eurycea and Chiropterotriton. Herpetologica 37:109-117. Taylor, E.H. 1941. New plethodont salamanders from Mexico. Herpeto- logica 2:57-65. -. 1944. The genera of plethodont salamanders in Mexico, Pt.1. Univ. Kansas Sci. Bull  .30: 189-232. Wake, D.B., T.J. Papenfuss, and J.F. Lynch. 1992. Distribution of sala- manders along elevational transects in Mexico and Guatemala. Ti~lane Stud. Zool. Bot., Suppl. Publ. (1):303-319. James F. Lynch, Smithsonian Environmental Research Center, Edgewater, MD 21037, USA (deceased), and David B. Wake, Museum of Vertebrate Zoology, University of California, Ber- keley, CA 94720-3 160, USA. Primary editor for this account, Harold A. Dundee Published 30 August 1999 and Copyright O 1999 by the Soci- ety for the Study of Amphibians and Reptiles. 

Pseudoeurycea unguidentis

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Pseudoeurycea unguidentis

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