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searchable PDF - Association for Mexican Cave Studies

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Crockett County: 0-9 Well. Edwards County:Devil's Sinkhole, Rocksprings. Hays County:Ezell's <strong>Cave</strong>, San Marcos; Marcia's Well, San Marcos,cave at 85 ft. depth; artesian well at fish hatchery,San Marcos. Kerr County: Stowers <strong>Cave</strong>, 13mi. NW of Hunt. Medina County: Valdina FarmsSinkhole. Real County: Bonner Fallout Shelter<strong>Cave</strong>, 5 mi. N of Leakey. Schleicher County: <strong>Cave</strong>Y, 5 mi. N of Eldorado. Uvalde County: IndianCreek <strong>Cave</strong>, 22 mi. NW of Uvalde; McNair <strong>Cave</strong>;Rambie's <strong>Cave</strong>, 2 mi. N of Uvalde. Val VerdeCounty: Diablo <strong>Cave</strong>, 15 mi. NW of Del Rio, calyxhole entrance; Four-Mile <strong>Cave</strong>, 4 mi. N of Del Rio;H.T. Miers <strong>Cave</strong>, 24 mi. N of Del Rio; Unnamedspring, ca. 20 mi. N of Del Rio, just E of Devil'sRiver; Little Diablo <strong>Cave</strong>, 1 mi. from calyx hole entranceto Diablo <strong>Cave</strong>; Slaughter Bend Springs(29°39'N, lOo o 55'W).Gnathopod development.-The gnathopod(pereopod 1) of Cirolanides has a precocious development.Fig. 5 shows, to the same scale,gnathopods from a 5.7 mm juvenile and a 13 mmadult male from the same sample. Although thejuvenile body length is only 44 % of that of theadult, the length of its propus is 82 % of that of theadult; thus the juvenile propus has grown allometricallyat nearly twice the rate of the body. In addition,the palm of the juvenile propus has 3 conspicuousnarrow teeth that are reduced to lowrounded lobes in the adult. The juvenile dactyl isslightly longer and much more slender than that ofthe adult.Precocious gnathopod development does not occurin Speocirolana. Its presence in Cirolanidessuggests a need <strong>for</strong> the juvenile to handle objectsthat a gnathopod developing isometrically could notcope with.DISCUSSIONThe occurrence of(Mexistenasellus coahila)the same speciesand a species pair(Speocirolana thermydronis and S. hardeni) in localitiesin northern Mexico and southern Texas separatedby about 300 (Speocirolana) or 400(Mexistenasellus) kID suggests the earlier existenceof continuous ranges from which fragmentation hasled to the present isolated populations. A similarhistory <strong>for</strong> the subterranean amphipod genus Mexiweckeliais discussed by Holsinger (1973).LITERATURE CITEDBenedict, J.E. 1896. Preliminary descriptions of a new genusand three new species of crustaceans from an artesian well atSan Marcos, Texas. Proc. United States Nat!. Mus.,18(1087): 615-617.BolIvar y Pieltain, C. 1950. Estudio de una Ciro/ana cavernlcolanueva de la region de Valles, San Luis POtOSI, Mexico.Ciencia, Mexico, 10:211-218.Bowman, T.E. 1964. Antra/ana lira, a new genus and species oftroglobitic cirolanid isopod from Madison <strong>Cave</strong>, Virginia.Internat!. J. Speleol., 1(1+2):231-236, pIs. 50-57.Bowman, T.E. 1982a. Speociro/ana pubens and S. endeca, newtroglobitic isopod crustaceans from Mexico (Flabellifera:Cirolanidae). Assoc. <strong>Mexican</strong> <strong>Cave</strong> Stud. Bull., 8:13-23.Bowman, T.E. 1982b. Three new stenasellid isopods fromMexico (Crustacea: Asellota). Assoc. <strong>Mexican</strong> <strong>Cave</strong> Stud.Bull., 8:25-38.Cole, G.A. 1984. Crustacea from the Bolson of CuatroCienegas, Coahuila, Mexico. J. Arizona-Nevada Acad. Sci.,19:3-12.Cole, G.A., and W.L. Minckley. 1972. Stenasellid isopod crustaceansin the Western Hemisphere -- a new genus and speciesfrom Mexico -- with a review of other North Americanfreshwater isopod genera. Proc. Bio!' Soc. Washington,84(39) :313-326.Dana, J.D. 1853. Crustacea, part II. United States ExploringExpedition, 14:689-1618.Dudich, E. 1924. Uber Prate/sonia hungarica Mehely. Zoo!'Anz.,60:151-155.Henry, J.-P., J.J. Lewis, and G. Magniez. 1986. Isopoda:Asellota: Aselloidea, Gnathostenetroidoidea, Stenetrioidea.pp. 434-464 in: L. Botosonaneau, ed., Stygofauna Mundi.Leiden: E.J. Brill, Dr. W. Backhuys. vi + 740 pp.Holsinger, J.R. 1973. Two new species of the subterraneanamphipod genus Mexiweckelia (Gammaridae) from Mexicoand Texas, with notes on the origin and distribution of thegenus. Assoc. <strong>Mexican</strong> <strong>Cave</strong> Stud .Bull, 5:1-12.This is publication No. N.S.-55 of the Texas Memorial Museum.30

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