Browsing by Author "Gans, Carl, 1923-"
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Item Adaptations for egg eating in the snake Elaphe climacophora (Boie). American Museum novitates ; no. 1571(New York : American Museum of Natural History, 1952) Gans, Carl, 1923-; Oshima, Masamitsu, 1884-1965."This paper describes the habits and vertebral modifications for egg crushing of a species of Elaphe specialized for the eating of eggs. It is pointed out that considerable variation exists among the three specimens examined, and thus a final decision as to the cause and significance of this variation is precluded at the present time by lack of material, but a number of hypotheses are offered to explain the evolutionary significance of the vertebral modification. There are possible taxonomic implications in view of the development of similar specialization among related forms and their bearing on the status of the snakes (Dasypeltinae), now placed in a separate subfamily largely because of similar but more extreme adaptive specialization. It may be of interest to note here that preliminary investigations of the senior author show that similar specialization exists in Elaphe carinata, E. dione, and E. schrencki anomala, among Chinese species of Elaphe examined thus far. In E. carinata modification of the hypapophyses has progressed to the point of penetration of the esophagus"--P. 14-15.Item A bibliography of the herpetology of Japan. Bulletin of the AMNH ; v. 93, article 6(New York : [American Museum of Natural History], 1949) Gans, Carl, 1923-Item A check list of Recent amphisbaenians (Amphisbaenia, Reptilia). Bulletin of the AMNH ; v. 135, article 2(New York : [American Museum of Natural History], 1967) Gans, Carl, 1923-Item Chromosomes of Bipes, Mesobaena, and other amphisbaenians (Reptilia), with comments on their evolution. American Museum novitates ; no. 2869(New York, N.Y. : American Museum of Natural History, 1987) Cole, Charles J.; Gans, Carl, 1923-"Karyotypes of three amphisbaenians (Bipes tridactylus, the monotypic Mesobaena, and Amphisbaena gonavensis) are presented for the first time. The karyotypes of all three species of Bipes are compared, using new material for each species, and all published karyotypes for representatives of the Amphisbaenia (approximately 20% of the Recent species, worldwide) are reviewed. Diploid chromosome numbers vary from 25 to 50, and centric fission of macrochromosomes appears to have been a major type of karyotypic evolution in these animals. Bipes tridactylus is the only amphisbaenian known to have recognizable sex chromosomes, with a ZZ([male]):ZW([female]) system (female heterogamety)"--P. [1].Item Description and geographical variation of the South American Amphisbaena angustifrons : the southernmost amphisbaenian in the world (Reptilia, Amphisbaenia). American Museum novitates ; no. 2494(New York, N.Y. : American Museum of Natural History, 1972) Gans, Carl, 1923-; Diefenbach, Carlos Olegario da C."The species Amphisbaena angustifrons Cope is reappraised on the basis of new specimens from southern South America. Amphisbaena plumbea Gray is treated as a race of angustifrons because of the occurrence of specimens from La Pampa, Argentina, intermediate in character pattern"--P. [1].Item Notes on amphisbaenids (Amphisbaenia, Reptilia). 13, A systematic review of Anops Bell, 1833. American Museum novitates ; no. 2186(New York, N.Y. : American Museum of Natural History, 1964) Gans, Carl, 1923-; Rhodes, Charlyn.Item Notes on amphisbaenids (Amphisbaenia, Reptilia). 17, A redescription and discussion of Amphisbaena angustifrons Cope and Amphisbaena camura Cope of southern South America. American Museum novitates ; no. 2225(New York, N.Y. : American Museum of Natural History, 1965) Gans, Carl, 1923-Item Notes on amphisbaenids (Amphisbaenia, Reptilia). 5, A redefinition and a bibliography of Amphisbaena alba Linné. American Museum novitates ; no. 2105(New York, N.Y. : American Museum of Natural History, 1962) Gans, Carl, 1923-Item Notes on amphisbaenids (Amphisbaenia, Reptilia). 7, Redescription and redefinition of Amphisbaena mitchelli Procter and Amphisbaena slevini Schmidt from the middle and lower Amazon, Brazil. American Museum novitates ; no. 2127(New York, N.Y. : American Museum of Natural History, 1963) Gans, Carl, 1923-Item Notes on amphisbaenids (Amphisbaenia, Reptilia). 8, A redescription of Amphisbaena stejnegeri and the description of a new species of Amphisbaena from British Guiana. American Museum novitates ; no. 2128(New York, N.Y. : American Museum of Natural History, 1963) Gans, Carl, 1923-Item Redescription and geographic variation of Monopeltis guentheri Boulenger (Amphisbaenia, Reptilia). American Museum novitates ; no. 2464(New York, N.Y. : American Museum of Natural History, 1971) Gans, Carl, 1923-; Latifi, Mahmoud."The present paper reviews all available specimens of Monopeltis guentheri Boulenger, a form that occurs at several sites in the Congo River Basin. The study confirms that Monopeltis boulengeri Boettger is a strict synonym. Minor geographical variation is described. Most important is an ontogenetic change that produces keratinization and gradual fusion of the large cephalic shields. Only a very few juvenile specimens show two discrete shields; as individuals grow, the center of the suture fuses and finally most of it is covered by a thick layer of keratin. Specimens with an autotomized and healed tail show a distally pigmented and rounded tip which is most similar to the short (nonautotomizing) tail of some other species of the genus"--P. [1].Item Redescription of three monotypic genera of amphisbaenians from South America : Aulura Barbour, Bronia Gray, and Mesobaena Mertens. American Museum novitates ; no. 2475(New York, N.Y. : American Museum of Natural History, 1971) Gans, Carl, 1923-"Three monospecific genera of Neotropical amphisbaenids, Aulura, Bronia, and Mesobaena are redescribed, based on all known available specimens. A key to all American genera of amphisbaenians is included. Each form is considered a valid species, seemingly sufficiently discrete to justify the retention of the genus. Only for Mesobaena are sample size and field data sufficient to document geographical variation"--P. [1].Item A redescription of, and geographic variation in, Liophis miliaris Linné, the common water snake of southeastern South America. American Museum novitates ; no. 2178(New York, N.Y. : American Museum of Natural History, 1964) Gans, Carl, 1923-Item Studies on amphisbaenians (Amphisbaenia, Reptilia). 4, A review of the amphisbaenid genus Leposternon. Bulletin of the AMNH ; v. 144, article 6(New York : [American Museum of Natural History], 1971) Gans, Carl, 1923-"The present study, based on more than 800 specimens in some 40 collections and on a review of all references in the literature, reduces the more than 24 named forms of the South American amphisbaenian genus Leposternon to seven, six of these having been previously named, and the seventh thus far known from only a single specimen. The species Leposternon microcephalum occupies almost the entire generic range, whereas the remaining forms (L. infraorbitale, L. octostegum, L. polystegum, L. scutigerum, L. wuchereri) appear to be more or less sympatric to it. The single, yet unnamed individual of the seventh form stems from Goiás, within the range of L. infraorbitale. The variability of integumentary architecture is much greater in this genus than in those other amphisbaenians thus far examined. The cephalic segmentation of some of the species in particular shows remarkable local variance, and the dermal-vertebral ratio is most irregular, departing drastically from the value of two, which is almost universal in other species of the order; some local variants particularly would seem to provide raw material for several kinds of interesting supplementary studies"--P. 459.Item Studies on amphisbaenians (Amphisbaenia, Reptilia). 6, The genera Monopeltis and Dalophia in southern Africa. Bulletin of the AMNH ; v. 157, article 5(New York : American Museum of Natural History, 1976) Broadley, Donald G.; Gans, Carl, 1923-; Visser, John."The present study reviews all material of the genera Monopeltis and Dalophia from south of the river Zaire. The name Dalophia is resurrected and Tomuropeltis returned to synonymy. The taxa recognized are: M. anchietae (including quadriscutata, okavangensis, devisi), leonhardi (including vernayi), c. capensis (including decosteri), c. rhodesianus new subspecies, zambezensis, s. sphenorhynchus (including habenichti, gazei), s. mauricei new combination (including ocularis), kabindae, perplexus, remaclei, adercae, scalper (including gerardi, bulsi), vanderysti (including lujae, vilhenai, closei), luandae; D. welwitschii, angolensis, ellenbergeri, gigantea (including truncata), longicauda, pistillum (including granti, colobura, jallae, transvaalensis, mossambica, kuanyamarum), luluae new combination. Geographic variation is mapped for widely ranging forms and ontogenetic changes in cephalic keratinization are documented. The review is based on some 1500 specimens, many of them collected as part of the project. All extant types have been reexamined. The present paper also summarizes ecological information gained from collectors, and miscellaneous biological data scattered throughout the literature, and includes an analysis of stomach contents for those species well represented in the Umtali collection"--P. 315.Item Studies on amphisbaenians (Reptilia). 7, The small round-headed species (Cynisca) from western Africa. American Museum novitates ; no. 2896(New York, N.Y. : American Museum of Natural History, 1987) Gans, Carl, 1923-"The West African genus Cynisca is reviewed based upon all known specimens from museum collections and recent field collections. Specimens come from Sénégal in the west, to the Central African Republic and Gabon in the east. All existing types were reexamined, diagnoses reformulated, and a key prepared. The study indicates that the genus includes 16 species, two of which, Cynisca williamsi from Ghana and C. senegalensis from Sénégal, are here described as new. Specific diagnoses are based on segmental counts and body proportions, as well as head shield pattern and caudal specializations"--P. 2.Item Studies on amphisbaenians (Reptilia). 8, Two genera of small species from east Africa (Geocalamus and Loveridgea). American Museum novitates ; ; no. 2944.(New York, N.Y. : American Museum of Natural History, 1989) Gans, Carl, 1923-; Kraklau, David M.Item Studies on amphisbaenids (Amphisbaenia, Reptilia). 1, A taxonomic revision of the Trogonophinae, and a functional interpretation of the amphisbaenid adaptive pattern. Bulletin of the AMNH ; v. 119, article 3(New York : [American Museum of Natural History], 1960) Gans, Carl, 1923-"One. The acrodont amphisbaenids have been studied, and detailed descriptions are presented of the integument, skull and mandible, cervical vertebrae, hyoid, and shoulder girdles of four of the six species. Brief comments are made on the degree of lung reduction and nature of dermal innervation. 2. Forms recognized are (forms of which no specimens were available are marked with an asterisk, *): Trogonophis wiegmanni Kaup; Pachycalamus brevis Günther; Diplometopon zarudnyi Nikolski; Agamodon anguliceps Peters; *Agamodon compressus Mocquard; *Agamodon arabicus Anderson. 3. The subspecies A. anguliceps immaculatus Calabresi, placed in A. compressus by Loveridge (1941), is returned to its original species. 4. Reasons are presented for considering the acrodont forms as a distinct subfamily, the Trogonophinae, clearly separated from other amphisbaenids by a number of structural characters and a special mode of digging. 5. The problems encountered by burrowing species are analyzed on a theoretical basis. The theoretical analysis is tested on the basis of observations on the Florida amphisbaenid species Rhineura floridana Baird. The possible burrowing mode of the Trogonophinae is analyzed on the basis of differences from the pattern exhibited by rhineurine species"--P. 201.Item Studies on amphisbaenids (Amphisbaenia, Reptilia). 3, The small species from southern South America commonly identified as Amphisbaena darwini. Bulletin of the AMNH ; v. 134, article 3(New York : [American Museum of Natural History], 1966) Gans, Carl, 1923-Item Three new spade-snouted amphisbaenians from Angola (Amphisbaenia, Reptilia). American Museum novitates ; no. 2590(New York, N.Y. : American Museum of Natural History, 1976) Gans, Carl, 1923-"Angola has a diverse herpetofauna that includes seven species of amphisbaenians. Besides two of the generalized genus Zygaspis, there are five species of the spade-snouted genus Monopeltis, and three of the spade-snouted genus Dalophia. Two Monopeltis each from a single locality are here described as new, as is the most widely ranging species of Dalophia reported from seven localities in Angola and one in Zambia"-- P. [1].