Download or read book Systematics of the Melanocephala Group of the Colubrid Snake Genus Tantilla written by Larry David Wilson and published by . This book was released on 1980 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systematics of the Melanocephala Group of the Colubrid Snake Genus Tantilla Classic Reprint written by Larry David Wilson and published by Forgotten Books. This book was released on 2017-01-18 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Systematics of the Melanocephala Group of the Colubrid Snake Genus Tantilla The next step of the discrimination analysis involved examination of the material of the various color pattern types for evidence of sym patry or intergradation. No evidence of sympatry was found but evidence of intergradation was and this evidence is used in defining species limits. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Systematics of the Calamarina Group of the Colubrid Snake Genus Tantilla written by Larry David Wilson and published by . This book was released on 1974 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A R sum of the Colubrid Snakes of the Genus Tantilla of South America written by Larry David Wilson and published by . This book was released on 1987 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of the Colubrid Snakes of the Genus Tantilla of Central America written by Larry David Wilson and published by . This book was released on 1982 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snakes of the World written by Van Wallach and published by CRC Press. This book was released on 2014-04-22 with total page 1237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Snakes of the World: A Catalogue of Living and Extinct Species-the first catalogue of its kind-covers all living and fossil snakes described between 1758 and 2012, comprising 3,509 living and 274 extinct species allocated to 539 living and 112 extinct genera. Also included are 54 genera and 302 species that are dubious or invalid, resulting in reco
Download or read book Systematics of North American Colubrid Snakes Related to Tantilla Planiceps Blainville written by Charles J. Cole and published by . This book was released on 1981 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Examination of numerous characters (primarily of head coloration, hemipenes, scutellation, and size and proportions) of more than 750 specimens suggests that Tantilla planiceps, as recognized by Tanner (1966), actually represents four distinct species: Tantilla planiceps (Blainville, 1835), of southern California and Baja California; Tantilla yaquia Smith, 1942, of southeastern Arizona and northwestern Mexico; Tantilla atriceps (Günther, 1895), of southern Texas and northeastern Mexico; and Tantilla hobartsmithi Taylor, '1936' (1937), which is broadly distributed in the southwestern United States and northern Mexico and usually has been considered synonymous with T. atriceps. Synonymies, diagnoses, descriptions, illustrations, range maps, and ecological notes are presented for each of these species. Tantilla atriceps and T. hobartsmithi are sibling species with strikingly different hemipenes. They also are the only species of the complex for which sympatry (in Coahuila) has been documented. Future collecting may well demonstrate sympatry at the periphery of the ranges of T. planiceps and T. hobartsmithi and of T. yaquia and T. hobartsmithi. Analysis of variation indicates that some classical taxonomic characters used previously (e.g., number of ventral scales) are not particularly reliable for distinguishing among species of Tantilla. The best specific characters we found are in anatomy of the hemipenes. Variation in hemipenial features usually is correlated with variation in head coloration. Because T. atriceps and T. hobartsmithi are sibling species, now known to differ consistently only in hemipenial characters, and because they exhibit sympatry at the periphery of their ranges, specific identification of females is a problem that requires additional investigation. Once it appeared that male copulatory organs would provide important, diagnostic characters for the four species formerly assigned to T. planiceps, we examined hemipenes on as many specimens (258) as were reasonably available. These included pertinent type-specimens and outgroup comparisons with T. gracilis, T. nigriceps, and T. wilcoxi; hemipenes of these species are distinctive also, and examples of all are described and illustrated (excepting T. wilcoxi). One problem that remains under investigation is the specific relationship between T. atriceps and southern populations of T. nigriceps. No such problem exists between T. hobartsmithi and T. nigriceps, however, as they differ rather consistently in hemipenes and head coloration, and they are sympatric in the western part of the range of T. nigriceps. We also examined maxillary bones, sex ratio, and karyotypes (including that of T. coronata) in addition to the characters mentioned above. Most of these data are not taxonomically useful, due either to lack of significant variation or lack of comparative data from congeners. A preferred cladogram of phylogenetic relationships of T. wilcoxi, T. planiceps, T. yaquia, T. nigriceps, T. atriceps, T. hobartsmithi, and T. gracilis is presented, as is a key to all species of Tantilla known to occur in the western United States and northern Mexico. The most useful characters for distinguishing species of Tantilla, particularly in North America, appear to be in the hemipenes and head coloration. Hereafter, all taxonomic studies within Tantilla routinely should include examination of hemipenes of the specimens examined. When possible, males should be selected as type-specimens"--P. 203.
Download or read book Wildlife Review written by and published by . This book was released on 1980 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Abstracts written by U.S. Fish and Wildlife Service and published by . This book was released on 1976 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Snakes of Trinidad and Tobago written by Hans E. A. Boos and published by Texas A&M University Press. This book was released on 2001 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: As issues of employee involvement and participation once more evoke considerable controversy, this textbook provides an accessible overview of the main strands, perspectives and debates in current thinking and practice. It adopts a comparative international approach, addressing developments in the United Kingdom and mainland Europe, the United States and elsewhere. The authors identify two main strands of evolution: one driven by managerial interests in enhancing and controlling employee commitment and performance; the other deriving from employees' attempts to influence high-level organizational decision-making. In particular, they examine and analyze: the background of key concepts, issues and philosophies underpinning
Download or read book A Review of the Triviidae Mollusca Gastropoda written by Crawford Neill Cate and published by . This book was released on 1979 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systematics of North American Colubrid Snakes Related to Tantilla Planicops Blainville written by Charles J. Cole and published by . This book was released on 1981 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Serpientes de Costa Rica written by Alejandro Solórzano L. and published by Editorial INBio. This book was released on 2004 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions in Biology and Geology written by and published by . This book was released on 1980 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cryptozoology written by and published by . This book was released on 1992 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Memoirs of the San Diego Society of Natural History written by and published by . This book was released on 1976 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Occasional Papers of the Museum of Zoology written by and published by . This book was released on 1985 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
