Download or read book Systematic Status of the Colubrid Snake Leptodeira discolor G nther written by William Edward Duellman and published by Good Press. This book was released on 2021-04-25 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report pertains to the author's re-analysis of a previously discovered snake species, which was thought to belong to either the genera Leptodeira or Hypsiglena. After further study, the author determined that the species cannot be categorized to either genus, and should instead be grouped under an entirely new one named Tantalophis.

Download or read book Systematic Status of the Colubrid Snake Leptodeira Discolor G nther written by William Edward Duellman and published by . This book was released on 1958 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Systematic Status of the Colubrid Snake Leptodeira Discolor G nther Classic Reprint written by William E. Duellman and published by . This book was released on 2016-06-27 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Systematic Status of the Colubrid Snake, Leptodeira Discolor Gunther Size and Proportions - Head and body 312 mm. Long; tail 118 mm., amount ing to per cent of length Of head and body. 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 A Monographic Study of the Colubrid Snake Genus Leptodeira written by William Edward Duellman and published by . This book was released on 1958 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The genus Leptodeira Fitzinger, 1843, includes as absolute synonyms the generic names Megalops Hallowell, 1861, Anoplophallus Cope, 1893, and Pseudoleptodeira Taylor, 1938. Nine species comprise the genus; five of these are monotypic; one embraces five subspecies, one includes four subspecies, and two others each contain three subspecies, making a total of 20 forms. Two subspecies are described as new in this paper. The genus is characterized by maxillary teeth that increase in size posteriorly followed by a diastema and two enlarged, grooved fangs. There are two apical pits, elliptical pupil, divided anal, smooth dorsal scales, normal complement of colubrid head shields, and a capitate hemipenis with many large spines. Four species groups are separated on the nature of the hemipenes, the dentition and certain skull elements, particularly the quadrates, vomers, and maxillaries. Analysis of the characters shows that the most useful in a systematic study of the snakes are the numbers of ventrals, caudals, and dorsal scale rows, the numbers of upper labials and preocular scales, the number, shape, and size of the body blotches, and the nature of the dorsal head pattern. Analysis of numerous character clines shows that parallel clines may exist in two or more species in certain characters, but that in others the clines may diverge. Discontinuous clines are common. In some cases these are correlated with striking morphological changes between populations and become incorporated in the characteristics of subspecies. Studies of the skull of Leptodeira indicate that the skull is a normal colubrid type without striking specializations. Certain skeletal elements readily identify it from related genera. The poison glands (modified posterior portions of parotid glands) are large and produce a venom of sufficient strength to kill small frogs and lizards. The distribution of the genus is essentially throughout the American tropics to elevations of about 2000 meters. Some forms are restricted to semi-arid habitats; others live in tropical rain forest. Two species range from semi-arid to wet forest environments; each has a subspecies adapted to arboreal life in the forest by having a reduced number of dorsal scale rows, enlarged vertebral and paravertebral scale rows, and a laterally compressed body. Snakes of this genus feed primarily on frogs and toads; some lizards are included in the diet. The snakes are nocturnal and appear to reach their greatest abundance at times of congregations of breeding frogs. So far as is known, all species are oviparous and may lay as many as 13 eggs. On penial characters Leptodeira may be placed with Hypsiglena and Trimorphodon as a subgroup of colubrine snakes. If Leptodeira is related to Trimorphodon, they must have diverged early in their evolutionary history. Hypsiglena and Leptodeira are closely related and evolved from a common ancestral stock. The African snakes of the genus Crotaphopeltis that have been placed in the genus Leptodeira represent a separate evolutionary line of colubrine snakes. Based on the Cenozoic history of tropical America, studies of the morphology and distribution of the snakes, and the fossil record of other animals, the evolutionary history of Leptodeira has been reconstructed. This shows that Leptodeira and Hypsiglena underwent generic differentiation from a common ancestral stock in southern México during the early Miocene. By middle Miocene time the groups of Leptodeira had diverged. The present distribution and differentiation are a result of the effects of sea portals across Middle America that isolated populations often for long periods of time, and the Cenozoic orogenies that changed the uniform climatic conditions of Middle America and produced arid as well as humid habitats"--P. 143.

Download or read book Variation and Relationships of the Colubrid Snake Leptodeira Frenata written by William Edward Duellman and published by . This book was released on 1955 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monographic Study of the Colubrid Snake Genus Leptodeira Bulletin of the AMNH V 114 Article 1 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Analysis of Variation Within Some Mexican Taxa of the Colubrid Snake Genus Leptodeira written by Bernard E. Willard and published by . This book was released on 1978 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nomenclatural Status of the Neotropical Subspecies of the Colubrid Snake THAMNOPHIS SAURITUS written by Douglas Athon Rossman and published by . This book was released on 1961 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Systematic Division and Evolution of the Colubrid Snake Genus Natrix written by Edmond V. Malnate and published by . This book was released on 1960 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smuggled written by Raymond Terrence Hoser and published by C. Pierson Publishers. This book was released on 1993 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reptilia and Batrachia written by George Albert Boulenger and published by . This book was released on 1890 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Fauna of British India including Ceylon and Burma written by Malcolm A. Smith and published by . This book was released on 1935 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Field Naturalist written by and published by . This book was released on 1833 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: