A new water snake from Mexico, with notes on anal plates and apical pits in Natrix and Thamnophis. American Museum novitates ; no. 2060

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dc.contributor.authorConant, Roger, 1909-en_US
dc.date.accessioned2005-10-06T17:01:39Z
dc.date.available2005-10-06T17:01:39Z
dc.date.issued1961en_US
dc.description22 p. : ill. ; 24 cm.en_US
dc.descriptionIncludes bibliographical references (p. 21-22).en_US
dc.description.abstract"A new striped race of the Mexican west coast water snake, which bears a remarkable resemblance to a garter snake (Thamnophis), is diagnosed and described as Natrix valida thamnophisoides. Populations of this form are the only members of the species complex known to occur at fairly high elevations. Their distribution is compared with the ranges of the lowland populations, and intergradation between thamnophisoides and subspecies valida is discussed. It is shown that paired apical pits occur on the dorsal scales, especially of the nuchal region, in many Thamnophis, thus refuting the statement of several authorities that such pits are absent in all garter snakes. It is also shown that pits may be absent in some water snakes, especially in the Natrix valida complex. The condition of the anal plate, whether single or divided, although widely used in keys for the separation of the genera Natrix and Thamnophis, also varies, at least in a few species"--P. 20-21.en_US
dc.format.extent2465560 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/3433
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, N.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 2060en_US
dc.subject.lccQL1 .A436 no.2060, 1961en_US
dc.subject.lcshNatrix valida thamnophisoidesen_US
dc.subject.lcshSnakes -- Mexico -- Nayariten_US
dc.subject.lcshReptiles -- Mexico -- Nayariten_US
dc.subject.lcshNerodia -- Anatomy.en_US
dc.subject.lcshGarter snakes -- Anatomy.en_US
dc.subject.lcshColubridae -- North America -- Identification.en_US
dc.subject.lcshSnakes -- North America -- Identification.en_US
dc.subject.lcshReptiles -- North America -- Identification.en_US
dc.titleA new water snake from Mexico, with notes on anal plates and apical pits in Natrix and Thamnophis. American Museum novitates ; no. 2060en_US
dc.title.alternativeWater snakeen_US
dc.typetexten_US

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