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Morphology of a sterile, tetraploid, hybrid whiptail lizard (Squamata, Teiidae, Cnemidophorus). American Museum novitates ; no. 3228

Show simple item record Hardy, Laurence M. en_US Cole, Charles J. en_US 2005-10-06T16:59:26Z 2005-10-06T16:59:26Z 1998 en_US
dc.description 16 p. : ill. (some col.) ; 26 cm. en_US
dc.description Includes bibliographical references (p. 14-16). en_US
dc.description.abstract "Experimental hybridization with whiptail lizards has been conducted in order to improve understanding of the evolution of parthenogenesis in vertebrates and the effects of horizontal gene transfer in Cnemidophorus, the systematics of which has been confused owing to the reticulate phylogeny within the genus. Here we describe the external morphology and reproductive tissue histology of a sterile tetraploid hybrid between C. sonorae (triploid, unisexual) X C. tigris (diploid, bisexual), and compare her to her parents and siblings that developed from unfertilized eggs (normally cloned C. sonorae). This may help to identify F³ hybrids that are found in nature and may help to determine whether they are sterile without conducting extensive laboratory breeding programs. Considering that the maternal parent (C. sonorae) represented a clone that was of hybrid origin itself, the four genomes in the tetraploid hybrid historically were derived from three hybridization events among three bisexual species of Cnemidophorus, probably as follows: [(inornatus [female] X burti [male]) X burti [male] ] X tigris [male]. The tetraploid inherited 100% of its mother's genes and morphologically was very similar to her and her cloned offspring, particularly in scalation. Nevertheless, it was slightly larger than its siblings at hatching, grew faster than its siblings, attained a larger size, and, beginning at an age of six months, developed dorsal spots reflecting paternal traits in its color pattern. However, if this lizard had been found in nature, without any knowledge of its life history and in the absence of genetic data, it could easily have been misidentified as Cnemidophorus exsanguis, which it resembled more closely than its parental species. Although she reached adult size and lived for more than two years beyond the age at which her cloned siblings produced offspring (nine months), the tetraploid never reproduced. Her ovaries were abnormally small, had poorly defined follicular epithelium with little vascularization, and had either empty or fluid-filled follicles devoid of oocytes. She also had numerous abnormally large mesonephric tubules and few or no cilia in the median oviduct. These traits should be examined in other specimens hypothesized to be sterile F³ hybrid females"--P. 2. en_US
dc.format.extent 4625929 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3228 en_US
dc.subject.lcc QL1 .A436 no.3228, 1998 en_US
dc.subject.lcsh Cnemidophorus -- Morphology. en_US
dc.subject.lcsh Cnemidophorus -- Reproduction. en_US
dc.subject.lcsh Hybridization. en_US
dc.subject.lcsh Lizards -- Reproduction. en_US
dc.subject.lcsh Parthenogenesis in animals. en_US
dc.title Morphology of a sterile, tetraploid, hybrid whiptail lizard (Squamata, Teiidae, Cnemidophorus). American Museum novitates ; no. 3228 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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