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The retina of Psammodynastes pulverulentus (Boie, 1827) and Telescopus fallax (Fleischmann, 1831) with a discussion of their phylogenetic significance (Colubroidea, Serpentes)

2009; Wiley; Volume: 28; Issue: 4 Linguagem: Inglês

10.1111/j.1439-0469.1990.tb00381.x

1439-0469

Jens Bødtker Rasmussen,

Bat Biology and Ecology Studies

Journal of Zoological Systematics and Evolutionary ResearchVolume 28, Issue 4 p. 269-276 The retina of Psammodynastes pulverulentus (Boie, 1827) and Telescopus fallax (Fleischmann, 1831) with a discussion of their phylogenetic significance (Colubroidea, Serpentes) J. B. Rasmussen, Corresponding Author J. B. Rasmussen Zoological Museum, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, DenmarkSearch for more papers by this author J. B. Rasmussen, Corresponding Author J. B. Rasmussen Zoological Museum, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, DenmarkSearch for more papers by this author First published: December 1990 https://doi.org/10.1111/j.1439-0469.1990.tb00381.xCitations: 8AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract The retinas of the rear-faned snakes Psammodynastes pulverulentus and Telescopus fallax have been examined. P.pulverulentus has a simplex retina in which the proportion between the numbers of outer and inner nuclear layers is 1:8 which means that P.pulverulentus has a typical diurnal retina. This is further stressed by the find of a shallow, temporal fovea until now only known from a single snake genus, Ahaetulla. T. fallax has a two-tier retina with double cones, with almost the same numbers of outer and inner nuclear layers (1:1.3) which means that T.fallax has a typical nocturnal retina. - The two species are usually regarded as belonging to the boigine (s. str.) snakes, but the presence of double cones in both species and not least the presence of a retinal fovea in Psammodynastes, makes this assignment dubious, and their probable relationships to other Colubroids are discussed. Citing Literature Volume28, Issue4December 1990Pages 269-276 RelatedInformation