Zootaxa, Geodipsas (Squamata: Colubridae)

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Zootaxa, Geodipsas (Squamata: Colubridae) Zootaxa 1093: 61–68 (2005) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA 1093 Copyright © 2005 Magnolia Press ISSN 1175-5334 (online edition) Description of a new Geodipsas snake from northern Madagascar (Squamata: Colubridae) VINCENZO MERCURIO & FRANCO ANDREONE 1 Museo Regionale di Scienze Naturali, Via G. Giolitti, 36, I-10123, Torino, Italy; e-mails: vincenzomercurio@gmx.de and f.andreone@libero.it Abstract We describe a new species of the colubrid snake genus Geodipsas from the rainforests of the Anjanaharibe-Sud and Tsaratanana massifs, northern Madagascar. Geodipsas fatsibe n. sp. differs from the other described species of the genus in the following characteristics: 21 rows of dorsal scales at midbody, high number of ventral (198) scales and by the presence of very large hooked spines on the hemipenis. Geodipsas fatsibe is most similar to Geodipsas infralineata. Most likely they are sister species, with a vicariant northern vs. central southern distribution. Key words: Geodipsas; Colubridae; new species; Madagascar Introduction The colubrid snake genus Geodipsas Boulenger was before a recent taxonomical change the only genus shared between Africa mainland and Madagascar. Cadle (1996) in his review of the genus Geodipsas recognised five Malagasy species: G. zeny Cadle, G. boulengeri (Peracca), G. vinckei Domergue, G. infralineata (Günther), and G. laphystia Cadle. Moreover, he also quoted a possible sixth (still undescribed) species (G. “species inquirenda”) from Montagne d’Ambre (Raxworthy & Nussbaum, 1994). The species from mainland Africa, and formerly ascribed to the genus Geodipsas, were moved to the distinct genus Buhoma on the basis of the deeply bifurcate sulcus spermaticus (Ziegler et al., 1997): B. depressiceps (Werner), B. procterae (Loveridge) and B. vauerocegae (Tornier). Therefore, the species belonging to Geodipsas genus are today endemic and restricted to Madagascar. 1. Corresponding author. Accepted by S. Carranza: 13 Oct. 2005; published: 8 Dec. 2005 61.
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