Fauna reptiliana do norte da grande Porto Alegre, Rio Grande do Sul, Brasil

Abstract

This paper reports the preliminary results of two years of herpetogeographic studies in the region called «Grande Porto Alegre» at its northern portion. The physiognorny shows, at North, slopes of the Brazilian Bouthern Plateau, more or less forested in a general view; these: elevations gradually decrease to the South until the level of the sea to Atlantic littoral by the eastern border, ana to Rio Grande do Sul savanah, which extends to Uruguay ana Argentina. The biota is transitional from the highland prairies ana forests of the plateau to lowland prairies of the pampas. Three faunistic Provinces are included: Guarani, Pampean, ana Tupi. The most conspicuous dispersion is shown by the taxa proceeding from the plateau to savanah (Dispersion Centre Guarani); the pampe'an species occur in low percentage (Dispersion Centre Uruguay), and an inappreciable account of Tupi fauna (Dispersion Centre of «Serra do Mar»). The new records are: presence of Chironius pyrrhopogon, Hydrodynastes gigas, Bothrops neuwiedi para- naensis, Micrurus corallinus; intergradation zone 0'1 Guarani ana Pampean geographic races; ana new taxa 01 snakes, which will be described brieflly. The systematic composition presents: Chelonia, 4 (3 Chelidae, 1 Testudinidae); Bauria, 10 (1 Gekkonidae, 2 Iguanidae, 1 Anguidae, 3 Teiidae, 3 Amphisbaenidae); Serpentes, 45 (35 Colubridae, 4 Elapidae, 6 Viperidae); Crocodylia (1 Crocodylidae)