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Print version ISSN 0001-3765On-line version ISSN 1678-2690


VANZOLINI, Paulo Emilio. On the geographical differentiation of Gymnodactylus geckoides Spix, 1825 (Sauria, Gekkonidae): speciation in the Brasilian caatingas. An. Acad. Bras. Ciênc. [online]. 2004, vol.76, n.4, pp.663-698. ISSN 0001-3765.

The specific concept of G. geckoides was initially ascertained based on a topotypical sample from Salvador, Bahia. Geographic differentiation was studied through the analysis of two meristic characters (tubercles in a paramedian row and fourth toe lamellae) and color pattern of 327 specimens from 23 localities. It is shown that the population from the southernmost locality, Mucugê, is markedly divergent in all characters studied. A Holocene refuge model is proposed to explain the pattern. A decision about the rank to be attributed to the Mucugê population is deferred until more detailed sampling is effected and molecular methods are applied.

Keywords : speciation; Holocene refuges; lizards [ecology]; lizards [systematics].

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