Contributions to Zoology, 70 (4) (2002)Miguel Vences; Frank Glaw; Franco Andreone; Riccardo Jesu; Giovanni Schimmenti: Systematic revision of the enigmatic Malagasy broad-headed frogs (Laurentomantis Dubois, 1980), and their phylogenetic position within the endemic mantellid radiation of Madagascar
Discussion

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Biogeography

The distribution patterns of the four Laurentomantis species as revised herein provide some information on the biogeographic regions within Madagascar defined by Angel (1942), Glaw and Vences (1994) and Raxworthy and Nussbaum (1995). The presence of M. ventrimaculatus at Isaka-Ivondro in the South-East and at Andasibe in the Central East (distance between both localities ca. 675 km) provides a further example of a species occupying a large and probably more or less continuous distribution area along the eastern rainforests. On the other hand, the sharp distribution border between M. malagasius and M. striatus is a further example of the faunal turnover between the Eastern and North-Eastern regions which at least partly takes place in the Masoala-Tsararano-Anjanaharibe corridors (Vences et al. 1999), without conspicuous recent distribution barriers. Finally, the presence of M. horridus in Sambirano (Nosy Be), the Central North (Tsaratanana) and the North (Montagne d’Ambre) emphasizes the similarities between the herpetofaunas occurring in these regions.