Abstract Ilha Grande is a large continental island (total area of 19,300 ha) situated at the southern coast of the state of Rio de Janeiro, in southeast Brazil, within the Atlantic Forest Biome. Here we provide an update to the previous knowledge of the fauna of amphibians and reptiles occurring in Ilha Grande, based on primary data from our own fieldwork and on secondary data (from institutional collections and from the literature). We report the occurrence at Ilha Grande of a total of 74 species, being 34 amphibians (all of them anurans) and 40 reptiles (27 snakes, 11 lizards, one amphisbaenian and one crocodylian). Our survey added 14 species to the herpetofaunal list of Ilha Grande (three of amphibians and eleven of reptiles) and removed one species (the amphibian Cycloramphus fuliginosus) from the previous list. The data indicated that Ilha Grande houses a considerable portion of the Atlantic Forest amphibian and reptile diversity (ca. 6% and 19%, respectively, of the species occurring in this biome) together with high occurrence of species endemic to this biome plus a few amphibian species endemic to this island. Ilha Grande is thus an important reservoir of both biodiversity and endemism of amphibians and reptiles of the Atlantic Forest of Brazil, which highlights the importance of the conservation of the island and of its different habitats along the insular landscape.

Amblyomma rotundatum Koch é um carrapato partenogenético geralmente associado a répteis e anfíbios. Entretanto existem relativamente poucos estudos sobre a ocorrência de carrapatos em populações silvestres de répteis no Brasil. O objetivo deste estudo foi analisar a presença de carrapatos associados às espécies de répteis em uma comunidade na restinga de Grussaí, município de São João da Barra, Estado do Rio de Janeiro, Brasil. Foram amostradas, entre os meses de dezembro de 2010 e janeiro de 2011, 131 indivíduos pertencentes a nove espécies de répteis da ordem Squamata: lagartos Tropidurus torquatus (n = 51); Hemidactylus mabouia (n = 25), Mabuya agilis (n = 30), Mabuya macrorhyncha (n = 6), Cnemidophorus littoralis (n = 5) e Ameiva ameiva (n = 10), e serpentes Philodryas olfersii (n = 2), Oxyrhopus rhombifer (n = 1) e Micrurus corallinus (n = 1). A única espécie de carrapato encontrada associada a espécimes de répteis foi A. rotundatum, tendo sido encontrada uma fêmea adulta em um indivíduo do lagarto A. ameiva, uma ninfa em um T. torquatus e quatro ninfas em uma serpente P. olfersii. O presente estudo constitui o primeiro registro do parasitismo de A. rotundatum nos répteis T. torquatus e P. olfersii como hospedeiros. Nossos resultados sugerem que no habitat da restinga de Grussaí, A. rotundatum pode utilizar diferentes espécies de répteis para a realização do seu ciclo de vida.

Amblyomma rotundatum Koch is a parthenogenetic tick usually associated with reptiles and amphibians. However, relatively few studies on occurrences of ticks in wild reptile populations in Brazil have been produced. The aim of this study was to analyze the presence of ticks associated with reptile species in the Grussaí restinga, in the municipality of São João da Barra, state of Rio de Janeiro, Brazil. Between December 2010 and January 2011, 131 individuals belonging to nine species of reptiles of the order Squamata were sampled: the lizards Tropidurus torquatus (n = 51), Hemidactylus mabouia (n = 25), Mabuya agilis (n = 30), Mabuya macrorhyncha (n = 6), Cnemidophorus littoralis (n = 5) and Ameiva ameiva (n = 10); and the snakes Philodryas olfersii (n = 2), Oxyrhopus rhombifer (n = 1) and Micrurus corallinus (n = 1). The only tick species found to be associated with any of the reptiles sampled was A. rotundatum. One adult female was detected on one individual of the lizard A. ameiva, one nymph on one individual of the lizard T. torquatus and four nymphs on one individual of the snake P. olfersii. This study is the first record of parasitism of A. rotundatum involving the reptiles T. torquatus and P. olfersii as hosts. Our results suggest that in the Grussaí restinga habitat, A. rotundatum may use different species of reptiles to complete its life cycle.