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Hydrolutos breweri , a new species of Lutosini (Orthoptera: Anostostoma tidae) from Cueva Charles Brewer (Churi-tepui, Guyana Highlands, Venezuela) is described and figured. Inhabiting aquatic environment it represents an unusual orthopteran with sternal and pleural area covered by fine microtrichia forming a plastron. Key words: Orthoptera, Anostostomatidae, Hydrolutos , aquatic, Venezuela, tepui Introduction As a typical almost wholly southern hemispheric group of orthopterans Anostostomatidae are believed to owe their distribution to the split of Gondwana (Fleming 1979; Gibbs 2006), however, a dispersal factor to some islands should be taken into account (Knapp et al. 2005; Pratt et al. 2008). The whole family, formerly included in Stenopelmatidae, has been connected with plenty of longstanding nomenclatural problems, but some of them have been resolved through examination of most of the types (Johns 1997; Gorochov 2001; Jost and Shaw 2006). In their analyses Pratt et al. (2008) found support for the monophyly of Anostostomatidae and for the close relationship with the Gryllacrididae and Stenopelmatidae. Anostostomatids occupy a variety of ecological conditions across their zoogeographical range. Their unique phylogenetic status supports a challenge for specific conservation (Gibbs 1998; Johns 2001). The South American

Hydrolutos breweri sp. n., a new aquatic Lutosini species (Orthoptera: Anostostomatidae) from Churí-tepui (Chimantá Massif, Venezuela)