Geosesarma

Abstract: The identities of two poorly-known species of semiterrestrial crabs of the genus Geosesarma De Man, 1892, from the Philippines, are clarified. The types of Sesarma ( Sesarma ) vicentense Rathbun, 1914 (from Luzon), and Sesarma ( Geosesarma ) rathbunae Serene, 1968 (from Panay), are examined and both species are rediagnosed with detailed figures. Comparisons with allied congeners are also provided.

Abstract: A new species of semiterrestrial highland vampire crab of the family Sesarmidae, Geosesarma larsi n. sp., is described from western Sarawak. This brings the number of Bornean Geosesarma species to 12. Geosesarma larsi n. sp. is distinguished from congeners by the structures of the carapace, third maxilliped exopod and gonopods, as well as the proportions of its ambulatory legs. The colour pattern in life is also strikingly different from allied species. Notes on its ecology are provided and conservation threats briefly discussed.

Abstract: A new species of terrestrial crab, Geosesarma notophorum (Grapsidae, Sesarminae), is described from Pulau Lingga, an island east of Sumatra, Indonesia. Geosesarma notophorum belongs to the G. malayanum group of species, but can be distinguished from congeners in having iridescent green eyes, the shape of its carapace, form of its external orbital tooth, and structure of the male first pleopod. The female is unusual in carrying the young crabs on its back.

Abstract: In Sesarma (Geosesarma) perracae Nobili, 1903 the ovigerous females live in burrows containing fresh-water into which the young are released. The larval life is greatly abbreviated and the larval stages live entirely on stored yolk. The megalopa stage is almost unrecognizable.