LONGIDORIDAE FROM SÂO TOME' AND PRÍNCIPE WITH DESCRIPTIONS OF TWO NEW SPECIES OF XIPHINEMA (NEMATODA, DORYLAIMIDA)

Abstract

A taxonomic study of the longidorid nematodes collected in the islands of São Tomé and Príncipe in the Guinea Gulf, revealed the presence of one species of Longidorus and eight species of Xiphinema. L. laevicapitatus Williams and X. longicaudatum Luc were the most common and widespread, occurring in both islands. X. brasiliense Lordello was found only in Prigrave;ncipe and X. ifacolum Luc only in São Tomé. X. setariae Luc and X. vulgare Tarjan, although less common than X. setariae, occurred both in São Tomé and Príncipe. The male of X. longicaudatum is reported for the first time. Two new species are described: X. dihysterum found in São Tomé and X. insulanum found only on the small island Das Cabras, north east of São Tomé. The first resembles X. longicaudatum from which it differs in its didelphic female reproductive system; the second is similar to X. vulgare. A ninth species is not named because only one female was found.