DESCRIPTION OF XIPHINEMA-SILVESI N-SP FROM PORTUGAL (NEMATODA, LONGIDORIDAE)

Xiphinema silvesi n. sp. is described and figured. Specimens were reco vered from the rhizosphere of broad beans (Vicia faba L.) growing at Q uinta do Rogelo, Silves, Portugal. The new species is characterized by females with two genital branches equally developed, a differentiated pseudo-Z-organ, and a short conical tail with subdigitate terminus. X . silvesi n. sp. most closely resembles X. malawiense Brown, Luc & Sah a, 1983 and X. belmontense Roca & Pereira, 1992. It differs from the f irst species in having a more slender body, a shorter odontophore, and by differences in the position of the guiding ring, the number of inc lusions bodies in the pseudo-Z organ, and the shape of the lip region. It differs from the second species in having a shorter body and odont ophore and by absence of small spiniform structures inside the uteri a nd rarity of males. X. silvesi n. sp. is also similar to X. coxi europ aeum Sturhan, 1985, X. dissimile Roca, Pereira & Lamberti, 1988, X. di versicaudatum (Micoletzky, 1927) Thorne, 1939, and X. pseudocoxi Sturh an, 1985, but differs from these species by several morphological and morphometrical characters. (C) Orstom/Elsevier, Paris.