THE XIPHINEMA AMERICANUM - GROUP IN THE VINEYARDS OF THE DÃO AND DOURO REGIONS (PORTUGAL) WITH DESCRIPTION OF TWO NEW SPECIES (NEMATODA, DORYLAIMIDA)

Abstract

A nematode survey with the aim of determining the specific composition of the Xiphinema americanum - group in the vineyards of the Dão and Douro Regions in Portugal revealed the presence of five species. Xiphinema madeirense Brown et. al., X. duriense sp.n. and X. santos sp.n. occurred in the Dão Region and X. madeirense, X. pachtaicum (Tulaganov) Kirjanova, X. pachydermum Sturhan and X. duriense sp.n. in the Douro Region. X. duriense differs from X. opisthohysterurn Siddiqi in the higher a and c' values and in the posterior vulva and basal guiding ring; X. santos differs from X. tenuicutis Lamberti et Bleve-Zacheo in the lower c value, the higher c' value, the posterior basal guiding ring and the longer tail. It is hypothesized that X. duriense is conspecific with the X. opisthohysterum reported from Portugal in 1983 by Sturhan.