MELOIDOGYNE DUYTSI N. SP. (NEMATODA, HETERODERIDAE), A ROOT-KNOT NEMATODE FROM DUTCH COASTAL FOREDUNES

A root-knot nematode, Meloidogyne duytsi n. sp., is described and illu strated from Elymus farctus (Viv.) Melderis from Dutch coastal foredun es. This new species is characterized by the following characters: fem ale with styler slightly curved dorsally, 13.3 mu m long, with large t ransversely ovoid knobs set off from the shaft, asymetrical perineal p attern with a relatively low dorsal arch and coarse striae, lateral li nes indistinct, and lateral wing present in most patterns, male with s tyler 19.8 mu m long, with large transversely ovoid knobs set off from the shaft, head region high and set off, labial disc slightly raised, lateral lips small, and tail conical with rounded tip, and second-sta ge juvenile 424 mu m long, with hemizonid anterior to excretory pore, tail 70.4 mu m long, tapering and slightly curved ventrally, and hyali ne tail terminus distinct, 11.3 mu m long. A previously unknown malate dehydrogenase pattern and a slow esterase isozyme band were detected. M. duytsi n. sp. was also found in mixture with M. maritima Jepson, 1 987 on Ammophila arenaria (L.) Link. (C) Orstom/Elsevier, Paris.