Un nématode galligène, #Meloidogyne duytsi$ n. sp., parasitant #Elymus farctus$ (Viv.) Melderis croissant sur les avant-dunes côtières hollandaises, est décrit et illustré. Cette nouvelle espèce est caractérisée par : femelle ayant un stylet long de 13,3 micromètres, légèrement incurvé dorasalement, boutons basaux grands et transversalement ovoïdes, bien séparés de la hampe ; empreinte périnéale asymétrique avec arche dorsale relativement basse, stries épaisses et lignes latérales indistinctes ; queue pointue. Mâle : région céphalique haute et séparée du reste du corps ; disque labial légèrement proéminent ; secteurs latéraux labiaux réduits ; queue conique à extrémité arrondie. Juvéniles de deuxième stade : longueur moyenne de 424 mircomètres ; hémizonide antéieur au pore excréteur ; queue longue de 70,4 micromètres, effilée, légèrement incurvée ventralement à partie hylaine terminale distincte et longue de 11,3 micromètres. Un profil nouveau pour la malate deshydrogénase et une bande estérasique de type lent ont été détectés. #M. duytsi$ n. sp. a également été collecté en mélange avec #M. maritima$ Jepson, 1987 sur #Ammophila areanaria$ (L.) Link. (Résumé d'auteur

Karssen, G.

van Aelst, A.

van der Putten, W.H.

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Meloidogyne duytsi n. sp. (Nematoda : Heteroderidae), a root-knot nematode from Dutch coastal foredunes

Summary -A root-mot nematode, Meloidogyne duylSi n. sp., is described and illustrated from Elymus farellls (Viv.) Melderis from Dutch coastal foredunes. This new species is characterized by the following characters: female with stylet slightly curved dorsally, 13.3 !-!m long, with large transversely ovoid mobs set off from the shaft, asymetrical perineal pattern with a relatively low dorsal arch and coarse striae, lateral lines indistinct, and lateral wing present in most patterns, male with stylet 19.8 pm long, with large transversely ovoid mobs 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-stage juvenile 424 J,lm long, with hemizonid anterior to excretory pore, tail 70.4 J,lm long, tapering and slightly curved ventrally, and hyaline ta il terminus distinct, 11.3 J,lm long. A previously unmown malate dehydrogenase pattern and a slow esterase isozyme band were detected. M. dl/y/si n. sp. was also found in mixture wit

Gerrit Karssen

Adriaan Van Aelst

Wim H Van Der Putten

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Meloidogyne duytsi n. Sp. (Nematoda: Heteroderidae), a root-knot nematode from Dutch coastal foredunes

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Meloidogyne duytsi n. sp. (Nematoda: Heteroderidae): a root-knot nematode from Dutch coastal foredunes.

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A root-knot nematode, Meloidogyne duytsi n. sp., is described and illustrated from Elymus farctus (Viv.) Melderis from Dutch coastal foredunes. This new species is characterized by the following characters: female with styler slightly curved dorsally, 13.3 mu m long, with large transversely ovoid knobs set off from the shaft, asymetrical perineal pattern with a relatively low dorsal arch and coarse striae, lateral lines indistinct, and lateral wing present in most patterns, male with styler 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-stage juvenile 424 mu m long, with hemizonid anterior to excretory pore, tail 70.4 mu m long, tapering and slightly curved ventrally, and hyaline 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, 1987 on Ammophila arenaria (L.) Link. [KEYWORDS: foredunes; Elymus farctus; Meloidogyne duytsi; morphology; root-knot nematode Arenaria l link; identification

Van Aelst, A.

Van der Putten, W.H.

Meloidogyne duytsi n. sp. (Nematoda : Heteroderidae), a root- knot nematode from Dutch coastal foredunes

Meloidogyne duytsi n. sp. (Nematoda : Heteroderidae), a root-knot nematode from Dutch coastal foredunes

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