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Heterodera Spinicauda Sp. N. (Nematoda: Heteroderidae) From Mud Flats in the Netherlands, With a Key To the Species of the H. a Venae Group

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Heterodera spinicauda sp. n. (Nematoda: Heteroderidae) is described from high-lying mud flats with permanent vegetation along the Haringvliet dyke at Zuidland, Voorne Putten, Zuid Holland, Netherlands. The reed Phragmites australis (Cav.) Trin. ex Steud. (Gramineae) was the dominant plant and is considered to be the most likely host. This new Heterodera species, with its bifenestrate vulval region and short vulval slit, belongs to the H. avenae group. Within this group H. spinicauda sp. n. is unique because of: (1) an inconspicuous vulval cone, giving the initial impression that the cysts are spherical; (2) inside the vulval cone, immediately below the vulva, the presence of an obvious underbridge which in end-view appears as an irregularly lobed 'bow tie'; and (3) the sharply pointed tail of the second-stage juveniles. A key to the species of the H. avenae group is presented.

Affiliations: 1: ) Manaaki Whenua - Landcare Research N.Z., Private Bag 92170, Auckland, New Zealand; 2: ) Bedrijfslaboratorium voor Grond- en Gewasonderzoek, Mariendaal 8, 6860 AC Oosterbeek, The Netherlands; 3: ) Biologische Bundesanstalt, Toppheideweg 88, D-48161 Münster, Germany; 4: ) AFRC, IACR, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ, United Kingdom


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