Redescription of Pungentus pungens Thorne & Swanger, 1936 (Dorylaimida: Nordiidae), with a revised taxonomy of the genus

in Nematology
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Pungentus pungens, the type species of its genus, is re-described and illustrated on the base of type material and recently collected specimens. It is characterised by a body 1.51-2.04 mm long and comparatively slender (a = 40-54), 9-12 μm broad lip region offset by weak but perceptible constriction, odontostyle 18-23 μm long, neck 343-395 μm long, pharyngeal expansion occupying 48-57% of total neck length, uterus simple and 34-54 μm long or 0.8-1.6 corresponding body diam., V = 45-52, tail short and rounded (21-29 μm, c = 66-86, c′ = 0.8-1.1) with abundant saccate bodies, spicules 47 μm long, and ten widely spaced ventromedian supplements lacking a hiatus. An emended diagnosis is proposed for Pungentus and its separation from the most similar genera is discussed. Sixteen valid species as well as one species inquirenda and three species incertae sedis are listed. Two new synonymies are proposed: Pungentus maorium of P. silvestris, and P. minnsi of P. pungens. Pungentus mosellae is herein considered species incertae sedis. A dichotomous key to species identification and a compendium of their morphometrics are also provided.

Redescription of Pungentus pungens Thorne & Swanger, 1936 (Dorylaimida: Nordiidae), with a revised taxonomy of the genus

in Nematology

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Figures

  • View in gallery

    Pungentus pungens Thorne & Swanger, 1936. A: Anterior region in median lateral view; B: Lip region in lateral, surface view; C: Neck; D: Vagina; E: Female, entire body; F: Male, posterior body region; G: Female, posterior genital branch; H: Spicule and lateral guiding piece; I: Female, caudal region.

  • View in gallery

    Pungentus pungens Thorne & Swanger, 1936 (type material from Virginia, USA, LM). A: Female, entire; B: Male, entire; C, D: Anterior region in median lateral view; E: Female, posterior body region; F: Detail of lateral pores; G: Vagina; H-J: Female, caudal region; K: Spicules; L, M: Male, caudal region; N: Male, posterior body region. (Scale bars: A = 200 μm; B, C, H-M = 10 μm; D, G = 5 μm; E, N = 50 μm; F = 20 μm.)

  • View in gallery

    Pungentus pungens Thorne & Swanger, 1936 (Female, LM). A-E: Type material from New York, USA; F-J: Recent material from Kansas, USA; A, F: Anterior region in median lateral view; B: Pharyngo-intestinal junction; C, H: Vagina; D, E, I, J: Caudal region; G: Lip region in lateral, surface view. (Scale bars: A, B, D-F, I, J = 10 μm; C, G, H = 5 μm.)

  • View in gallery

    Pungentus pungens Thorne & Swanger, 1936 (Female, SEM). A: Lip region in lateral view; B: Lip region in ventral view; C: Vulva in ventral view; D: Lip region in frontal view; E: Caudal region in ventral view, showing the anus. (Scale bars: A, B, D = 3 μm; C = 1 μm; E = 5 μm.)

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