Studies on the genus Sectonema Thorne, 1930 (Dorylaimida: Aporcelaimidae). Redescription of S. ventrale Thorne, 1930, the type species of the genus

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Sectonema ventrale, the type species of the genus, is redescribed on the basis of type material as well as other specimens originally examined by Thorne. Description, morphometrics and LM pictures are provided. An updated diagnosis is given and the identity of several (other than type) populations is discussed. It is characterised by its 7.09-10.42 mm long body, lip region offset by deep constriction and 25-27 μm broad, mural tooth 12-14 μm long ventrally, pharyngeal expansion occupying 68-73% of total neck length, uterus 2.5-4.2 times the corresponding body diam., pars refringens vaginae well developed, V = 48-56, female tail rounded conoid (47-71 μm, c = 117-174, c′ = 0.7-0.8), spicules 120 μm long, and eight or nine irregularly spaced ventromedian supplements with a hiatus. The nature of the stomatal protrusible structure is analysed and discussed, concluding that it is more a reduced odontostyle than a typical mural tooth, a point that should be the subject of further studies.

Nematology

International Journal of Fundamental and Applied Nematological Research

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References

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Figures

  • Sectonema ventrale Thorne, 1930 (type material, female, LM). A, C: Anterior region in median, subventral view; B, E: Same in lateral view, arrow in B pointing at subventral differentiation (thickening) of stomatal wall; D: Anterior genital branch; F: Uterine egg; G: Pharyngo-intestinal junction; H: Anterior region in superficial lateral view; I, J: Caudal region; K: Vagina. (Scale bars A-C, E, H = 10 μm; D = 200 μm; F = 100 μm; G = 50 μm; I-K = 20 μm.)

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  • Sectonema ventrale Thorne, 1930 (other material, LM). A: Female, anterior part of neck region showing comparatively thick anterior section of pharynx; B: Juvenile, anterior part of neck region showing both functional and substitution teeth; C: Female, anterior region in ventral view; D-F: Female, caudal region. (Scale bars: A, B, D-F = 20 μm; C = 10 μm.)

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  • Anterior region in median lateral view. A, B: Epacrolaimus declinatoaculeatus (Kreis, 1924) Andrássy, 2000 (= Aporcelaimus vorax Thorne & Swanger, 1936); C: Sectonema demani Altherr, 1965. Arrow in A pointing at subventral differentiation (thickening) of stomatal wall. (Scale bars = 10 μm.)

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