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Description of two new and one known species of the closely related genera Cruznema Artigas, 1927 and Rhabpanus Massey, 1971 (Nematoda: Rhabditidae) with a discussion on their relationships

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A new and a known species of Cruznema and a new species of the closely related Rhabpanus are described and illustrated. Cruznema helalii sp. n. is characterised by medium- to large-sized, robust individuals (L = 0.75-1.21 mm), punctate cuticle, sudden narrowing of body posterior to vulva, uterus with embryonating eggs, cuticularised and angular vulval lips, a pair of lateral cuticular flaps extending from anterior vulval lip up to anal opening, rounded peloderan, half-closed bursa and eight pairs of genital papillae in 2/2 + (P + 4) or 2/2 + (P + 3) + 1 configuration with precloacal papillae anteriorly directed. Cruznema tripartitum, the most commonly occurring species, is redescribed. Rhabpanus uniquus sp. n. is characterised by medium-sized, plump females (L = 0.61-0.63 mm, a = 11.0-11.2), punctate cuticle, six lateral lines, sexual dimorphism in lip region, anisomorphic metastegostom, presence of short post-uterine sac, a short conoid tail with small terminal spike, male with spicules having distinctly bilobed capitula and phasmids at level of GP6.

Affiliations: 1: Nematode Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh-202002, India


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