Parasphaerolaimus Ditlevsen 1918

Genus Parasphaerolaimus Ditlevsen, 1918 Diagnosis (according to Fonseca & Bezerra 2014, Cavalcanti & Venekey 2017 and Tchesunov et al. 2024). Cuticle transversely striated or annulated. Six outer labial setiform sensilla and four cephalic setae arranged in a common circle, with cephalic setae longer than labial ones. Eight groups of subcephalic setae occur in all four juvenile stages as well as in the adults. Buccal cavity wide, barrel-shaped, within cheilostoma, the longitudinally striated truncated compartment longer than the shagreen band. Narrow granular shagreen band often consisting of six elements; circular crest may be developed. Gymnostoma narrow, with three cuticular elements. Stegostoma voluminous, conical. Amphideal fovea sexual dimorphism in size, at the level of gymnostoma or stegostoma. Ventral gland present, opening behind nerve ring. Males with one or two testes. Females with an anterior ovary on the left or right side of intestine. Oviparity or ovoviviparity.