Family Nygolaimoidea

Revised 10/18/22

Nygolaimoidea Thorne, 1935

•  Nematodes of the superfamily are usually > 1 mm long.
• Cuticle smooth or with fine transverse striations.
• Lip region in general scarcely differentiated, with amalgamated lips.
• Stoma armed with a mural tooth on sub-ventral wall of pharynx.
• Anterior slender portion of the esophagus transitioning gradually into the basal expanded portion, which occupies usually about half of total esophagus length.
• Esophago-intestinal junction with three large cardiac cells.
• Female genital system didelphic, rarely mono–opisthodelphic, with the genital tract poorly developed.
• Vagina usually without sclerotized pars refringens vaginae.
• Vulva transverse, rarely longitudinal.
• Males with two testes, well-developed spicules, lateral guiding pieces, with or without gubernaculum and few ventromedian supplements.
• Tail variable in shape and size, similar in sexes.

Ref Pena-Santiago (2006).

Dorylaimid esophagi: some general chracteristics

References:

Pena-Santiago, R. 2006. Dorylaimida Part 1. Superfamilies Belondiroidea, Nygolaimoidea and Tylencholaimoidea. Pp 326-391 in  E. Abebe, István Andrássy, W. Traunspurger (eds) Freshwater Nematodes: Ecology and Taxonomy. CABI Publishing.

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