Subfamily Oxystomininae Chitwood, 1935

Diagnosis (modified from Smol et al. 2014)

Only dorsolateral orthometanemes, ventral gland when present confined within pharyngeal region. Amphideal fovea and aperture variable but amphideal aperture never elongated, precloacal supplements (when present) papilliform, in single ventral row. Females monodelphic-opisthodelphic.

Type genus

Oxystomina Filipjev, 1918

Other valid genera

Litinium Cobb, 1920

Nemanema Cobb, 1920

Thalassoalaimus de Man, 1893

Wieseria Gerlach, 1956