Oxystominidae Chitwood, 1935

Leduc, Daniel & Zhao, Zeng Qi, 2021, Litinium gludi sp. nov. (Nematoda, Oxystominidae) from Kermadec Trench, Southwest Pacific Ocean, European Journal of Taxonomy 748 (1), pp. 138-154 : 141

Family Oxystominidae Chitwood, 1935

Diagnosis (emended from Smol et al. 2014)

Body elongated and very thin at anterior end. Anterior sensilla in three separate circles, second and third circles clearly separated; inner labial sensilla papilliform or setiform, outer labial sensilla usually setiform (except in some species of Litinium ), cephalic sensilla setiform. Buccal cavity narrow, tubular or funnelshaped and without teeth. Sexual dimorphism in amphid shape sometimes present. Only orthometanemes with very short caudal filaments present. Pharynx inserts into body cuticle in region of buccal cavity; however, cephalic capsule not well developed. Posterior section of pharynx with undulating outline. Females didelphic-amphidelphic with antidromously reflexed ovaries or monodelphic-opisthodelphic. Males diorchic with opposed testes or only one anterior testis. Position of caudal glands variable.