Thoracostomopsidae Filipjev, 1927

Vilas-Boas, Ana C., da Silva, Maria C., de Souza Alves, Orane F., de Castro, Francisco J. V. & Pinheiro-Junior, Eraldo P., 2016, A new species of Trileptium (Nematoda: Thoracostomopsidae) from Bahia, Brazil, Zoologia (e 20150043) 33 (1), pp. 1-10 : 2

Thoracostomopsidae Filipjev, 1927 (adapted from LORENZEN 1994, SMOL & COOMANS 2006, NICHOLAS 2007)

Diagnosis. Presence of three prominent lips. Setiform inner labial setae (papilliform only in Fenestrolaimus ), whereas the outer labial and cephalic setae are robust and long. Cephalic organs are usually present, situated frontally or ventrofrontally in relation to the lateral cephalic setae exhibiting a variable form. Non-spiral and small amphidial fovea located posterior to the cephalic capsule are most likely absent. The inner layer of the cuticle forms a cephalic capsule, and the pharyngeal muscles are attached to it. Conical buccal cavity is tapered with three jaws and three conical teeth associated with the base of the jaws (one dorsal and two ventrosublateral) or a long eversible spear in Thoracostomopsinae members. Only dorsolateral orthometanemes with a robust scapulus occur but without caudal filament. The endings of the epidermal glands are particularly well differentiated. Female reproductive system is didelphic-amphidelfic, with antidromously reflexed ovaries. Caudal glands can be found in the pre-caudal region.