Rev. 06/15/26
Phylum Nematoda Diesing, 1861
Class Enoplea Inglis, 1983
Subclass Enoplia Pearse, 1942
Enoplida Filipjev, 1929
Trefusiina Siddiqi, 1983
Trefusioidea Gerlach, 1966
Diagnosis
Cuticle smooth or striated, except in Xennellidae De Coninck, 1965 where it is annulated.
Metanemes absent,
Amphids usually non-spiral; spiral only in a few species
Outer labial and cephalic sensilla setiform and usually positioned in two well-separated circles (6+6+4)
No cephalic capsule, except in Xennella which has a non-annulated cephalic capsule formed by thickening of body cuticle.
Buccal cavity barrel-shaped, usually without teeth
Pharynx cylindrical. conoid
Excretory system apparently absent, sometimes a pore present
Opening of pharyngeal glands unknown in most species, near buccal cavity in Trefusialaimus.
Male reproductive systems usually diorchic with two testes (monorchic in Trefusialaimus).
Female reproductive system didelphic; ovaries reflexed except in Cytolaimium exile Cobb, 1920 and Trefusialaimus idrisi where they are outstretched.
Caudal glands (when present) lie completely within the tail or position unknown
Marine nematodes mainly
Andrássy, I. 2007. Free-living Nematodes of Hungary, Vol. II. Hungarian Natural History Museum, Budapest.
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