Setostephanolaimus Tchesunov, 1994

Holovachov, Oleksandr, 2014, Swedish Plectida (Nematoda). Part 7. Setostephanolaimus tchesunovi sp. n. from the west coast of Sweden, Zootaxa 3847 (4), pp. 576-582 : 580

Setostephanolaimus Tchesunov, 1994

Diagnosis (emended after Holovachov & Boström 2010). Cuticle annulated, annules smooth, without ornamentation. Lateral alae absent. Body pores present. Somatic setae present, not connected to epidermal glands. Labial region continuous with body contour, lips basally fused. First annulus posterior to cephalic sensilla bases, sometimes posterior to amphids, weak cephalic capsule present. Inner labial sensilla indistinct. Outer labial sensilla setiform, located on anterior surface of lips. Cephalic sensilla setiform; their bases located anterior to amphids. Subcephalic sensilla present in some species, located anterior to amphid. Cervical sensilla can be present in some species, located posterior to amphid. Amphidial fovea round, transverse oval slit or reniform, difficult to discern in some species. Secretory-excretory system: renette cell located along ventral side of anterior part of intestine; excretory pore located at or posterior to nerve ring; excretory canal short, excretory ampulla present. Buccal cavity funnel-shaped: cheilostom undifferentiated; gymnostom undifferentiated; stegostom funnel-shaped, undifferentiated, with weakly sclerotised walls. Radial tubes absent. Pharynx cylindrical anteriorly, muscularized; gradually widening posteriorly into a glandular expansion with sometimes irregular shape; dorsal gland sector in strongly developed in some species; pharynx without valves and muscular bulbs. Cardia partly embedded in intestine. Female reproductive system didelphic, amphidelphic or monodelphic, opisthodelphic; ovary branch(-es) reflexed antidromously; spermatheca axial; vulva preequatorial or equatorial; vagina straight, pars proximalis vaginae encircled by a single sphincter muscle; pars refringens vaginae absent. Male reproductive system monorchic; spicules arcuate, with ovoid manubrium and subcylindrical or long cylindrical shaft; gubernaculum plate-like, with or without apophysis. Copulatory apparatus: 6–26 tubular supplements; single midventral precloacal sensillum; 0–3 postcloacal sensilla. Tail conoid. Three caudal glands present, their nuclei are incaudal. Spinneret functional, in some species large and strongly cuticularised.

Type species.

Setostephanolaimus gandavensis ( Jensen, 1976) Tchesunov, 1994 = Stephanolaimus gandavensis Jensen, 1976