Chromadoridae (Chromadorida: Nematoda) from the Indian Ocean: description of new and known species

Seventeen new and known species of the family Chromadoridae are described. The genus Dichromadora is represented by five species. Dichromadora longicaudata sp.n. is characterised by a slender body and thin long tail; Dichromadora gathuai sp.n. is characterised by a blunt anterior end, a raised lateral alae and a gubernaculum that is serrated on the posterior end; D. loiseae sp.n. is characterised by a blunt anterior end with a raised collar, double bulb, spicules with a poorly developed capitulum and seven pre-cloacal supplements; D. cucullata, Lorenzen, 1973 is characterised by lateral differentiation of two (four?) longitudinal rows of dots, seven pre-cloacal supplements and spicules with a rounded capitulum that is open at the tip; D. quadripapillata sp.n. is characterised by a cylindrical body with an elongate tail end, two (four?) longitudinal rows of dots, anterior pharyngeal region with two pairs of setae, spicules with poorly developed capitulum and four (1+3) pre-cloacal supplements. Hypodontolaimus genus has two species. Hypodontolaimus marleenae sp. n. has shore (2 mu m long) outer labial and long (18 mu m long) cephalic sensilla; punctated cuticle with two longitudinal rows of dots, spicules with poorly developed capitulum and eight fine pre-cloacal supplements; Hypodontolaimus aff: angelae Inglis, 1961 is characterised by three somatic setae at the anterior pharyngeal region, a large hollow dorsal tooth, a well-developed posterior pharyngeal bulb and a beak-shaped capitulum. The genus Ptycholaimellus has three species. Ptycholaimellus macrodentatus Timm, 1961 is characterised by a blunt anterior end, papilliform outer labial and setiform (6-8 mu m long) cephalic sensilla, spicules bent at the anterior end and a short stout gubernaculum that is sharp-pointed and hooked on the posterior end; Ptycholamellus penninae sp.n. is characterised by a blunt anterior end, inconspicuous labial sensilla and 5 mu m long cephalic sensilla, a curved spicules with poorly developed capitulum and a gubernaculum that is serrated on the posterior tip; Ptycholaimellus ponticus Filipjev, 1922 is characterised by blunt anterior end, poorly developed vestibulum, inconspicuous labial sensilla and 3 mu m long cephalic sensilla, curved spicules with poorly developed capitulum and a simple gubernaculum. Ptycholaimellus ponticus sensu Gerlach, 1951 is given a new name, P. jenseni sp, n. The genus Trochamus Boucher and Bovee, 1971 is represented by four species. Trochamus bulbosa sp. n. is characterised by a small plump body normally thicker at the mid-body especially in gravid females, annulated and punctated cuticle with a lateral differentiation that is a raised ala, prominent labial rugae, long, slender spicules and conical cylindrical tail. Trochamus complexus Boucher, 1976 is characterised by cylindrical body swollen at the middle, annulated and punctated cuticle with a raised lateral alae, faint circular amphids, small stoma, thin slender spicules and elongate cylindrical tail. Trochamus prosoporus Blome, 1985 is characterised by rather long body (> I mm long), with a blunt anterior end and cylindrical tail end, raised lateral alae, stoma with a large dorsal tooth, curved massive spicules and a gubernaculum with sharp posterior tip. Trochamus polki sp. n. is characterised by cylindrical body with a blunt anterior end and cylindrical tail end, raised lateral alae, prominent labial rugae, open loop-shaped amphids and in female the vagina wall is very refractive. Prochromadorella Mickoletzy, 1924 has two species. Prochromadorella daroae sp, n. is characterised by a slender body attenuating on both ends, heterogeneous cuticle without lateral differentiation, curved spicules with a poorly developed capitulum and no pre-cloacal supplements. Prochromadorella ditlevseni (de Man, 1922), Lorenzen, 1971 is characterised by a slender body, heterogeneous cuticle without lateral differentiation, thin curved spicules and five pre-cloacal supplements. The genus Trichromadora Kreis, 1929 is re-instated and T. longicaudata Kreis, 1929 is redescribed. It is characterised by a slender body and a long tail, cuticle with lateral differentiation of three longitudinal rows of dots throughout the body length, massive spicules with a poorly developed capitulum and five pre-cloacal supplements