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Deep-sea nematodes from the Indian Ocean: new and known species of the family Comesomatidae
Muthumbi, A.W.; Soetaert, K.; Vincx, M. (1997). Deep-sea nematodes from the Indian Ocean: new and known species of the family Comesomatidae. Hydrobiologia 346: 25-57
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158; e-ISSN 1573-5117
Peer reviewed article  

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  • Muthumbi, A.W.
  • Soetaert, K., more
  • Vincx, M., more

    Twelve new and known species of the genera Sabatieria, Cervonema, Paramesonchium, Hopperia and Dorylaimopsis and one new genus, Kenyanema are described from the Indian Ocean and S. pisinna Vitiello, 1970 from the Mediterranean Sea. Sabatieria lucia sp. n. is characterised by short but distinct inner and setiform outer labial sensilla and long (4-5 µm or 30-33% hd) cephalic sensilla; S. conicauda Vitiello, 1970, is characterised by tiny inner and outer labial sensilla and setiform cephalic ones and short and thick cylindrical tail; Sabatieria pisinna is characterised by short inner and outer labial sensilla, setiform (3 µm long) cephalic sensilla, multispiral amphids with 3.25-3.5 turns and a tail which is conical in the anterior 2/3 and posterior 1/3 cylindrical; Cervonema tenuicauda Schuurmans Stekhoven, 1950, is characterised by anterior sensilla in two circles which are equal in length (3 µm long), multispiral amphids with 3-4 turns and located at 1.5 times hd from the anterior end, simple spicules one abd long and 6-7 fine precloacal supplements; Cervonema minutus sp. n. characterised by an extremely attenuated anterior end, spiral amphids with 4-5 turns (80-90% cbd) and short, simple spicules (0.8 abd long); Cervonema gourbaulti sp. n. characterised by long (4-5 µm) labial and cephalic sensilla, spiral amphids with 5-6 turns (73-88% cbd) and an elongate crenate terminal pharyngeal bulb; Paramesonchium mombasi sp. n. characterised by long labial (5 µm) and cephalic (21 µm) sensilla that are close together and wide amphids (80-90% cbd); Kenyanema monorchis gen. et sp. n. characterised by a head region narrower than the rest of the body, four cephalic sensilla (3 µm long) and spiral amphids with 1.5-2 turns; Hopperia indiana sp. n. characterised by shea conical anterior sensilla, arcuate spicules that have a 'velum' and a gubernaculum with a long and sharp pointed apophysis; Dorylaimopsis coomansi sp. n. characterised by long (8-10 µm) cephalic setae, cuticular punctation with lateral differention of irregularly arranged dots at the pharyngeal region and 1-3 longitudinal rows of dots posterior of the pharynx; spicules with a unique shape; Dorylaimopsis gerardi sp. n. characterised by short setiform labial and long (6-7 µm) cephalic sensilla, punctated cuticle with lateral differentiation of irregularly arranged dots at first then three or four irregularly arranged longitudinal rows at the pharyngeal and tail regions and two regularly arranged longitudinal rows of dots on the rest of the body, a conico-cylindrical tail with a distinctly swollen tip; Dorylaimopsis variabilis sp. n. is characterised by short labial and setiform cephalic sensilla (33-58% hd), multispiral amphids with three turns, cuticular punctations with lateral differentiation of three longitudinal rows at the pharyngeal and tail regions and two longitudinal rows on the rest of the body, spicules that are thin and slightly arcuate. The position of S. pisinna according to the grouping of Platt, 1985 of Sabatieria spp. is also discussed. Kenyanema monorchis represents the first monorchic species in the family.

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