, Volume 364, Issue 2–3, pp 155–167 | Cite as

Chromadoridae (Chromadorida: Nematoda) from the Indian Ocean: Difficulties in morphological identification of Actinonema Cobb, 1920 and Rhips Cobb, 1920.

  • Agnes W. Muthumbi
  • Magda Vincx


The diagnostic characteristics of ActinonemaCobb, 1920 and Rhips Cobb, 1920 are reviewed andtheir importance for genera diagnosis assessed. Threespecies of Actinonema and one species of Rhips are described. Actinonema longicaudatumSteiner, 1918 is characterised by short (2–3 µmlong) anterior sensilla, cylindrical body with arather narrow anterior end, lateral alae with inverted‘V’-patterns, wide (70–75 of cbd) double amphids andaccessory pieces composed of only the telamon which isbroad anteriorly and tapers on the posterior and along tail. Actinonema paraceltica ischaracterised by long (4–5 µm) anterior sensilla,large amphids (83–88% of cbd), lateraldifferentiation of ‘V’ pattern on each annule andaccessory pieces with telamons that have shortextensions. Actinonema smolae sp. n. ischaracterised by long and thin body, large amphidslocated close to the anterior end and six solid cones.Rhips reginae n.sp. is characterised by sixsolid cones, large (90% cbd) amphids, lateraldifferentiation of two longitudinal rows of dots anddouble jointed spicules.

Actinonema Rhips diagnosis morphological characteristics 


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  1. Blome, D., 1985. Interstitielle Fauna von Galapagos XXXV. Chromadoridae (Nematoda). Microfauna Marina 2: 271–329.Google Scholar
  2. Boucher, G., 1976. Nématodes des sables fins infralittoraux de la Pierre Noire. (Manche Occidentale) II Chromadorida. Bull. Mus. natn. Hist. nat. Zool. 352: 25–61.Google Scholar
  3. Boucher, G. & F. Bovée, 1971. Trochamus carinatusgen. et sp.n. and Adeuchromadora megamphida(Nematoda) B dix soies céphaliques de la vase Terrigène Cotière de Banyuls-Sur-Mer. Vie Milieu XXII: 231–242.Google Scholar
  4. Cobb, N. A., 1920. One hundred nemas. Contribution to the science of nematology IX: 217–343.Google Scholar
  5. Kulikov, V. V., 1993. New species of the marine free-living nematodes of the genus RhipsCobb, 1920 (Chromadorida: Chromadoridae) from the Kuril islands waters. Russian Journal of Nematology 1: 41–45.Google Scholar
  6. Lorenzen, S., 1971. Die Nematodenfauna in Verklappungsgebit fur Industrieabwasser nord-westlich von Helgoland II. Desmodorida und Chromadoridea. Zool. Anz. 187: 283–302.Google Scholar
  7. Muthumbi, A. W. N. & M. Vincx, 1998. Chromadoridae (Chromadorida: Nematoda) from the Indian Ocean: Description of new and known species. Hydrobiologia 364: 117–151.Google Scholar
  8. Pastor De Ward, C. T., 1985. Free-living marine nematodes of the Deseado River estuary (Chromadoroidea: Chromadoridae, Ethmolaimidea, Cyatholaimidae & Choniolaimidae) Santa Cruz, Argentina 5. Centro national Patagonica publ esp. 6: 1–83.Google Scholar
  9. Platt, H. M. & R. M. Warwick, 1988. In Doris M. Kermack & R. S. Banes (eds), Free-living Marine Nematodes. Part II. British Chromadorids. Synopsis of the British Fauna.Google Scholar
  10. Platt, H. M. & Z. N. Zhang, 1982. New species of marine nematodes from Loch Ewe. Scotland. Bull. Bri. Mus. nat. Hist. (Zool.) 42: 227–246.Google Scholar
  11. Wieser, W., 1954. Free-living marine nematodes. II Chromadoroidea. Report from the Lund University Chile expendition 1948–1949 10. Acta Univ. lund., N. F., Avd. 2, 50(16): 148 pp.Google Scholar

Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Agnes W. Muthumbi
    • 1
  • Magda Vincx
    • 1
  1. 1.Department of Morphology, Systematics & Ecology, Marine Biology SectionUniversity of GhentGentBelgium

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