, Volume 346, Issue 1–3, pp 59–76 | Cite as

Acantholaimus (chromadoridae:nematoda) from the Indian Ocean: description of seven species

  • Agnes W. Muthumbi
  • Magda Vincx


Seven species of the Acantholaimus aredescribed. Acantholaimus vermeuleni sp.n. ischaracterised by labial and cephalic sensilla thatare located at the same level, two post amphidialsetae on the dorso-lateral side and a poorlydeveloped stoma without distinct teeth. Acantholaimus verscheldi sp.n. is characterised bya narrow elongate pharyngeal region, a long stomawith distinct teeth and short (4–7 µm) cephalicsensilla. Acantholaimus heipi sp.n. ischaracterised by a narrow elongate pharyngealregion, well developed teeth in the stoma and longcephalic sensilla (11–13 µm). Acantholaimuselegans Jensen 1988 has a narrow anteriorpharyngeal region that increases in lengthposteriorly, it has setae before and after theamphids on both sides and stoma with well developedteeth. Acantholaimus gathumai sp.n. ischaracterised by long cephalic (10–15 µm) andsomatic (8–10 µm) setae and lateraldifferentiation with fine dots (5–7 µm inwidth). Acantholaimus geraerti sp.n. has longcephalic sensilla (15–19 µm) and narrow (4–6 µm)distinct lateral differentiation. Acantholaimusinvaginatum sp.n. is characterised byvery long cephalic setae (16–21 µm), severalsetae at the pharyngeal region and wide lateraldifferentiation with fine dots, often the stoma isinvaginated.

Distribution of the different species of Acantholaimus encoutered in the four transectsstudied is also described.


Indian Ocean Lateral Differentiation Pharyngeal Region Cephalic Seta Distinct Tooth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Dinet, A. & M. H. Vivier, 1979. Le méiobenthos Abyssal du Gulfe de Gascogne. II Les peuplements de nématodes et leur diversité specifique. Cah. Biol. mar. 20: 109–123.Google Scholar
  2. Gerlach, S. A., M. Shrage & F. Riemann, 1979. Die Gattung Acantholaimus(Nematoda, Chromadoridae), und Beobachtungen über einen mutmaßlichen Transportmechanimus für Spermien bei A. calathussp.n. In Veröff, Inst. Meeresforschung Bremerhaven 18: 35–67.Google Scholar
  3. Gourbault, N. & M. Vincx, 1985. Nématodes abyssaux du campagne Walda du NØ‘Jean Charcot’. VI. Le genre Acantholaimus: espèces nouvelles et étude de l'appareil reproducteur a spermatozoides géants. Bull. Mus. natn. Hist. nat. Paris 4e ser 7: 611–632.Google Scholar
  4. Jensen, P., 1988. Four new nematode species abundant in the deep-sea benthos of the Norwegian Sea. Sarsia 73: 149–155.Google Scholar
  5. Jensen, P., 1988a. Nematode assemblages in the deep-sea benthos of the Norwegian Sea. Deep-Sea Res. 35: 1173–1184.Google Scholar
  6. Muthumbi, A. W., K. Soetaert & M. Vincx, 1997. Deep-sea nematodes from the Indian Ocean: new and known species of the family Comesomatidae. Hydrobiologia 346: 25–57.Google Scholar
  7. Soetaert, K. & C. Heip, 1990. Sample-size dependence of diversity indices and the determination of sufficient sample size in a high-diversity deep-sea enviroment. Mar. Ecol. Prog. Ser. 59: 305–307.Google Scholar
  8. Soetaert, K. & C. Heip, 1995. Nematode assemblages of deep-sea and shelf break sites of the North Atlantic and the Mediterranean Sea. Mar. Ecol. Prog. Ser. 125: 171–183.Google Scholar
  9. Thistle, D. & K. M. Sherman, 1985. The nematode fauna of a deep-sea site exposed to strong near-bottom currents. Deep-Sea Res. 32: 1077–1088.Google Scholar
  10. Tietjen, J. H., 1976. Distribution and species diversity of deep-sea nematodes off North Carolina. Deep-Sea Res. 23: 755–768.Google Scholar
  11. Tietjen, J. H., 1984. Distribution and species diversity of deep-sea nematodes in the Venezuela Basin. Deep-Sea Res. 31: 119–132.Google Scholar
  12. Tietjen, J. H., 1989. Ecology of deep-sea nematodes from the Puerto Rico Trench area and Hatteras Abyssal Plain. Deep-Sea Res. 36: 1579–1594.Google Scholar
  13. Vivier, M. H., 1985. Espèces du genre Acantholaimus(Nematoda, Chromadoridae, Spilipherinae). Peuplements profonds du golfe de Gascogne L. Laubier & Cl. Monniot (eds). Ifremer: 331–349.Google Scholar

Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Agnes W. Muthumbi
    • 1
    • 2
  • Magda Vincx
    • 1
    • 2
  1. 1.Department of Morphology, Systematics & Ecology, Marine Biology SectionUniversity of GentGentBelgium
  2. 2.Kenya Marine & Fisheries Research InstituteMombasaKenya

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