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Astomonema southwardorum sp. nov., a gutless nematode dominant in a methane seep area in the North Sea

  • M. C. Austen (a1), R. M. Warwick (a1) and K. P. Ryan (a1)

A new species of mouthless and gutless free-living marine nematode, Astomonema southwardorum sp. nov., the dominant species from a methane seep pockmark in the North Sea, is described and illustrated. The new species is distinguished by its combination of short cephalic and cervical setae, with the latter being sparsely and irregularly distributed, and also in male specimens by its arrangement of precloacal and caudal setae and its postcloacal papillae. The genus Astomonema Ott, Rieger, Rieger & Enderes, 1982, is rediagnosed. Astomonema brevicauda (Vitiello, 1971) Vidakovik & Boucher, 1987, is considered to be a species inquirenda.

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P. R. Dando et al., 1991. Ecology of a North Sea pockmark with an active methane seep. Marine Ecology Progress Series, 70, 4963.

K. Kito , 1989. A new mouthless marine nematode from Fiji. Journal of Natural History, 23, 635642.

E. S. Reynolds , 1963. The use of lead citrate at high pH as an electron opaque stain in electron microscopy. Journal of Cell Biology, 17, 208212.

A. R. Spurr , 1969. A low-viscosity epoxy resin embedding medium for electron microscopy. Journal of Ultrastucture Research, 26, 3143.

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Journal of the Marine Biological Association of the United Kingdom
  • ISSN: 0025-3154
  • EISSN: 1469-7769
  • URL: /core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom
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