Theristus gelana		Contents		Rev: 04/13/2026
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Theristus Menu		Economic Importance		Ecosystem Functions and Services
		Distribution		Management
Return to Xyalidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go to Dictionary of Terminology

Classification:

Chromadorea

  Chromadoria

   Monhysterida

Monhysterina

Sphaerolaimoidea

                 Xyalidae

       Theristus gelana Warwick & Platt, 1973

    Synonyms:
     

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Morphology and Anatomy:

• Cuticle distinctly transversely striated.
• Six internally striated lips and six 2 um long labial setae. Six 16-17.5 um cephalic setae, four 14 um submedian cephalic setae and occasionally a third seta of intermediate length (16um). All three setae in these submedian groups are usually difficult to distinguish as they areclose to each other
• Somatic and cervical setae long and fine, in 8 eight files . Paired terminal setae 25-35 um.
• Buccal cavity conical, unarmed.
• Amphid situated 25 jim from the anterior, 13-14 um wide, 29-30% of body diameter. Spiral structure about 2,5 turns.
•  Esophagus without posterior bulb.
• Tail conical anteriorly, then cylindrical; 3.7-4.5 cbd long.

Ref: Warwick and Platt, 1973

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Distribution:

Described from sandy sediments on beach at Firemore Bay, Loch Ewe, Scotland.

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Economic Importance:

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Feeding:

Free-living marine nematodes. Probably epistrate microbial feeders.

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Biology and Ecology:

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Life Cycle:

Ecophysiological Parameters:

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Ecosystem Functions and Services:

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Management:

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References:

Warwick, R.M. and Platt, H.M. 1973. New and little known marine nematodes from a Scottish sandy beach.. Cahiers de Biologie Marine 14:135-158.

Copyright © 1999 by Howard Ferris.
Revised: April 13, 2026.