Halaphanolaimus		Contents		Rev: 06/05/2024
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Halaphanolaimus Menu				Ecosystem Functions and Services
		Distribution		Management
Return to Leptolaimidae Menu		Feeding		References
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Classification:

Chromadorea

  Chromadoria

       Plectida

Leptolaimoidea

Leptolaimidae

        Halaphanolaimus Southern, 1914

 

      Considered a synonym of Leptolaimus (Holovachov and Bostrom, 2004

    Synonyms:
     

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Morphology and Anatomy:

Adapted from original description by Southern (1914):

• Cuticle coarsely striated cuticle.
• Head small, offset with posterior circular groove and single ring of four submedian hairs.
• Amphids are simple spirals.
• Esophagus narrow with posterior bulb. Lateral line linear, without structure.
• Spicules paired, with simple accessory pieces.
• A variable number of ventral tubular precloacal supplements extending anteriorly to the esophageal region.

Halaphanolaimus resembles Leptolaimus in general appearance, males always having tubular precloacal supplements, elongated and cuticularised stoma, and simple spiral or circular amphids.  The genus is distinguished from Leptolaimus by having the precloacal supplements extending to the esophageal  region (Platt & Warwick, 1988; Urkmez and Brennan, 2013).

Key to species of Halaphanolaimus  (adapted from Urkmez and Brennan, 2013)

1a Number of precloacal supplements 6 or more . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -

1b Number of precloacal supplements below 6 . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 3

2a  6-7 precloacal supplements, body length 1.4-1.5 mm, .spicule length 47-52 um diameter of labial region 8 um, a=33-41, b=6.0-6.6, c=10.7-12.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H. pellucidus Southern, 1914

2b 12-14 precloacal supplements, body length 0.9-1.2 mm, spicule length 68-70 um, diameter of labial region 6 um or less, a=21-25.6, b=4.7-5.4, c=9.9-11.0 . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . . H. sergeevae Urkmez & Brennan, 2013

3a Cervical and somatic setae absent. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -

3b  Cervical and somatic setae present . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . 5

4a Spicule length 35 um, stoma length 8 um, c'=4.0-4.5 . . . . . . . . . . . . . . . .  .H. luridus Timm, 1963

4b Spicule length 16-18 um, stoma length 14-18 um, c'=5.0-8.1 . . . . . . . . . . H. cangionensis Gagarin & Thanh, 2007

5a Spicule length 27-28 um, diameter of labial region 5.5-6.0 um . . . . . . . . . . H. rivalis Gagarin & Thanh, 2007

5b Spicule length 15-16 um . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

6a  Body length 0.43 mm-0.52 mm, a=26-35, b=3.8-4.5 . . . . . . . . . . . . . . . .H. harpaga Boucher & Bovee, 1972 -

6b Body length more than 0.6 mm, a=40-45, b=5.3-6.1 . . . . . . . . . . . . . . . . .H. lorenzeni Boucher & Bovee, 1972

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Distribution:

Marine nematodes

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Feeding:

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Biology and Ecology:

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Life Cycle:

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Ecosystem Functions and Services:

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Management:

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References:

Holovachov, O. and Bostrom, S. 2004. Morphology and systematics of the superfamilies Leptolaimoidea Oerley, 1880 and Camacolaimoidea Micoletzky, 1924 (Nematoda: Plectida).  J. Nematode Morphology and Systematics 7:1-49.

Platt, H.M. and Warwick, R.M. 1988. Free-living marine nematodes. Part II. British Chromadorids. In: Synopses of the British Fauna (New Series), vol. 38, Brill, Leiden, Holland, 502 p.

 Southern, R. 1914. Nemathelmia, Kinorhyncha and Chaetognatha. Proceedings of the Royal Irısh Academy, 31, 1–80.

Urkmez, D. and Brennan, M.L. 2013. A new species of Halaphanolaimus (Nematoda: Leptolaimidae) from the southern Black Sea (Turkey) with a modified key for species identification. Zootaxa 3691:220-228.

Copyright © 1999 by Howard Ferris.
Revised: June 05, 2024.