Halichoanolaimus

Halichoanolaimus	Contents	Rev: 08/23/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Halichoanolaimus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Selachinematidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae: Choniolaiminae
Halichoanolaimus de Man, 1886

Type species of the genus: Halichoanolaimus robustus (Bastian, 1865) De Man, 1886

Synonyms:

Morphology and Anatomy:

Body cylindrical, tapering to extremities
Cuticle transversely striated and evenly punctate, punctations densely arranged in transverse rows;
Amphids spiral
Buccal cavity large; anterior portion cup-shaped; posterior with denticles
Mandibles cover buccal cavity
All anterior sensilla papilloid
Pharynx muscular, cylindroid, without bulbs
Adults wthout rectum or anus
Tail conical-cylindical, distally cylindroid or filiform. Caudal glands and spinneret present

Females:

Didelphic, amphidelphic, ovaries oustretched or reflexed.

Ref: Tchesunov and Okhlopkov, 2006; Xiao and Guo, 2023; Zograf et al., 2015

Body size range for the species of this genus in the database - Click:

Halichoanolaimus brandtae A: Male; B: Female; C: Head with spiral amphid, enticles, mandibles; D: Male tail.
Scale bars: A-B = 150 um; C = 25 um; D = 50 um
Drawings from Zograf et al., 2015

Males:

Diorchic with opposed testes,
Supplements present
Gubernaculum present.

Distribution:

Predatory marine nematodes. Some specimens described from mangrove swamps in Taiwan. Others from deep sea: H japonicum from 3358 m depth in Sea of Japan.

Feeding:

Food Sources and Feeding strategies for the genus Halichoanolaimus

Predators

Spicules of ingested nematode prey sometimes fround in posterior of blind intestine (Zograf et al., 2015). Intestinal contents observed include undigested remains (spicules and gubernacula) or partially digested entire bodies of a variety of nematode species.

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

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Management:

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References:

Tchesunov, A.V. and Okhlopkov, J.R. 2006. On some selachinematid nematodes (Chromadorida: Selachinematidae) deposited in the collection of the Smithsonian National Museum of Natural History. Nematology 8:21-24.

Xiao, Y., Guo, Y. 2023. Three new free-living marine nematode species of Subsphaerolaimus Lorenzen, 1978, Halichoanolaimus de Man, 1886 and Belbolla Andrassy, 1973 from mangrove wetlands in Taiwan. Zootaxa 5631:301-322

Zograf, J., Trebukhova, Y., Pavlyuk, O. 2015. New deep-sea free-living marine nematodes from the Sea of Japan: the genera Siphonolaimus and Halichoanolaimus (Nematoda: Chromadorea) with keys to species identifications. Zootaxa 3911 (1) 63-80