Halichoanolaimus brandtae

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

Chromadorea
Chromadoria
Chromadorida
Selachinematidae
Halichoanolaimus brandtae Zograf, Trebukhova & Pavlyuk, 2015

Synonyms:

Morphology and Anatomy:

Body relatively short and stout, anterior end blunt.
Cuticle with transverse rows of lateral punctations.
Amphid spiral, 35% of head diameter, near mid-length of buccal cavity, with 6.5 turns.
Inner labial sensillae 6, papilliform and hard to observe. Six outer labial sensillae and four cephalic setae situated in one circle, short. Outer labial sensillae twice length of cephalic setae.
Body covered with sparse somatic setae.
Buccal cavity typical for genus, consisting of two parts: a wide anterior and a narrowed posterior part.Buccal cavity 15% of pharynx length. About ten denticles in a set at the border of anterior and posterior parts of the buccal cavity; each set subdivided into two parts by a tooth like structure.
Anterior equipped with mandibles
Pharynx cylindrical. .
Intestine blind, no rectum or anus,

Ref: Zograf et al., 2015

	Females: Didelphic, amphidelphic, ovary branches reflexed. Vagina straight, without cuticularizations, surrounded by single sphincter muscle. Vulva at 50% of body length Anus and rectum absent.
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, Five precloacal supplements, Spicules paired, arcuate, 1.9 cbd long. Gubernaculum without apophyses, 1.1 c.b.d. long. Tail anterior conoid (25%) and posterior cylindrical (75%) parts' 4.7 cbd long; a few somatic setae on the cylindrical part. Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Predatory marine nematodes. Recorded from bottom sediments between 200 and 500m deep off the coast of Sweden.

Feeding:

Predatory: intestinal contents observed include undigested remains (spicules and gubernacula) or partially digested entire bodies of a variety of nematode species,

Biology and Ecology:

Spicules of ingested nematode prey sometimes fround in posterior of blind intestine (Zograf et al., 2015).

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

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