Pseudocheironchus

Pseudocheironchus	Contents	Rev: 05/20/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Pseudocheironchus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Selachinematidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae: Selachonematinae
Pseudocheironchus Leduc, 2913

Type species of the genus: Pseudocheironchus ingluviosus Leduc, 2013

Synonyms:

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Morphology and Anatomy:

six conical inner labial papillae; six small outer labial setae and four slightly longer cephalic setae in one circle.
strong mandibles, each with two pairs of four blunt hooks, mandibles joined by a membrane with slender cuticularised ridges at their junction,
Posterior buccal cavity with three equal mandibles, one dorsal and two sub-ventrally. Each mandible consists of a heavily cuticularised axis with a longitudinal groove; anterior portion consists of two sets of four blunt hooks; posterior extremity of axis rounded.
pharynx short, with conspicuous oval-shaped anterior bulb surrounding posterior portion of buccal cavity,
nerve ring at middle of pharynx. secretory-excretory system present, cellular body of ventral gland situated 1.5 cbd posterior to pharynx, pore situated near posterior extremity of posterior pharyngeal bulb
multispiral amphideal fovea with 5.0 turns,
short conical tail with rounded end

Females:

didelphic-amphidelphic with reflexed ovaries.
Vulva located slightly pre-median.
Vaginal glands present,
Pars proximalis vaginae surrounded by constrictor muscle

Ref: Leduc, 2013

Pseudocheironchus ingluviosus A. Entire male; B. Female mandibles and cuticularized ridges. Scale Bars A = 100um; B = 20 um
Adapted from Leduc, 2013

Males:

diorchic, testes short, outstretched
spicules paired, curved
gubernaculum small
mid-ventral row of 17-19 cup-shaped pre-cloacal supplements

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

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Distribution:

Predatory marine nematodes. Recorded from bottom sediments 350 m deep off the coast of New Zealand

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Feeding:

Food Sources and Feeding strategies for the genus Pseudocheironchus

Considered voracious predators (as reflected in thee species name; ingluviosus = Latin for varacious, gluttonus).

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Biology and Ecology:

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

Predator.

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Management:

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References:

Leduc, D. 2013. Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand. European Journal of Taxonomy 63: 1-32.