Cobbionema

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

Chromadorea
Chromadoria
Chromadorida
Selachinematidae: Choniolaiminae
Cobbionema Filipjev, 1922

Type species of the genus: Cobbionema acrocerca Filipjev, 2020

Synonyms:

Morphology and Anatomy:

Body cylindrical, tapering slightly towards both extremities.
Cuticle with fine transverse striation, with transverse rows of subcuticular dots, one row per annule. Lateral differentiation absent. Lateral alae present in some species
Outer labial sensilla small papilliform, located on the periphery of labial region. Cephalic sensilla setiform. Somatic setae scattered along the body.
Amphideal fovea lateral or ventrosublateral, large, sexually dimorphic in size, multispiral with circular outline.
Anterior chamber of buccal cavity barrel-shaped or cylindrical with 6 or 12 cuticularized rhabdions, each with two pairs of large, pointed projections at posterior extremity. Posterior buccal chamber cone-shaped, with strongly cuticularized Y-shaped mandibles. Anterior buccal chamber surrounded by strongly developed sphincter muscle.
Pharynx muscular with conspicuous anterior swelling surrounding the base of buccal cavity and widening posteriorly but not forming true posterior bulb. Cardia small, with cuticularized lumen.
Tail straight or curved ventrally, conical in shape or with distinct conical proximal portion and a digitate (= subcylindrical) distal end.
Caudal glands present, opening via a common spinneret, caudal gland cells/bodies at level with posterior part of intestine, anterior to cloaca or extending anterior to end of the intestine.

Cobbionema differs from all other genera of Selachinematidae in having a sphincter muscle around the anterior buccal chamber.

Cobbionema can be distinguished from Halichoanolaimus by the cephalic sensilla being setiform and not papilliform.

Cobbionema can a be distinguished from Choniolaimus by the absence of terminal pharyngeal bulb

Ref: Ahmed et al., 2020

Females:

Didelphic, amphidelphic, ovary branches reflexed antidromously.
Vagina straight, without cuticularizations, surrounded by single sphincter muscle.
Vulva midventral, a transverse slit.
Rectum absent.

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

Cobbionema brevispicula, anterior region. A: female head detail; B: female head surface; C: male head surface; D: male head detail.
Dawings adapted from Ahmed et al., 2020

Males:

Diorchic, with outstretched anterior testis and reflexed posterior testis.
Spicules paired and symmetrical, elongate, consisting of two sections separated by a constriction, nearly straight, with rounded manubrium, subcylindrical shaft, or short with bifid tips.
Gubernaculum reduced to two sublateral crura, arcuate conoid in shape, flanking distal part of spicules.
Precloacal supplements 1 to 5, setose or papilloid, midventral.

Life Cycle:

For Ecophysiological Parameters for this genus, click

Ecosystem Functions and Services:

Predator.

Ahmed, M., Bostrom, S., Holovachov, O. 2020. Revision of the genus Cobbionema Filipjev, 1922 (Nematoda, Chromadorida, Selachinematidae). European Journal of Taxonomy 702; 1-34. :https://doi.org/10.5852/ejt.2020.702

Cobbionema

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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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: