Cobbionema acrocerca

Cobbionema acrocerca	Contents	Rev: 08/31/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Cobbionema Menu		Biology and Ecology
	Distribution	Management
Return to Selachinematidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae
Cobbionema acrocerca Filipjev, 1922

Type species of the genus:

Synonyms:

Morphology and Anatomy:

Within the genus Cobbionema, C. acrocerca is characterized by:

body length 0.59-0.86 mm
lateral alae present with body pores arranged on either sides of lateral alae;
cephalic sensilla equal to 0.3-0.6 labial region diameters in length;
amphideal fovea sexually dimorphic, with 4.25-5.25 turns in males and 3.25-3.75 turns in females;
two rows of pointed projections and a third row with three prominent sharply pointed tines in the stoma, rows of projections close to one another longitudinally;
spicules consisting of two sections, 50-58 um long; single precloacal papilliform sensillum;
tail with conoid proximal and digitate distal section.

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.
Cobbionema acrocerca A-B: female head, detail and surface; C: male head, surface; D: male anterior; E: female amterior gonad; F: female caudal; G: male caudal H: spicule, I: gubernacular crura. Scale bar = 20 um. Drawings 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 Gubernaculum reduced to two sublateral crura, arcuate conoid in shape, flanking distal part of spicules. Precloacal supplements midventral. 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, including Chromadoridae.

Life Cycle:

Ecophysiological Parameters:

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

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