Cheironchus vorax

Cheironchus vorax	Contents	Rev: 09/06/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
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Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae: Selachinematinae
Cheironchus vorax Cobb, 1917

Type species of the genus

Synonyms:

Dignathonema bulbosum Filijev, 1918

Cheironchus macramphis Schuurmans Stekhoven, 1950

Morphology and Anatomy:

Body cylindrical, stout.
Cuticle annulated and punctate. Lateromedian dots arranged in regular transverse rows. Lateral punctation larger in size, more scarce and less regular.
Head slightly set off from body by slight constriction.
Mouth opening wide, surrounded by six fleshy, conical, lips, each bearing a conical inner labial papilla terminally.
Labial region encircled by cuticular fold or collar. Head sensilla arranged in two circles in 6 + 10 arrangement. Six outer labial sensilla in form of conical papillae; lateral papillae shifted slightly anteriad because of amphids. Four cephalic sensilla in form of short setae occupying more lateral position in medio-lateral pairs.
Cephalic and somatic sensilla inserted in small oval pits.
Amphidial fovea large, coiled in five turns.
Cervical and somatic sensilla conical, papilliform and arranged in short longitudinal rows;
Somatic sensilla scarce in mid-body region.
Cheilostom small, cup-shaped, with rugae. Pharyngostom with three mandibles. Lateroventral mandibles well-developed, with central arm and two lateral palms. Central arm anteriorly with curved beak and transverse incisions along inner side of anterior arm. Dorsal mandible short and obscure, without differentiated tip or palms.
Pharynx with complicated musculature around pharyngostom. Anterior swelling of pharynx surrounded by external longitudinal muscle bands, inserted anteriorly on lip region cuticle and posteriorly on base of anterior pharyngeal swelling. Pharynx continuing into narrow cylindrical part and ending in spherical posterior bulb.
Tail very short, bluntly conical, with terminally thickened cuticle. Curved spinneret canal present within terminal tail cuticle. Two dorsal and four or five ventral papillae present at tail tip; some additional dorsal, subdorsal, ventral and subventral papillae situated on tail

	Females: Didelpphic-amphidalphic Ref: Tchesunov and Okhlopkov, 2006
Cheironchus vorax A: Anterior surface; B: Cephalic end; C: Posterior, male. Scale bars: A and B = 10um; C = 20um Drawings from Tchesunov and Okhlopkov, 2006
Males:
Diorchic with opposed testes, both located on right side of intestine. Spicules paired, equal, slightly arcuate, distally pointed, proximally narrowed into handle and slightly ventrally turned knob. Gubernaculum weakly developed, paired, plate-like and adjacent to spicules. Midventral row of 19-20 precloacal supplementary organs, cup-shaped with pore and nerve in anterior wall. Supplements decreasing gradually in size posteriorly. No precloacal midventral spine. Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Predatory marine nematodes. Reported from Biscayne Bay, Florida, USA. Also reported as few specimens from a wide range of sites.

Life Cycle:

Ecophysiological Parameters:

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

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.

Cheironchus vorax

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Classification:

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Morphology and Anatomy:

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Distribution:

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Feeding:

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Life Cycle:

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Management:

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References:

Copyright © 1999 by Howard Ferris.
Revised: September 06, 2024.

Cheironchus vorax

Copyright © 1999 by Howard Ferris. Revised: September 06, 2024.

Copyright © 1999 by Howard Ferris.
Revised: September 06, 2024.