Acantholaimus angustus

Acantholaimus angustus	Contents	Rev: 04/04/2023
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Acantholaimus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Chromadoridae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Chromadoridae: Subfamily Spilipherinae
Acantholaimus angustus Bussau, 1993

    Synonyms:

Morphology and Anatomy:

Body with narrowed anterior end and filiform posterior end.
Somatic setae 2â€“8 um long, numerous, along entire body in 4 sublateral rows. In postanal region, somatic setae clavate, i.e. with widened distal end; on rest of body, setae cylindrical or clavate.
Cuticle densely dotted (dots arranged in transverse rows), with lateral fields consisting of larger dots. Lateral fields beginning at posterior border of amphideal fovea and extending along entire body length except filiform part of tail.
Cuticle about 1.0â€“1.5 um thick along entire body length except at level of cephalic setae, where it is thinner (0.3â€“0.5 um),
Two rings of head sensilla visible: 6 outer labial setae 3.5â€“4.5 um long, and 4 submedian cephalic setae 7 â€“8 um long.
Amphideal fovea large, ventrally coiled, single-spiral, in form of longitudinally oriented oval or round, 9â€“10 um width in males
Two pairs (latero-subdorsal and latero-subventral) of cervical setae 4â€“ 6 umm long, located close to posterior part of amphideal fovea. In latero-subventral pair of cervical setae, the distance between anterior and posterior setae is approximately twice the distance between setae of latero-subdorsal pair.
Stoma consisting of wide, barrel-shaped cheilostoma and narrow pharyngostoma. At least two small sclerotized onchia about 1um long (presumably, dorsal and subventral) visible at anterior end of pharyngostoma. Pharyngostoma about10 um long.
Pharynx muscular, relatively thin and cylindrical in anterior 3/4 of its length, posterior 1/4 of pharynx widened and containing large, regularly alternating plasmatic inclusions.
Nerve ring and renette cell not visible.
Cardia small, surrounded by intestine.
Tail consisting of proximal conical part and long terminal filiform cylindrical part about70% of entire tail length

Females:

Didelphic, amphidelphic

Ref: Miljutina et al., 2013

Males:

Monorchic. Testis directed anteriorly, outstretched, lying to the right of intestine, occupying 40â€“50% of total body length.
Spermatozoa oval, large with clearly visible, oblong nuclei.
Curved spicules possessing complex cuticular sculpture with thickened cuticular areas in form of longitudinal ridges.
Gubernaculum shaped as curved stick with edged proximal end and bifurcated distal end.
Supplementary organs not found

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

South-eastern Pacific, Peru Basin, nodule fields, 4157 m depth, 4159 m (Bussau, 1993); north-eastern tropical Pacific, Clarion-Clipperton Fracture Zone, nodule fields, abyssal plain without nodules, 4800â€“5042 m depth, ooze (Miljutina & Miljutin, 2011); south-eastern Atlantic, Angola Basin, 5450 m depth (Miljutin et al., 2013).

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Feeding:

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Biology and Ecology:

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Life Cycle:

Ecophysiological Parameters:

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

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Ecosystem Functions and Services:

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Management:

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References:

Bussau C. 1993. Taxonomische und oÂ¨kologische Untersuchungen an Nematoden des Peru-Beckens. PhD thesis. Christian-AlbrechtsUniversitat, Kiel, Germany.

Miljutina M.A. and Miljutin D.M. 2011. Seven new and four known species of the genus Acantholaimus (Nematoda: Chromadoridae) from the abyssal manganese nodule field (Clarionâ€“Clipperton Fracture Zone, North-Eastern Tropical Pacific). Helgoland Marine Research. DOI 10.1007/s10152-011-0282-z.

Miljutina, M. A.., Miljutin, D.M., Tchesunov, A.V. 2013. Seven Acantholaimus (Chromadoridae: Nematoda) species from one deep-sea sediment sample (Angola Basin, south-east Atlantic). J. Marine Biol Assoc U.K. 93:935-953.