Acanthonchus singaporensis

Acanthonchus singaporensis	Contents	Rev: 04/21/2022
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Acanthonchus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Cyatholaimidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida: Chromadorina
Chromadoroidea
Cyatholaimidae
Acanthonchus singaporensis Chen, Nguyen & Smol, 2015.

    Synonyms:

Morphology and Anatomy:

Described from male specimens.

:Body slender, curved ventrally, 1255 um long.
Anterior blunt and posterior gradually tapering to a conical tail.
Cuticle striated with transverse rows of minute punctations but irregular laterally at the posterior region.
Head diameter 18.1 um with six inner labial papillae, six outer labial papillae and four cephalic setae.
Cervical setae short, including setae posterior to the amphid.
Amphid multispiral with 5.5 turns (9.2 um wide, 41.1% of corresponding body diameter).
Buccal cavity shallow with a hollow dorsal tooth.
Esophagus cylindrical.
Nerve ring 78.1 um from anterior.
Excretory pore not observed.
Pore-liked structure present on the cuticle along the body region.
Occellus absent. Testes paired and opposed. Spicule paired, equal in length, curved and cuticularised (37.5 Âµm long). Central cuticularised

Females:

Males:

Testes paired and opposed.
Spicules paired, equal in length, curved and cuticularized (37.5 um long) with cental cuticularized strip.
Gubernaculum paired and almost as long as spicules, expanding into a triangular plate at the distal end.
Six precloacal tubular supplements; anteriormost 105.5 um from cloaca; two small posterior tubuli close to each other near to the cloaca.
Caudal gland not observed.
Tail conical (2.55 x cloacal body diam).

Ref: Chen et al., 2015

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

Distribution:

Free-living marine nematodes described from sediment samples from a small intertidal sandy-rocky beach at Tanjung Tajam at the westernmost corner of Pulau Ubin in the East Johor Strait, Singapore.

Life Cycle:

Ecophysiological Parameters:

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

Ecosystem Functions and Services:

Chen, C-A., Nguyen, D.T., Smol, N. 2015. Two new free-living marine nematode species from an intertidal sandyrocky shore on Pulau Ubin, Singapore with a key to the valid species of the genera Prooncholaimus and Acanthonchus. Raffles Bull. Zoology Suppl. 31 68-74.