Deontostoma quadridentata

Deontostoma quadridentatum	Contents	Rev: 02/21/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Deontostoma Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Leptosomatidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Deontostoma quadridentatum Shimada & Jimi, 2022

    Synonyms:

Morphology and Anatomy:

With general characteristics of the subfamily Deontostomatinae

All anterior sensilla papilliform or very short setiform, never long setiform.
Cephalic capsule well developed with six lobes and without tropis.
Interlobar grooves divided into furrows and fenestra

Unique to this species:

Body cylindrical, gradually tapering toward both ends.
Cuticle 5-15 um thick in cephalic region, thicker and very thick, 20-35 um thick at midbody; comprised of several layers, finely striated.
Four odontia on each mandible (hence species name).
Six inner labial sensilla papilliform. Six outer labial and four cephalic sensilla short setiform, equal in length, in a single circle. Cervical sensilla short setiform, sometimes in clusters of two or three,
Somatic sensilla sparse except in cervical and caudal regions.
Cephalic capsule well developed, divided into six lobes, without tropis. Each lobe often with shallow notch, without intralobar lacuna. Interlobar grooves divided into furrow and fenestra with two short posterior incisions.
Amphids pocket-like, with transversely elliptical aperture and strongly cuticularised fovea, located in lateral interlobar grooves, just posterior to outer labial and cephalic sensilla.
Mouth opening triangular, enclosed by one dorsal and two ventrosublateral microlabia: ventrosublateral microlabia divided by mandibles; dorsal microlabium undivided.
Three mandibles well developed, each equipped with four odontia.
Buccal cavity conical-shaped with one large dorsal and two smaller ventrosublateral onchia situated posteriorly.
Pharynx surrounding posterior part of buccal cavity; gradually widened to posterior end.
Cardia short, surrounded by intestinal tissue.
Ocelli absent. Nerve ring at one quarter of pharyngeal length from anterior end.

	Females: Body similar to those of males Several somatic subventral setae present in preanal region.. Tail slightly longer than in males, Didelphic, amphidelphic with opposed, telogonic, and antidromously reflexed ovaries, both on left side of intestine. Vulva slit-like at 56-60% of body length. Vagina with thick cuticular wall, surrounded by vaginal glands Ref Shimada & Jimi, 2022

Males: Diorchic, testes opposed, outstretched. Seminal vesicle inconspicuous. Vas deferens beginning at 54-56% of body length and leading to muscular ejaculatory duct at 72-76% of body length. Spiculespaired, slightly arcuate, length 1.6- 2.3 cloacal body diam., flattened and curved outward: capitulum slightly enlarged; calomus short; lamina with central lamella(e) and terminal pore; ventral velum present. Gubernacula paired, on outsides of spicules: corpus slightly arcuate and parallel to spicule, One precloacal ventromedian supplement Two precloacal subventral rows of 8-10 setae beginning just anterior to cloaca followed by 12-20 papillae with setae. Tail 1.0-1.1 cloacal body diam., conical, with blunt tip. Caudal glands extending anterior to cloaca Spinneret with minute terminal pore. Eight rows of caudal setae present

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

Distribution:

Described from Southern Ocean, off the South Orkney Islands

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:

References:

Hope, W.D. 1982. Structure of head and stoma of the marine nematode genus Deontostoma (Enoplidae: Leptosomatidae). Smithsonian Contrib. Zool. 353.

Leduc, D. (2013). Deontostoma tridentum n. sp. (Nematoda, Leptosomatidae) from the continental slope of New Zealand. Zootaxa 3722, 483-492. DOI: 10.11646/zootaxa.3722.4.3

Shimada, D., Jimi, N. 2022. Taxonomic revision of the free-living marine nematode genus Deontostoma (Enoplida: Leptosomatidae) and inclusion of a new species from the Southern Ocean. Nematology 24:1031-1047..doi: https://doi.org/10.1163/15685411-bja10189

Deontostoma quadridentatum

Contents

Classification:

Back to Top

Morphology and Anatomy:

Back to Top

Distribution:

Back to Top

Feeding:

Back to Top

Biology and Ecology:

Back to Top

Life Cycle:

Back to Top

Ecosystem Functions and Services:

Back to Top

Management:

Back to Top

References:

Back to Top

Copyright 1999 by Howard Ferris.
Revised: February 21, 2024.

Deontostoma quadridentatum

Copyright 1999 by Howard Ferris. Revised: February 21, 2024.

Copyright 1999 by Howard Ferris.
Revised: February 21, 2024.