Manganonema

Manganonema	Contents	Rev: 03/22/2022
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Manganonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Xyalidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Monhysterida: Monhysterina
Sphaerolaimoidea
Xyalidae
Manganonema Bassau, 1993

Synonyms:

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Morphology and Anatomy:

Several of the species have been described from a single male specimen.

Conspicuous narrow anterior end; head diameter at least one third smaller than the body diameter at level of amphidial fovea, and marked or set off from the rest of the body by a narrowing region.
Anterior sensilla arranged in two circlets: an anterior crown of six inner labial papillae, a second crown of six outer setiform labial sensilla and four cephalic sensilla (papilliform or setiform).
Stoma minute, surrounded by pharyngeal musculature.
Amphideal fovea round, and relatively large (40-90% cbd).
Tail pointed, curved dorsally upon fixation.
Body cuticle transversely striated; somatic setae short more or less papilliform and difficult tosee under light microscopy, arranged in four longitudinal rows (two latero- ventral and two latero-dorsal).
No ventral gland of secretory-excretory system present. .

Females:

Monodelphic; anterior outstretched ovary to the left of the intestine.
Vulva simple, located at mid-body.
No differentiation of uterus, no spermatheca observed.

Ref: Fonseca et al. 2003

Males:

Monorchic testis outstretched anteriorly on left of the intestine
Vas deferns long and narrow
Spicules paired, straight; weak gubernaculumwithout apophysis.
Sperm cells small, globular, with a very dense nucleus

Body size range for the species of this genus in the database - Click:

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Distribution:

Free-living marine nematodes generally at depths > 600 m. Worldwide distribution.

Usually found in low population densities; everal of the species have been described from a single male specimen (Fonseca et al., 2003)..

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Feeding:

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Biology and Ecology:

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

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Management:

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References:

Fonseca, G, Decraemer, W. Vanreusel, A. 2006. Taxonomy and species distribution of the genus Manganonema Bussau, 1993 (Nematoda: Monhysterida). Cah. Biol. Mar 47:189-203.

Manganonema

Copyright © 1999 by Howard Ferris. Revised: March 22, 2022.

Copyright © 1999 by Howard Ferris.
Revised: March 22, 2022.