Desmotersia

Desmotersia	Contents	Rev: 02/23/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Desmotersia Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Selachinematidae Menu	Feeding	References
see also Richtersiidae	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Chromadorida
Selachinematidae
Desmotersia Neira & Decraemer, 2009

Type species: Desmotersia levinae Neira & Decraemer, 2009

Synonyms:

Morphology and Anatomy:

Cuticle annulated and with longitudinal rows of spine-like ornamentations; lateral differentiation present.
Head set off from body by thick sclerotized capsule, asymmetrical in lateral view, bilaterally symmetrical along dorso-ventral axis in frontal view.
Lip region thin-walled, consisting of 12 lobes around mouth opening; each lobe with an inner cuticular tube, lining the cheilostome.
Six inner labial setae on thin-walled lip region. Six outer labial setae and four cephalic setae arranged in a single crown at anterior border of head capsule; cephalic setae shorter than outer labial setae.
Amphid with pore-like opening and associated oblique slit near anterior border of head capsule; amphideal fovea a single, ventrally whirled loop fitting in anterior wall of capsule as a flap-like structure in male; fovea more flattened and with partial loop loop in female and juvenile.
Gland cells with yellowish granular appearance visible beneath cuticle of head capsule.
Stoma with wide, cylindrical cheilostome, gymnostome with wall strengthened by tubular support and subdivided pharyngostome surrounded by pharyngeal tissue and a dorsal tooth inserted at level of subdivision.
Pharynx largely cylindrical with slight posterior widening.

Females:

Ddelphic-amphidelphic; ovaries reflexed and with variable position relative to intestine;
Vagina bipartite,
Vulva at mid-body or slightly posterior.

Males:

Monorchic; testis outstretched anteriorly.
Copulatory apparatus with long spicules without differentiated capitulum but with a thin velum, slightly unequal in size.
Gubernaculum with apophyses

Ref: Neira and Decramer, 2009

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

Distribution:

Typr species described from a bathyal oxygen minimum zone sediments in deep ocean off the coast of Peru.

Life Cycle:

For Ecophysiological Parameters for this genus, click

Ecosystem Functions and Services:

Neira, C., Decraemer, W. 2009. Richtersia levinae, a new genus and new species of free-living nematode from bathyal oxygen minimum zone sediments off Callao, Peru, with discussion on the classification of the genus Richtersia (Chromadorida: Selachinematidae). Organisms, Diversity and Evolution 9: 1.e1-1.e15

Desmotersia

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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Feeding:

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Biology and Ecology:

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Life Cycle:

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Ecosystem Functions and Services:

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Management:

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References:

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Copyright © 1999 by Howard Ferris.
Revised: February 23, 2024.

Desmotersia

Copyright © 1999 by Howard Ferris. Revised: February 23, 2024.

Copyright © 1999 by Howard Ferris.
Revised: February 23, 2024.