Richtersia

Richtersia	Contents	Rev: 03/24/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Richtersia 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
Desmodorida
Desmodorina: Desmodoroidea
Richtersiidae
Richtersia Steiner, 1916

Type species:

Synonyms:

Morphology and Anatomy:

Genus with characteristics of the family Richtersiidae, and:

Buccal cavity without teeth,
Extremely short (up to 300 um) and fusiform body
longitudinal rows of spines.
Distinctive short fusiform body.
Cuticle with small body annuli ornamented with longitudinal rows or fields of spines and setae.
Head usually set off from the body by a cuticular collar, in which lips and anterior setae are situated.
Four cephalic and six cervical setae present.
Buccal cavity without teeth.
Amphideal fovea, situated after cuticular collar.
Pharynx without posterior bulb.

.Richtersia argentinae (A) male head, amphid level; (B) male head, buccal cavity; (C) female tail; (D) male copulatory apparatus and tail.

Drawings from Pastor de Ward and Lo Russo, 2007

Females:

Didelphic, amphidelphic;
Ovaries in general antidromously reflexed.

Males:

Monarchic, testis outstretched,
Spicules equal or unequal
With or without gubernaculum.
Without actual supplements but precloacal thorn-like spines can be present (also postcloacal spines).

Ref: Pastor de Ward and Lo Russo, 2007

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

Distribution:

Mostly found in fine to medium grain sand and sometimes inm muddu marine sediments/.

Life Cycle:

For Ecophysiological Parameters for this genus, click

Ecosystem Functions and Services:

References:

Kreis, H.A., 1929. Freilebende marine Nematoden von der Nordwestkuste Frankreichs (Trebuerden: Cotes du Nord). Capita Zool. 2, 1-98.

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

Pastor de Ward, C.T., Lo Russo, V. 2007. A review of the genus Richtersia (Nematoda: Selachinematidae): new species from Golfo San Josï¿½ and Golfo San Matï¿½as, Chubut (Argentina). J. Mar. Biol. Ass. U.K. 87: 1153-1160

Richtersia

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:

Copyright © 1999 by Howard Ferris.
Revised: March 24, 2025.

Richtersia

Copyright © 1999 by Howard Ferris. Revised: March 24, 2025.

Copyright © 1999 by Howard Ferris.
Revised: March 24, 2025.