Rhynchonema veronicae

Rhynchonema veronicae	Contents	Rev: 03/26/2022
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Rhynchonema Menu	Economic Importance	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
Rhynchonema veronicae Bezerra, Smol & Vincx, 2014

Synonyms:

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Morphology and Anatomy:

Body elongated, tapering sharply anteriorly to the amphids.
Cuticle strongly annulated with annulations reaching the end of the cheilostome. Annuli with a dentate shape sharply angled forward on the anterior half of the body and backward on the posterior half of the body. The inversion point of the annuli at about 58% of the body.
Somatic setae about 11 um long, very thin, distributed along the body in six longitudinal rows.
Six cephalic setae of about 1.5 um length are present; other sensilla not visible.
Amphids are almost circular (diameter 4.6 um, about 52.3 % of the corresponding body diameter, located at the base of the pharyngostome, 43 um from the anterior end.
Stoma unarmed, about 45 um long in males, with low lips, a short cheilostome and a narrow tubular pharyngostome.
Pharynx is cylindrical, slightly expanded at the posterior end.
Cardia small, protruding into the cylindrical intestine.
Tail is conical, ventrally curved; three caudal glands open at a terminal spinneret.

Ref: Bezerra et al., 2014.

	Females: Monodelphic-prodelphic, with outstretched ovari lying to the left side of the intestine. Spermatozoa are regularly found in the spermatheca. Perivulvar gland cells are present, ovejetor strongly sclerotized. Vulva is sclerotized without operculum.
Rhynchonema veronicae a. Male head, cheilostome, pharyngostome and amphid; anteriorly directed annule edges. b. entire male head showing anterior narrowing, amphid, nerve ring, the cardia, the inversion point of the annules. From Bezerra et al., 2014
Males: Diorchic, testes anteriorly outstretched . Spicules asymmetric, almost the same length but the right spicule is more robust, with strong sclerotization and is also more curved than the left one. Posterior extremityof spicules has an arrow shape; capitulum aglobular shape with open extremities resembles a sickle. Gubernaculum bears a sleeve with asymmetric posterodorsal apophyses.
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

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Distribution:

Marine nematodes described from medium grain size sand in intertidal zone of exposed sandy beach, Olindaï¿½s Isthmus, Pernambuco, Brazil.

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Economic Importance:

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Feeding:

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Biology and Ecology:

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Life Cycle:

Spermatazoa in spermatheca and frequency of males suggests sexual reproduction.

Ecophysiological Parameters:

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

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Ecosystem Functions and Services:

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Management:

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References:

Bezerra, T.N. Smol, N. , Vincx, M. 2014. Two new species of Rhynchonema Cobb, 1920 from a Brazilian sandy beach. Mar Biodiv DOI 10.1007/s12526-014-0223-6

Rhynchonema veronicae

Copyright © 1999 by Howard Ferris. Revised: March 26, 2022.

Copyright © 1999 by Howard Ferris.
Revised: March 26, 2022.