Monhystrium

Monhystrium	Contents	Rev: 11/19/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Monhystrium Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Monhysteridae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Monhysterida: Monhysterina
Monhysteroidea
Monhysteridae: Diplolaimellinae
Monhystrium Cobb, 1920: Type species of the genus: Monhystrium transitans Cobb, 1920

Synonyms:

Morphology and Anatomy:

Medium to long (0.8-1.7 mm).
Inner labial sensilla papilliform; outer labial and cephalic sensilla in one circle, same or different in length, with either outer labial or cephalic sensilla being longer than the others.
Amphids round; less than 1.5 head diameters from the anterior body end.
Ocelli present or absent.
Buccal cavity cuticularized and distinctly divided into two chambers: anterior chamber conoid; posterior chamber spherical, with sharp tooth-like anterior edges, with or withour denticles.
Pharynx cylindrical. Progaster present. Ventral gland present or absent, excretory pore opens along the anterior region of the pharynx.
Tail conoid to subcylindrical, digitate. audal glands opening in via common spinneret.

Females:

Ovary on the right-hand side of intestine.

Ref: Westerman et al., 2022

Males:

Testis on the right-hand side of intestine.
Spicules simple and narrow, weakly arcuate.
Gubernaculum platelike.
Precloacal spine may be present.
Bursa present.
Paired subventral papilla present, pre- and postcloacal, within or outside bursa

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

Distribution:

Found in gill chambers of land crabs in different parts of the world.

Feeding:

Probably commensals with cructaceans; Usually found in gill chambers of crustaceans. Parasites of terrestrial crabs.

The genera Odontobius, Gammarinema Monhystrium and Tripylium are exclusively commensally epibiotic and numerous groups of crustaceans are the most common hosts for free-living nematodes (Holovachov et al., 2011).

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Biology and Ecology:

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:

Cobb N.A. 1920. One hundred new nemas. Contributions to a Science of Nematology 9: 217-343.

Holovachov, O., Bostrom, S., Reid, N., Waren, A., Schander, C. 2011. Endeolophos skeneae sp. nov. (Chromadoridae) - a free-living marine nematode epibiotically associated with deep-sea gastropod Skenea profunda (Skeneidae). Journal of the Marine Biological Association of the United Kingdom, 91:387-394.

Westerman, R., Ahmed, M., Holovachov, O. 2022. Gammarinema scyllae sp. n. and Monhystrium mangrovi sp. n. (Nematoda: Monhysteridae) from land crabs from New Caledonia. Systematic Parasitology 99:83-101.

Monhystrium

Copyright © 1999 by Howard Ferris. Revised: November 19, 2024.

Copyright © 1999 by Howard Ferris.
Revised: November 19, 2024.