Amphimonhystera

Amphimonhystera	Contents	Rev: 08/04/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Amphimonhystera 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
Amphimonhystera Allgen, 1929

Type species: Amphimonhystera anechma (Southern, 1914) Allgen, 1929

Synonyms:

Morphology and Anatomy:

With general characteristics of family Xyalidae, and:

Cuticle annulated, often yellowish or slightly brownish in both live and fixed specimens.
Subcuticular hypodermis filled with brown granules.
Outer labial and cephalic setae of nearly equal length. In adults, additional setae may be inserted into the circle of outer labial and cephalic setae.
Amphidial fovea very large, longitudinally oval, with distinct edging and pore to canalis amphidialis nearthe center of the amphidial fovea.
Buccal cavity small and very short.
Pharynx anterior slightly swollec, no posterior bulb.
No renette cell.
Tail elongate conical, with weakly formed posterior cylindrical portion and very slightly inflated terminally.
Terminal setae on the tail may be present or absent

Females:

Monodelphic-prodelphic. Anterior portion of the ovary on left of the intestine while the ovary tends to be bent ventrally and posterior portion situated to the right side of the intestine.

Ref: Tchesunov, and Mokievsky, 2005; Huang and Guo, 2022

Males:

Reproductive system monorchic or diorchic.
Anterior testis straight, to the left of the intestine; posterior testis reflexed, to the right of the intestine.
Spicules small, strongly bent, proximally cephalated and distally acute.
Gubernaculum absent or small and parallel to distal part of spicules.

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

Distribution:

Free-living marine nematodes. Species have been described from shallow-water sediment in the White Sea of Russia and from deep sea arctic locations.

Feeding:

Food Sources and Feeding strategies for the genus Amphimonhystera

Life Cycle:

For Ecophysiological Parameters for this genus, click

Ecosystem Functions and Services:

References:

Allgen, C.A. 1929. Freilebende marine Nematoden aus der Umgebung der staatlichen zoologischen Station Kristineberg an der Westkoste Schwedens. Capita Zoologica (sGravenhage), 2(8), 1-52

Huang, Y., Guo, Y. 2022. Order Monhysterida Filipjev, 1929. In: Free-living Marine Nematodes from the East China Sea. Springer, Singapore. https://doi.org/10.1007/978-981-16-3836-7_{_}9

Tchesunov, A. and Mokievsky, V.O. 2005. A review of the genus Amphimonhystera Allgen, 1929 (Monhysterida: Xyalidae, Marine Freeliving Nematodes) with description of three new species. Zootaxa 1052:1-20.

Venekey, V., Gheller, P.F., Maria , T.F., Brustolin, M.C., Kandratavicius , N., Vieira , D.C., Brito, S., Souza, G.S., Fonseca, G. 2014. The state of the art of Xyalidae (Nematoda, Monhysterida) with reference to the Brazilian records. Marine Biodiversity DOI 10.1007/s12526-014-0226-3