Heligmosomoides

Heligmosomoides	Contents	Rev: 12/17/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Heligmosomoides Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Heligmosomidae Menu	Feeding	References
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Classification:

Chromadoria
Rhabditida: Rhabditina
Infraorder Rhabditomorpha
Heligmosomoidea: Heligmosomidae
Heligmosominae



Heligmosomoides Hall, 1916
Type species of the genus: Heligmosomoid polygyrus (Dujardin, 1845) Hall, 1916

Synonyms:

Strongylus polygyrus Dujardin, 1845

Viannaia polygyrus Hall, 1916

The synlophe is a pattern of surface longitudival cuticular ridges useful to distinguish among species of morphologically similar animal-parasitic nematodes, especially family Trichostrongylidae. For example, in Heligmosomoides polygyrus, the synlophe is described as follows:

Five ridges appear posterior to cephalic vesicle, other ridges appear at different levels between cephalic vesicle and excretory pore; roughly equivalent numbers on dorsal and ventral sides.
Ridges disappear at about 130 um anterior to caudal bursa in male, 110 um anterior to caudal extremity in females.
Number of ridges: at level of esophago-intestinal junction; 23 -26 , at mid-body, 24-27, within the distal fifth of the body, 25-31, differing slightly in number in males and females.Left ventral ridges slightly larger than the other ridges (Massoni et al., 2012).

The genus Heligmosomoides, as defined by Durette-Desset (1968) and Boulenger (1922), is characterized mainly by:

Body commonly coiled in a spiral, with transverse and longitudinal striations.
A very long vestibule and long deirids.
Asakawa (1988) divided the genus into five categories, of which the polygyrus line ï¿½which was differentiated from the other lines by very short spicules, small ridges, without a prominent size gradient and very narrow intervals between the ridges (Asakawa, 1988)

Females:

Monodelphic

Males:

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

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Distribution:

The genus Heligmosomoides is widespread in the Holarctic region and is found mainly in rodents of the Arvicolinae but also in the Murinae. Asakawa (1988) divided the species of the genus into five categories namely the ravassosi-douglasi lineï¿½, the relic groupï¿½, the laeviscarolinensis lineï¿½, the ongicirratum-longispiculatus lineï¿½ and the polygyrus line.

The polygyrus line parasitizes only Mus and Apodemus. Until now, three species belonging to this line have been described or recorded from China: Heligmosomoides polygyrus polygyrus; H. neopolygyrus and H. asakawae. H. neopolygyrus and H. p. bakeri are present in Japan (Massoni et al., 2012).

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Feeding:

Intestinal parasites of rodents

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Biology and Ecology:

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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:

Asakawa, M. 1988. Genus Heligmosomoides Hall, 1916 (Heligmosomidae: Nematoda) from Japanese wood mice, Apodemus spp. Journal of the College of Dairying, 12:349-365.

Boulenger, C.L. 1922. Structure and systematic position of Strongylus polygyrus. Parasitology 14: 206-213.

Dujsrdin, F. 1845.. Histoire naturelle des Helminthes ou Vers Intestinaux. Paris.

Durette-Desset M.C. 1968. Les systemes d'aretes cuticulaires chez les Nematodes Heligmosomes. III. Etude de sept especes parasites de Rongeurs nearctiques et retablissement du genre Heligmosomoides Hall, 1916. Bulletin du Museum national del Histoire naturelle, 40: 186-209.

Hall, M. C. 1916. Nematode Parasites of Mammals of the Orders Rodentia, Lagomorpha and Hyracoidea. Proc. U.S. Nat. Mus. L. 1-258

Massoni, J., Durette-Desset, M.C., Quere, J.P., Audebert, F. 2012. Redescription of Heligmosomoides neopolygyrus, Asakawa and Ohbayashi, 1986 (Nematoda, Heligmosomidae) from a Chinese rodent, Apodemus peninsulae (Rodentia: Muridae); with comments on Heligmosomoides polygyrus polygyrus (Dujardin, 1845) and related species in China and Japan. Parasite 19:367-374,