Ohbayashinema erbaevae

Ohbayashinema erbaevae	Contents	Rev: 04/11/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Ohbayashinema Menu	Economic Importance	Ecosystem Functions and Services
	Distribution	Management
Return to Heligmosomidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria

Rhabditida
Rhabditina
Infraorder Rhabditomorpha
Heligmosomoidea: Heligmosomidae
Heligmosominae
Ohbayashinema erbaevae Durette-Desset, Ganzorig, Audebert & Kamiya, 2000.

Synonyms:

Morphology and Anatomy:

Nematodes with marked sexual dimorphism, females 2x-3x longer than males.
Anterior part of male coiled along ventral side in two to three sinistral rings. Entire body of female coiled with 16 to 20 very tight sinistral rings.
Cephalic vesicle present, slightly assymetrical. Buccal opening surrounded by small ring; no inner-labial, 4 outer-labial papillae, four cephalic papillae and two amphids.
Dorsal esophageal gland clearly visible
Synlophe with fewer than 15 ridges; axis of orientation of the ridges sub-frontal or frontal; presence of a medio-lateral gradient of ridges on ventral side; absence of ridges in front of lateral fields;

	Females: Monodelphic with atrophied, non functional, posterior genital branch Vulva at 400 um from posterior extremity. Vagina vera directed anteriorly obliquely. Ovejector with vestibule 560um long, Vestibule in 3 parts: an enlarged proximal part, thin rectilinear median part, shorter distal part swollen to bulbous. Uterus 20.6% length of body, with numerous eggs (over 200), morula stage, 80 x 50 um.

Males: Caudal bursa assymetrical, of 2-3 type with right lobe larger. Prebursal papillae with long peduncle, situated on common trunk of rays 2 to 6 and not anterior to bursa. Spicules, thin, alate, 5.9% of body length. Chitinoid axis of each spicule doubled for almost whole length of spicule. Well-developed genital cone,. Ref: Durette-Desset et al., 2000
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Described from small intestine of pika, Ochotona daurica from Buriatia, Russia and from experimental host O. rufescens

Feeding:

Intestinal parasities of small lagomorph rodents, pikas (Ochotona)

Life Cycle:

Lif cycle direct. Infections were established in pikas by oral ingestion of infective ensheathed L3 larvae collected from pika feces.

Ecophysiological Parameters:

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

Ecosystem Functions and Services:

Durette-Desset, M-C. 1974. Ohbayashinema ochotonae n. gen., n. sp. (Nematoda, Trichostrongyloidea), parasite dâ€™un Lagomorphe du Nepal; interet phyletique de ce genre. Bulletin du Museum national dâ€™Histoire naturelle 216 (Zoologie 144):415-418.

Durette-Desset, M-C,. Ganzorig, S., Audebert, F., Kamiya, M. 2000. A new species of the genus Ohbayashinema (Nematoda, Trichostrongylina, Heligmosomoidea), parasite of Ochotona daurica (Ochotonidae, Lagomorpha) from Buriatia.. Zoosystema, 2000, 22 (4), pp.667-676.