Urbanonema osorioi

Urbanonema osorioi	Contents	Rev 12/23/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Urbanonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Hystrignathidae Menu	Feeding	References
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Classification:

Rhabditida
Spirurina
Thelastomatoidea: Hystrignathidae

Urbanonema osorioi Garduno-Montes de Oca & Oceguera-Figueroa, 2020

Morphology and Anatomy:

Robust fusiform nematodes.
Cephalic region of 2 annules, the anterior with 4 pairs of rounded papillae
Cuticle with spines at anterior region from posterior cephalic annule to level of basal bulb-intestine junction level.
Lateral alae absent but with lateral gaps inspinous region,
Excretory pore conspicuous, posterior to basal bulb; excretory duct surrounded by a small vesicular body surrounds the excretory duct.
Stoma anteriorly dilated, without an esophageal collar; the rest of stoma narrow and surrounded by an esophageal collar
Esophagus completely muscular. Procorpus, clavate, narrow anteriorly, wider at base. Isthmus short, spherical basal bulb with sclerotized valves

Female:

Didelphic-amphidelphic
Vulva located at midbody, with lips slightly salient.
Vagina muscular, anteriorly directed.
Eggs ovoid, with rough longitudinal ridges on the shell
Conical tail, subulate, ending in a sharp tip

Ref: Garduno-Montes de Oca and Oceguera-Figueroa, 2020

Urbanonema osorioi Female: spinous anterior region,
Scale bar = 50 um
Scanning electron micrograph by Garduno-Montes de Oca and Oceguera-Figueroa, 2020

Male:

Not found

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:strong>

Distribution:

Reported from Bess beetles, Vindex agnoscendus (Passalidae)

Feeding:

Described from hindgut of a passalid beetles, Veres hageni (Coleoptera) in Oaxaca, Mexico

Life Cycle:

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:

References:

Adamson, M.L. and Van Waerebeke, D. 1992. Revision of the Thelastomatoidea, Oxyurida of invertebrate hosts III . Hystrignathidae. Systematic Parasitology 22:111-130

Garduno-Montes de Oca, U. and Oceguera-Figueroa, A. 2020. Molecular phylogeny of Thelastomatoidea( Nematoda) with the description of a new genus and two new species of Hystrignathidae associated with Bess beetles (Coleoptera: Passalidae) from Oaxaca, Mexico. J. Parasitol. 106:679-688.