Rhigonema sinense

Rhigonema sinense	Contents	Rev 02/21/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Rhigonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Rhigonemaidae Menu	Feeding	References
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Spirurina

Rhigonematomorpha

Rhigonematoidea

Rhigonematidae

Rhigonema sinense Zhang, Wang, Hasgawa, Nagae, Chen, Li & Li, 2022

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Morphology and Anatomy:

Small-sized nematodes with a maximum width at about mid-body. \
Cephalic region heavily cuticularized, with well-developed cephalic cap and smooth cephalic collar. Cephalic cap bearing three lips, a dorsal lip with one pair of large cephalic papillae, two subventral lips each with a single large cephalic papilla.
Amphidial apertures located laterally at junction of cephalic cap and cephalic collar.
Oral aperture simple, somewhat triangular.
Cuticle posterior to cephalic region with dense, transverse rows of small spines (microtrichs); rows of spines gradually becoming distinctly sparser and smaller towards posterior region of body and disappearing at about the anterior 25% of body length.
Esophagus divided into short chitinized pharynx with three fabellate pharyngeal plates, muscular cylindrical corpus (posterior part slightly wider than anterior part), inconspicuous isthmus and ovoid or nearly rounded posterior bulb.
Nerve ring at about 50% of esophageal corpus.
Excretory pore close to junction of corpus and posterior esophageal bulb of esophagus.
Tail of both sexes conical, with polymorphic tip



Male: Spicules unequal in length Spicules surfaces decorated with scattered punctations No gubernaculum Four pairs of precloacal papillae and seven pairs of postcloacal papillae.	Female: Didelphic-amphidelphis, ovaries reflexed Ref: Zhang et al., 2022
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:strong>

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Distribution:

Intestinal parasites in the hind gut of the round-backed millipede Spirobolus bungii (Spirobolida, Spirobolidae, Arthropoda). Species described from Hebei Province, China.