Helgenema keablei

Helgenema kealbei	Contents	Rev: 12/02/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Helgenema Menu	Economic Importance	Ecosystem Functions and Services
	Distribution	Management
Return to Heligmonellidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria

Rhabditida
Rhabditina
Infraorder Rhabditomorpha
Heligmosomoidea: Helligmonellidae
Nippostyrongylinae
Helgenema kealbei Smales, 2020

Synonyms:

Morphology and Anatomy:

Small slender worms, may be coiled.

Cephalic vesicle prominent with about 4 trans-verse annulations.

Buccal capsule vestigial, mouth opening triangular with rudimentary lips; cephalic and labial papillae not seen, 2 lateral amphids.

Esophagus claviform, nerve ring, excretory pore and deirids not seen.

Synlophe: Longitudinal pointed ridges extend from posterior margin of cephalic vesicle to anterior to bursa or vulva; with 13-14 ridges in males, 11-15 in females; 13 ridges in males, 9-11 in females in anterior body; 14 ridges in males, 15 in females in mid body; 15 ridges in females in posterior body. Cuticular dilatation of left side, supported anteriorly by large ridge 1 becoming smaller posteriorly; other ridges small without size gradient at mid body. Axis of orientation of ridges sub frontal; 7-8 ridges dorsal side, 7-8 ventral side males and females.

Females:

Length 2.4-3.0 mm, maximum width 47-60 (55) um.

Cephalic vesicle 23-26 um long.

Vulva opens 90-110 um from tail tip, posterior end reflexed ventrally.

Monodephic

Tail conical with pointed tip,

Eggs thin shelled, ellipsoidal, 2-4 in utero

Ref: Smales, 2020

Males:

Length 2.5 -3.4 mm, maximum width 30-66 um.
Cephalic vesicle 17-20 um long.
Bursa relatively small, dissymmetrical, left lobe larger; pattern of rays 2-3. Dorsal lobe shorter than laterals; dorsal trunk symmetrical divided at about half its length, terminal divisions rays 9, 10, not reaching margin of bursa; lateral rays 6, 5, 4 about same size, reaching margin of bursa, rays 3, 2 arise together from common trunk, reaching margin of bursa.
Spicules equal, filiform, tips curved,
Gubernaculum 18-19 um long.

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

Distribution:

Described from small intestine of Paramelomys levipes (Muridae) from Papua New Guinea

Feeding:

Parasites of the small intestine of a murid rodent

Biology and Ecology:

An intestinal parasites of rodents in the family Muridae

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:

Smales, L.. 2020. Gastrointestinal nematodes of Paramelomys levipes and P. mollis (Rodentia: Muridae) from Papua, Indonesia and Papua New Guinea with the descriptions of three new genera and nine new species (Nematoda). Zootaxa 4861:544-572.

Helgenema kealbei

Contents

Classification:

Back to Top

Morphology and Anatomy:

Back to Top

Distribution:

Back to Top

Feeding:

Back to Top

Biology and Ecology:

Back to Top

Life Cycle:

Back to Top

Ecosystem Functions and Services:

Back to Top

Management:

Back to Top

References:

Back to Top