Megalobatrachonema nipponicum

Megalobatrachonema nipponicum	Contents	Rev 12/23/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Megalobatrachonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Kathlaniidae Menu	Feeding	References
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Spirurina

Cosmocercoidea

Kathlaniidae

Megalobatrachonema nipponicum Yamaguti, 1941

Type species of the genus.

Morphology and Anatomy:

Body elongate, tapering to both extremities.
Cuticle with fine striation; very narrow lateral alae extending from level of nerve ring to tail.
Mouth small, surrounded by three undeveloped lips; dorsal lip with two large cephalic papillae, subventral lips with a large cephalic papilla and amphid
Pharynx short; esophageal bulb with valve-like structure.
Nerve ring anterior to middle of esophagus; excretory pore anterior to esophageal bulb.


Megalobatrachonema nipponicum Male anterior. ph=pharynx, nr=nerve ring; la=latal alae;ec=esophageal corpus; ep=excretory pore; eb= esophageal bulb; i=intestine Drawing from Tsuchida et al., 2024
Males: Single pseudosucker present, weakly developed Ten pairs of caudal papillae Spicules alate, pointed, Gubernaculum sclerotized, knife-like, Tail tapering, 679-861 um long	Female: Vulva not swollen, located variably about mid body Tail tapering, about 1 mm long. Ref: Tsuchida et al., 2024
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Described from intestine of Japanese Giant Salamander (Andrias japonicus).

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:

Tsuchida, K., Urabe, M., Nishikawa, K. 2024. Redescription and molecular phylogeny of Megalobatrachonema nipponicum Yamaguti, 1941 (Nematoda: Cosmocercoidea: Kathlaniidae). Can. J. Zool. 102:922-933.

Yamaguti, S. 1941. Studies on the helminth fauna of Japan. Part 34. Amphibian nematodes, 2. Jpn. J. Zool. 9: 403-405.