Schrankiana chacoensis

Schrankiana chacoensis	Contents	Rev 11/08/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Schrankiana Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Atractidae Menu	Feeding	References
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Spirurina

Cosmocercoidea

Atractidae

Schrankiana chacoensis Gonzalez & Hamann, 2014

Morphology and Anatomy:

Cylindrical nematodes with fine transversally striated cuticle,
Lateral alae present in both sexes; somatic papillae minute, distributed over body surface
Oral opening triangular with three lips; dorsal lip with two large papillae, subventral lips with one large papilla on each one. One forked amphid on each subventral lip. Each lip with cuticular flange overhanging mouth opening
Pharynx relatively elongate and slender; esophagus with muscular corpus, short isthmus and well-developed posterior bulb with valves
Anterior extremity of esophagus with three large and relatively elongate tooth-like projections.
Excretory pore anterior to level of bulb; large, slit-like, with small comb-like fringe in the posterior and anterior edges
Tail conical and sharply pointed in both sexes


Schrankiana chacoensis (A) Male, ventral view; (B) female, lateral view; (C) cephalic end of female, lateral view; (D) anterior end of female, lateral view Drawings from Gonzalez and Hamann, 2014
Males: Lateral alae extending from anterior third of esophagus to the level of first pair of precloacal papillae. Tail short, conical, with caudal appendage. Fourteen pairs of sessile caudal papillae and one large unpaired papilla anterior to cloaca. Posterior margin of cloaca with cuticular comb-like fringe. Spicules relatively short, curved ventrally, sharply pointed distally and with variably shaped capitulum; gubernaculum sclerotized, elongated, posterior end pointed Caudal alae absent	Female: Monodelphic-prodelphic Vulva a transverse slit just anterior to anus. Uteri with one to three oval eggs, thin shelled, some of them with larvae Viviparous Lateral alae extending from anterior third of oesophagus at level of vulva. Ref: Gonzalez and Hamann, 2014
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Described from white-lipped frog, Leptodactylus bufonius in Chaco Province, Argentina

In Schrankiana chacoensis, as in other Atractidae, eggs hatch and larvae develop to the third stage within the uterus; these larvae autoinfect the host. Autoinfection is generally accompanied by high intensities with few large larvae. Transmission among host individuals is unknown (Anderson 2000; Gonzalez and Hamann, 2014)

Ecophysiological Parameters:

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

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Ecosystem Functions and Services:

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Management:

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References:

Baker, M.R., Vaucher, C. 1988. Parasitic Helminths from Paraguay XV: Atractidae (Nematoda: Cosmocercoidea) from frogs. Rev Suisse Zool. 95:421-431.

Gonzalez, C.E. and Hamann, M.I. 2014. Schrankiana chacoensis sp. nov. (Nematoda: Atractidae) from Leptodactylus bufonius Boulenger, 1894 (Anura: Leptodactylidae) from Argentina. J. Natural History 48:35-49.