Viannalidae

Family: Viannaiidae

Revised 06/03/24

Classification:

Chromadorea: Chromadoria
Rhabditida: Rhabditina
Infraorder Rhabditomorpha
Heligmosomoidea

Viannaiidae (Neveau-Lemaire, 1944) Durrete-Desset & Chabaud, 1981

Two Subfamilies:

Hydrochoerisnematinae - intestinal parasites of rodents; left lateral lobe of bursa atrophied.
Viannaiinae - intestinal parasites of rodents, marsupials and primates; left lateral lobe of bursa developed.

Morphology and Anatomy:

Buccal capsule reduced; cephalic vesicle present.
Synlophe with three lafr subventral ridges or with ridges on dorsal and ventral surface
Careen absent
Females didelphic or monodelphic
Female tail without spine

Ref: Beveridge et al., 2014

Distribution

Reported as parasites of South American rodents, marsupials and primates. All genera of the family occur in South America,

Economic Importance:

Hosts:

Rodents, and marsupials.

Genera of the Viannaiidae parasitize didelphid marsupials (opossums), rodents of Hystricognathi: Caviidae (capybaras), Ctenomyidae (tuco-tucos), and Cuniculidae (pacas), and members of Primates: Atelidae (howler monkeys) and Cebidae (squirrel monkeys and marmosets) (Ramirez-Canas et al., 2021).

Feeding

Life Cycle:

Damage:

Management:

References:

Beveridge, I., Spratt, D.M. and Durette-Desset, M-C. 2014. Order Strongylida (Railliet and Henry, 1913). In Schmidt-Raesa, A. (ed). Handbook of Zoology: Gastroctricha, Cycloneurelia and Gnathifera. Vol 2. Nematoda. De Gruyter, Berlin

Durette-Desset, M. C. 1983. Keys to genera of the superfamily Trichostrongyloidea. InKeys to the Nematode Parasites of Vertebrates. No. 10, R. C. Anderson and A. G. Chabaud (eds.). Commonwealth Agricultural Bureaux, Farnham Royal, U.K., p. 1�68.

Durette-Desset, M-C., Hugot, J.P., Darlu, P. and Chabaud, A.G. 1999. A cladistic analysis of the Trichostrongyloidea. Int. Jour. Parasitol. 21:579-587.

Ramirez-Canas, S.A., Lopez-Cballero, J.D., Mata-Lopez, R. 2021. Morphological and molecular data eveal two new species of Viannia (Nematoda: Viannaiidae), parasitizing opossums (Mammalia: Didelphidae) in Mexico. J. Parasiitol 107:388-403.

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