Rev 01/03/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Dujardinascaris menu Ecosystem Functions and Services
Distribution Management
Return to Heterocheilidae Menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology







                          Dujardinascaris Baylis, 1947


The genus Dujardinascaris  includes more than 20 species of reptile and fish parasites. All Dujardinascaris spp. are considered host specific; 18 species parasitize exclusively crocodilians and at least two species parasitize fish.

Back to Top

Morphology and Anatomy:


Ref. Masova et al., 2014; Sprent, 1977

Body size range for the species of this genus in the database - Click:
Back to Top



Back to Top

Economic Importance:

When feeding causes ulceration of the host digestive system, they are considered of economic importance in crocodile farming (Masova et al., 2014).

Back to Top


Dujardinascaris spp. are host specific; 18 species parasitize exclusively crocodilians and two species parasitize fish (Sprent 1977; Sprent et al. 1998; Machida et al. 1992, Moravec & Jirku, 2014).

In Africa and Madagascar, five Dujardinascaris spp. ( D. dujardini, D. gedoelsti, D. puylaerti, D. petterae, and D. madagascariensis) are reported in the Nile crocodile (Crocodylus niloticus), African slender snouted crocodile (Mecistops cataphractus) and the African dwarf crocodile (Osteolaemus tetraspis) (Travassos, 1920, Sprent, 1977, Sprent et al., 1998, Chabaud & Caballero, 1966, Masova et al., 2014).

Reported from both the families Crocodilidae and Alligatoridae.


Back to Top


Usually found as parasites in the stomach leading to gastric ulceration

Back to Top

Life Cycle

For Ecophysiological Parameters for this genus, click 
Back to Top


Nematode infections in crocodilians are usually conaidered asymptomatic but when they cause ulceration they may reduce host fitness and are considered of economic importance in crocodile farming (Masova et al., 2014).


Back to Top


Back to Top


Chabaud, A.G. & Caballero, R. 1966. Phenomene de subspeciation chez un ascaride parasite de Crocodilus niloticus a Madagascar. Bulletin du Muséum national d'histoire naturelle, 38: 687-689.

Masova, S., Barus, V., Seifertova, M., Malaca, J. 2014. Redescription and molecular characterisation of Dujardinascaris madagascariensis and a note on D. dujardini (Nematoda: Heterocheilidae), parasites of Crocodylus niloticus, with a key to Dujardinascaris spp. in crocodilians. Zootaxa 3893:261-276.

Machida, M., Araki, J., Regoniel, P.A., Pontillas, F.A. & Kurata, Y. 1992. Three species of ascaridoid nematodes from crocodiles in the Philippines. Bulletin of the National Science Museum, Series A (Zoology), 18: 95-102.

Moravec, F & Jirku, M. 2014. Dujardinascaris mormyropsis n. sp. (Nematoda: Anisakidae) from the osteoglossiform fish Mormyrops anguilloides (Linnaeus) (Mormyridae) in Central Africa. Systematic parasitology, 88: 55-62.

Sprent, J.F.A. 1977. Ascaridoid nematodes of amphibians and reptiles: Dujardinascaris. Journal of Helminthology, 51: 253-287.

 Sprent, J.F.A., McKeown, E.A. & Cremin, M. 1998. Dujardinascaris spp. (Nematoda: Ascaridoidea) in Old World crocodilians. Systematic Parasitology, 39: 209-222.

Travassos, L. 1933. Ascarides des crocodiles Sud-Americains. Comptes Rendus des Seances de la Societe de Biologie et des ses Filiales, 114:833-834.

Back to Top

Return to Heterocheilidae Menu

Want more information about nematodes? Go to Nemaplex Main Menu.