Ostertagia		Contents		Rev 03/10/2025
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Ostertagia Menu				Ecosystem Functions and Services
		Distribution		Management
Return to Haemonchidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go to Dictionary of Terminology

Classification

Chromadorea

Chromadoria

Rhabditida

  Rhabditina

   Trichostronglyloidea

    Haemonchidae

Ostertagiinae

Ostertagia Ransom, 1907

Type species of the genus: Ostertagia ostertagi (Stiles, 1892) Ransom, 1907

Synonyms:

Strongylus ostertagi, Stiles, 1892

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Morphology and Anatomy:

Based on molecular analyses, Ostertagia and Orloffia are considered close but independent genera (Kuznetsov, 2011).

• 	Female: Male:

..

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Distribution

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Economic Importance:

Ostertagia ostertagi is the causal agent of ostertagiasis, one of the most important nematode parasitic diseasaes of young cattle.

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Hosts:

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Feeding

Many of the species are parasites of the abomasa and small intestine of ruminants.

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Life Cycle:

Life cycle direct, no intermediate host. From studies in cattle, it appears that young calves slowly develop an incomplete  immunity to O. ostertagi (Michel, 1963)

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Damage:

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Management:

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References:

Beveridge, I., Spratt, D.M., Durette-Desset, M-C. 2013. Order Strongylida (Railliet & Henry, 1913). Handbook Of Zoology Online. De Gruyter

Drozdz, J., 1995. Polymorphism in the Ostertagiinae Lopez Neyra, 1947 and Comments on the Systematics of These Nematodes, Syst. Parasitol., 1995, 32:91-99.

Kuznetsov, D.N. 2011. Taxonomic Revision of the Genus Ostertagia (Nematoda: Ostertagiinae) Based on an ITS2 rDNA Study. Biology Bulletin, 38:608-614. Original Russian Text: Kuznetsov, D.N. 2011, in Izvestiya Akademii Nauk, Seriya Biologicheskaya, 2011, 6: 710-16.

Michel JF. 1963. The phenomena of host resistance and the course of infection of Ostertagia ostertagi in calves. Parasitology. 1963;53(1-2):63-84. doi:10.1017/S0031182000072541

Ransom. B.H. 1907. Notes of Parasitic Nematodes, Including Descriptions of New Genera and Species and Observations on Life Histories. US Govwernment Printing Office 7pp.

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