Stephanofilaria stilesi

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Stephanofilaira stilesi
Class Nematoda
Super-family Filarioidea


Intermediate hosts: The horn fly, Haematobia irritans

Definitive hosts: Cattle


These small nematodes are between 3-6mm in length. The eggs have thin shells, and are around 65μm in length. The microfilaria are 50μm long and enclosed in a spherical, vitelline membrane.


Horn flies feed on lesions found on the host skin, and ingest microfilariae, as they feed on cutaneous lesions. They later develop into L3 in around 18-21 days. The definitive host is infected when the fly leaves the L3 on the host.

Causes Stephanofilariasis.

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