Studies on the Onchocerca (Nematoda: Filarioidea) Found in Cattle in the United States. I. Systematics of O. gutturosa and O. lienalis with a Description of O. stilesi sp. n.

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Abstract
O. gutturosa and O. lienalis are redescribed and comparative morphological descriptions provided. Described from cattle in the USA is O. stilesi sp. nov. It localizes in the connective tissues around the stifle joint, and can be distinguished morphologically from O. gutterosa and O. lienalis. O. gutturosa and O. lienalis apparently have widespread distribution in the eastern USA; O. stilesi has been reported only from Minnesota.