Onchocerca

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A genus of elongated filariform nematodes that inhabit the connective tissue of their hosts, usually within firm nodules in which these parasites are coiled and entangled.

A genus of elongated filariform nematodes that inhabit the connective tissue of their hosts, usually within firm nodules in which they are coiled and entangled.

A genus of nematode parasites in the family Onchocercidae. They are important as causes of onchocercosis. Their life cycles depend on the carriage of larval microfilariae by a variety of insects, chiefly mosquitoes, black flies and midges (families Simuliidae and Ceratopogonidae). The microfilariae are found in the lymph and connective tissue spaces of the skin. Called also Wehrdikmansia.

• O. armillata — the microfilariae are found in the skin of the hump, withers, neck, dewlap and umbilicus and the adults in the aorta of cattle, buffalo, sheep, goats and donkeys.
• O. bohmi — see elaeophora bohmi.
• O. cebei — found in nodules on the brisket and the lateral aspects of the hindlimbs of buffalo. Called also O. sweetae.
• O. cervicalis — found in the ligamentum nuchae of the horse and mule. The microfilariae are commonest in the area of the linea alba. Etiologically related to the occurrence of fistulous withers, poll evil, equine conjunctivitis and possibly equine recurrent ophthalmitis.
• O. cervipedis — found in the subcutaneous tissues of the neck and limbs of deer.
• O. dukei — adults are found in nodules in subcutaneous and perimuscular sites in cattle, mostly in the thorax, abdomen, diaphragm and thighs.
• O. flexuosa — occurs in deer.
• O. garmsi — parasites of deer.
• O. gibsoni — found in nodules under the skin of the brisket or the lateral aspect of the hindlimbs of Bos taurus and Bos indicus cattle.
• O. gutturosa — found in cattle and buffalo in the ligamentum nuchae, on the scapular cartilage and in the hip, shoulder and stifle areas.
• O. lienalis — found in the gastrosplenic ligament, on the capsule of the spleen and above the xiphisternum in cattle.
• O. ochengi — found in cattle, in nodules in cutaneous and subcutaneous sites on the udder, scrotum and flanks.
• O. raillieti — adult worms are found in the ligamentum nuchae, in subcutaneous cysts on the penis and in perimuscular connective tissue of donkeys.
• O. reticulata — a parasite of horses, mules and donkeys. Adult worms are found in the connective tissue of flexor tendons and suspensory ligament of the fetlock, mostly in the forelimb.
• O. rugosicauda — found in the subcutaneous fascia in the shoulders and back of roe deer.
• O. sweetae — see O. cebei (above).
• O. synceri — found in subcutaneous tissues in African buffalo.
• O. tarsicola — a parasite of deer.
• O. tubingensis — a parasite of deer.
• O. volvulus — causes dermatitis and ocular disease in humans.