Stomach Worms of Equids
Greek: habros = smooth, thin; trichos = tiny hair; nema = filament. Latin: musca = fly; maior = larger; megastoma = large mouth; microstoma = small mouth; axis = axis. English: Stomach worms. Drasche, Richard (1850–1923) Austrian Scientist.
Worldwide; in farmed animals local epidemics occur.
Habronema muscae; H. majus (syn. microstoma); reach a length of 25 mm (♀) and 15 mm (♂).
Draschia megastoma: ♀ = 13 mm, ♂ = 10 mm.
Trichostrongylus axei: ♀ = 8 mm; ♂ = 6 mm.
Habronema and Draschia live in nodules in the stomach wall or are attached there in the mucous layer (Trichostrongylus). The females excrete embryonated eggs (Trichostrongylus), larvae-containing eggs (Habronema), or already free larvae (Draschia), which all can be found in the feces of the hosts. For Habronema and Draschia, fly larvae (e.g., Musca) are used as intermediate hosts, which as adults transmit the infectious larvae 3 onto the lips of horses. Trichostron...