Flies Flashcards
Hypoderma spp - H bovis/H linatum (cattle grubs, heel flies)
1 year life cycles
larvae hatch, crawld down hair shaft, penetrate skin, migrate through SQ tissues - rest in submucosal CT of esophagus - LINEATUM or epidural fat (BOVIS) - migrate to SQ tissues of back - create breathing holes - exit and pupate on ground
carcass damage
treating when at resting site - bloat/choak or CNS damage
Cochliomyia hominovorax (American primary screwworm)
attracted to uncontaminated skin wounds of domestic animals
adult lay eggs at edge of wound
larvae enter wound feed on secretions and living flesh, pupate in soil
fatal if not treated
females mate only once - massive eradication efforts
occasionally re-enters US in imported animals - REPORTABLE
Gasterophilus spp (G. nasalis, G. hemorrhoidalis, G intestinalis)
nasalis - intermandibular space, lips - hemorrhoidalis, intestinalis - forelegs and shoulders
hatch in response to warmth from breath
larvae penetrate/migrate in oral mucosa to tongue - stomach - attach to wall - pass out in feces - pupate in soil
benign - stomatitis/ulceration of tongue
Oestrus ovis (sheep nasal bot)
fly around nostrils and squirt larvae at the nostrils during flight
larvae crawl into nasal sinuses - sneezed out - pupate in ground
purulent rhinitis/sinusitis - head shaking, restlessness, snorting
