VPA 221: Veterinary Entomology and Acarology (1+1)

Description of the larvae

DESCRIPTION OF THE LARVAE - SHEEP NASAL FLIES

• The first stage larvae is whitish in colour
• The mature third stage larvae is large, around 3 cms long, with black oral hooks,  dark black bands on all the segments on the dorsal aspect 
• On the ventral aspect they have small rows of rose thorn shaped spines
• The posterior end of the larvae appears large and truncated and the posterior spiracles are very clearly visible 
• The spiracles are brown, ‘D’ shaped with radiating slits