Scanning electron microscopy of larval instars and imago of Oestrus caucasicus (Grunin, 1948) (Diptera: Oestridae)

摘要

Oestrus caucasicus (Grunin, 1948) is a larval parasite of the nasal cavities of Capra caucasica, Capra ibex and Capra pyrenaica. This study is the first description of the parasite using scanning electron microscopy. The first larval instar shows minor differences with Oestrus ovis. The second larval instar shows important synapomorphic features common to Oestrus ovis but, also, distinctive features as the spines-crown or the currycomb-shaped spines. The third larval instar shows many differences with Oestrus ovis, mostly in the ventral and dorsal spines. The imagos of the two species have closely related morphologies. This study is a contribution to a revision of phylogeny of Oestridae family.