Phylogeny of the Oestridae
It may be assumed that the ancestral stock from which the Oestridae evolved should present the following characters: pilosity undeveloped; reduced chaetotaxy; eyes and antennae of normal size; antennal fovea shallow, without a median carina; reduced mouthparts; postscutellum undeveloped; wings with cell R5 open and M2 present as a stump vein. As to the larvae, the 1st stage should be spindle-shaped, the body segments covered by several rows of spines, the arrangement of these rows being almost identical on the dorsal and ventral surfaces of the body; the posterior spiracle was a porous plate.
KeywordsAbdominal Segment Porous Plate Wing Shape Aggregation Site Continental Drift
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