Definitions
from The Century Dictionary.
- noun A bladder-like expansion of the head of nearly half of the dipterous insects when just emerged from the puparium. It is capable of great dilation and is probably of service in helping to rupture the puparium. It disappears after emergence, and its position is represented by the lunula.
Etymologies
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Examples
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Head vesicle: in Diptera, = ptilinum, q.v. Heart: the dorsal vessel or tubular structure divided into chambers, lying just beneath the dorsal, which serves to propel the blood and controls the circulation.
Explanation of Terms Used in Entomology John. B. Smith
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