annular spiracle

annular spiracle
1. In immature Lepidoptera and Hymenoptera, simple, ring-like spiracles with a single opening with no accessory chambers.
2. In other immature insects, may be biforous, having two small or large accessory or secondary chambers usually adjacent to the margin; uniforous, when opening occurs on the margin, or multiforous if three or more openings are present.

Online Dictionary of Invertebrate Zoology. . 2005.

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