biforous spiracle
(ARTHROPODA: Insecta)
An immature\'s spiracle having two entrances (air tubes); annular-biforous spiracles.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • annular spiracle — (ARTHROPODA: Insecta) 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… …   Dictionary of invertebrate zoology

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