From ZooTerms (Dictionary of Invertebrate Zoology)
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canaliculus (noun; plural canaliculi; Latin diminutive canalis, channel): 1. A minute canal.

2. (Arthropoda: Insecta) In Lepidoptera, an elongate sclerotized structure that functions as a support or guide for the aedeagus.

3. (Bryozoa: Stenolaemata) The large style inflecting septumlike projections into the zooecial chamber parallel to the length.