From ZooTerms (Dictionary of Invertebrate Zoology)
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style also stylus (noun; plural styli; Greek stylos, pillar): 1. (Arthropoda: Chelicerata) The embolus of spiders.

2. (Arthropoda: Crustacea) see telson.

3. (Arthropoda: Insecta) a. Any slender, tubular or spinelike appendage at the end of the abdomen. b. In some Diptera, a bristlelike process at the terminal segment of the antenna.

4. (Bryozoa: Stenolaemata) A general term for a rodlike skeletal structure forming a spinose projection on the zoarial surface; canaliculus; stylet

See also: acanthopore. 5. (Cnidaria: Hydrozoa) A calcareous projection. 6. (Mollusca) see crystalline style. 7. (Porifera) A monactinal spicule dissimilar at the two ends