From ZooTerms (Dictionary of Invertebrate Zoology)
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stylet (noun; Greek stylos, pillar): 1. Any small rigid bristle or needlelike appendage or organ.

2. (Arthropoda: Crustacea) see caudal ramus.

3. (Arthropoda: Insecta) One of the piercing structures in the sucking mouth parts; the shaft of the ovipositor.

4. (Bryozoa: Stenolaemata) A rodlike skeletal structure oriented almost perpendicular to the zoarial surface and parallel to the zooecia.

5. (Cnidaria) The large, lowermost thorn on the hampe (butt) of a stenotele nematocyst.

6. (NEMATA) A sclerotized, usually hollow, structure used for feeding, releasing secretions and entering plants and animals (Arthropoda); a spear

See also: stomatostyle, odontostyle. 7. (Nemertina) A nail-shaped structure on the end of the proboscis that typically reaches 50-200 m, used in the capture of prey.