spicule

From Latin spīculum.

spicule (plural spicules)

1. A sharp, needle-like piece.
2. (biology) Any of many needle-like crystalline structures that provide skeletal support in marine invertebrates like sponges.
3. A needle-like mating structure found only in male nematodes.
4. (astronomy) A jet of matter ejected from the photosphere of the sun.
5. A small spike of flowers.

• Pulices, clipeus