Acicula (: aciculum) are strong, stout internal

chaeta A chaeta or cheta (; ) is a chitinous bristle or seta found on annelid worms, although the term is also frequently used to describe similar structures in other invertebrates such as arthropods. Polychaete annelids (''polychaeta'' literally me ...

e that provide support to parapodia in polychaete annelids. Arctonoe sp

References

{{reflist Annelid anatomy