Pedicellaria

Definition

Pedicellaria are small, pincer-like appendages found on the surface of echinoderms, such as sea stars and sea urchins. They function in defense and cleaning by removing debris and deterring predators.

5 Must Know Facts For Your Next Test

1. Pedicellariae are primarily found in echinoderms, a group within the superphylum Deuterostomia.
2. They can be either sessile or stalked, depending on their location and function.
3. Pedicellariae play a crucial role in preventing the settlement of parasites and algae on the echinoderm's body.
4. Some pedicellariae have venomous properties to enhance their defensive capabilities.
5. The structure of pedicellariae consists of three movable ossicles that function like jaws.

Review Questions

Related terms

Echinoderm: Members of a phylum of marine animals characterized by radial symmetry and a calcareous skeleton.

Ossicle: Small calcareous elements that make up part of the internal skeleton or test of echinoderms.

Deuterostomia:

A superphylum that includes animals in which the anus develops from the first opening in the embryo, with examples including chordates and echinoderms.