GENERAL HISTOLOGY

Detailed explanation-1: -Pedicellariae are minute stalked appendages that are found in among the spines of echinoids. They consist of a thin stalk, generally supported by a simple calcite rod, and a tulip-like head which is composed of three (rarely two) valves, each supported by an internal calcitic frame.

Detailed explanation-2: -A pedicellaria (plural: pedicellariae) is a small wrench-or claw-shaped appendage with movable jaws, called valves, commonly found on echinoderms (phylum Echinodermata), particularly in sea stars (class Asteroidea) and sea urchins (class Echinoidea).

Detailed explanation-3: -These are used for cover, especially against small animals and larvae which will choose the body surface thereby keeping the body surface freed from debris. They’ll also help in capturing small prey.

Detailed explanation-4: -Pedicellariae are found only in echinoderms, particularly sea stars and sea urchins. The type found on collector urchins are known as globiferous, meaning they have a three-pronged jaw and a venom sac at the end of a long stalk.