The Anatomy and Venom-Emitting Mechanism of the Globiferous Pedicellariae of the Urchin Parechinus Angulosus (Leske) With Notes on Their Behaviour

Abstract

Pedicellariae are appendages of the test peculiar to the echinoderm classes Echinoidea (sea-urchins) and Asteroidea (star-fish), and are best developed and always present in the former. In echinoids they are present in large numbers between the spines and on the peristome. There are four kinds of echinoid pedicellariae, although variations of these basic types also occur.