One species in this phylum has a set of large teeth arranged in "Aristotle's lantern.
Organisms in this phylum have pincer-like structures called pedicellariae (PED-ee-sell-AIR-ee-ay). One species in this phylum has a set of large teeth arranged in "Aristotle's lantern." Some members of this phylum contain a petalidium, a pattern of ambulacral plates through which tube feet project. A sieve plate called a madreporite is the entry point to the (*) water vascular system, which serves as the respiratory system for most members of this phylum. For 10 points, name this phylum in which adults have pentaradial symmetry, which includes sea urchins, sea cucumbers, and starfish.
Organisms in this phylum have pincer-like structures called pedicellariae (PED-ee-sell-AIR-ee-ay).
{Echinodermata} [or {echinoderms}]