Having a dimorphous life history divided into medusa and polyp body plans, for 10 points, name this phylum named for the stinging cells of its members, which include anemones and jellyfish.
This phlyum's members can have a larval stage as planulae, and some use velaria for locomotion. This phylum utilizes a body plan consisting of a gastrodermis surrounded by mesoglea, and it is divided into classes Scyphozoa, Anthozoa, and Hydrozoa, which contains one of the only freshwater animals in this phylum, the hydra. Like echinoderms and ctenophores, members of this phylum have nerve nets, and its members use cells that eject coiled thread weapons called nematocysts. Having a dimorphous life history divided into medusa and polyp body plans, for 10 points, name this phylum named for the stinging cells of its members, which include anemones and jellyfish.
This phlyum's members can have a larval stage as planulae, and some use velaria for locomotion.
{Cnidarians}