Practice question

Cnidarian body forms include sessile polyp cylindrical with oral disc and pelagic medusa bell-shaped. Dominant medusa stage large free-swimming gelatinous with thick mesoglea prominent gonads within gastrodermis, nerve ring with sensory rhopalia found in Scyphozoa true jellyfishes where scyphomedusa develops from scyphistoma via strobilation producing ephyrae larvae and Cubozoa box jellies with cuboidal bell potent venom. Medusa is primary reproductive adult. Hydrozoa mostly polyp dominant except hydromedusae Anthozoa exclusively polypoid lacking medusa adapting mostly benthic predatory lifestyle with varying coloniality and skeletal deposition in reef environments globally widely distributed and ecologically important as predators and habitat builders.