Phylum CNIDARIA (II): (Cnidaria study images; |
Phase or trait | Cl. Hydrozoa | Cl. Scyphozoa | Cl. Anthozoa | Both polyp & medusa phase present? | yes | yes (most) | polyp only | - medusa by | budding | strobilation | - - - | Polyp phase: | - mouth | simple | simple | tubular pharynx | - gastrovasc. septae | no | yes | yes | - gastric filaments with cnidocytes | no | yes | yes | Medusa phase: | - velum | present | absent | - - - | - bell margin | simple | notched (rhopalia) | - - - | - manubrium | simple | complex | - - - | - gastrovasc. canals | unbranched | branched | - - - | - gastric filaments with cnidocytes | no | yes | - - - | - prey capture | mainly tentacles | manubrium + tentacles | - - - | Gonads | ectodermal (epidermis) | endodermal (gastrodermis) | endodermal (gastrodermis) | Habitat | mostly marine, some freshwater | marine only | marine only |
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(revised Feb. 3, 2002)