Phylum CNIDARIA (II):
(Cnidaria study images;
|
  | Cl. Hydrozoa | Cl. Scyphozoa | Cl. Anthozoa | Both polyp & medusa phase? | yes (most) | yes (most) | no (polyp only) | - medusa by | budding | strobilation | - - - | Polyp phase: | - polyp form | cylindrical | funnel shaped | cylindrical | - mouth | simple | simple | tubular pharynx | - gastrovasc. septae | no | yes (some) | yes | - gastric filaments
with cnidocytes |
no | yes | yes | - tentacle form | solid | solid | hollow | Medusa phase: | - velum | present | absent | - - - | - bell margin | simple | notched (rhopalia*) |
- - - | - manubrium | simple (no cnidocytes) |
complex (mouth lobes + cnidocytes) |
- - - | - gastrovascular canals | unbranched | branched | - - - | - gastric filaments
with cnidocytes |
no | yes | - - - | - prey capture | mainly tentacles |
manubrium + tentacles |
- - - | Gonads | epidermal | gastrodermal | gastrodermal | Habitat | mostly marine, some freshwater |
marine only |
marine only |
MtDNA form | linear | linear | circular |
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Copyright (c) 2009 by A. Richard Palmer. All rights reserved.
(revised Dec. 28, 2008)