Phylum CNIDARIA (II):
(Cnidaria study images;
|
Phase or trait | Cl. Hydrozoa | Cl. Scyphozoa | Cl. Anthozoa | Both polyp & medusa phase present? |
yes (most) | yes (most) | no (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 (no cnidocytes) |
complex (with cnidocytes) |
- - - | - gastrovascular canals | unbranched | branched | - - - | - gastric filaments
with cnidocytes |
no | yes | - - - | - prey capture | mainly tentacles |
manubrium + tentacles |
- - - | Gonads | ectodermal | endodermal | endodermal | Habitat | mostly marine, some freshwater |
marine only |
marine only |
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Copyright (c) 2005 by A. Richard Palmer. All rights reserved.
(revised Feb. 5, 2005)