What are the 3 types of sponges?
glass
chalk
commercial
What are glass sponge?
silicon spicules & spongin for support
What are chalk sponge?
calcium carbonate spicules & spongin
What are commercial sponge?
no spicules - spongin only
What are sponge spicules?
structural support for sponge
Jellyfish, corals, hydrozoans are in which phylum?
cnidaria
What does the body structure of cnidaria consist of?
tentacles stinging cells (nematocysts) 2 layers of tissues (epidermis & gastrodermis) mesoglea (separates above) nerve net (no ganglia)
Cnidaria consists of what 2 bodies?
medusa - free swimming
polyp - sessile/attached
Jellyfish is an example of what kind body?
medusa
Corals are an example of what kind of body?
polyp