Date post: | 18-Nov-2014 |
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Major Marine Invertebrate Phyla
SYMMETRY
pentamerous radial symmetry
Phylum Porifera
• Example: sponges• No symmetry = asymmetrical• Simplest animals• No organs or true tissues• Many pores
Phylum Cnidaria
• Examples: jellyfish, corals, anemones, hydra• Radial symmetry• The stingers• Two tissue layers• No organs
Phylum Ctenophora
• Examples: comb jellies• Radial symmetry• Harmless bioluminescent jellies
Phylum Platyhelminthes
• Examples: flatworms• Bilateral symmetry• Simple marine worms
Phylum Annelida
• Examples: polychaete worms, earthworm• Bilateral symmetry• Advanced marine worms• Segmented bodies
Phylum Mollusca
• Examples: clam, snail, octopus, squid• Bilateral symmetry• Soft-bodied invertebrates with large “foot”
Phylum Arthropoda
• Examples: crab, shrimp, lobster, insects, arachnids
• Bilateral symmetry• Exoskeleton• Segmented body with jointed appendages
Phylum Echinodermata• Examples: sea stars, sea urchins, sea
cucumbers• Pentamerous radial symmetry• The “stars”• Spiny skin