Invertebrate's
Porifera
Examples: Sponges
Means pore bearing
Sessile
Cnidaria
Cnidcytes: Cells that contain stinging
Two body forms: Polyp, Sessile
Radial Symmetry
Platyhelminthes
Examples: Flatworms, tapeworms
Many parasitic forms
Bilateral Symmetry
Mollusca
Examples: snails, clams, octopus, squid
Has Mantle
Has muscular foot/tentacles
Annelida
Examples: segmented worms, earth worms, leeches
Body divided into segments
Closed circulatory system
Arthropoda
Largest phylum
Paired, jointed appendages
Open circulatory system
Echinodermata
Comparing Invertebrates
Centipede and Millipedes
Most primitive arthropods
Two body regions: cephalothorax
Over 75% of all animal species
Phylum Echinodermata
Radial symmetry
Water vascular system