biol 2 invertebrates

Class polyplacophora

Chitons

Class Cephalopoda

Octopus, cuttlefish, squid, nautilus

Class Bivalvia

Bivalves

Class Gastropoda

Snails and slugs

Radula in mollusca

Rasping radula in all Classes except Bivalvia

Used to breakdown food (mouth)

Phylum Arthropoda

The most diverse animal phylum

What are the key morphological features?

Articulated exoskeleton, jointed paired appendages, individual cross-striated muscles, head of 5 segments

Subphylum Chelicerata

Horseshoe crabs

Related to dinosaurs

Go through ecdysis which is molting of the outer layer of skin

Subphylum Crustacea

Possess 3 tagmata: Head, Thorax, abdomen

Crabs, Lobster, Crayfish

Subphylum Hexapoda

Have 3 tagmata

Beetles, flies, butterflies, and fleas

Subphylum Myriapoda (centipedes)

Carnivorous, one pair of legs per segment

Subphylum Myriapoda (millipedes)

Detritivores, two pairs of legs per segment

What are the two life stages of cnidarians?

Polyp and medusa

Phylum porifera

Sponges

Phylum Cnidaria

Jellyfish, sea anemones, corals

Phylum platyhelminthes

Flatworms

Phylum Nematoda

Roundworms

Phylum Annelida

Segmented worms, earthworms