Figure 33.1 Review of animal phylogeny
Figure 33.2 Sponges
Figure 33.3 Anatomy of a sponge
Figure 33.4 Polyp and medusa forms of cnidarians
Figure 33.4bx Jelly medusa
Figure 33.5 A cnidocyte of a hydra
Table 33.1 Classes of Phylum Cnidaria
Figure 33.6 Cnidarians: Hydrozoans (top left), jelly (top right), sea anemone (bottom left), coral polyps (bottom right)
Figure 33.6bx Purple striped jelly, Pelagia panopyra
Figure 33.6dx Coral polyps
Figure 33.7 The life cycle of the hydrozoan Obelia (Layer 3)
Figure 33.8x2 Ctenophore
Table 33.2 Classes of Phylum Platyhelminthes
Figure 33.9x A flatworm
Figure Anatomy of a planarian
Figure The life history of a blood fluke, Schistosoma mansoni
Figure Anatomy of a tapeworm
Figure Basic body plan of mollusks
Table 33.3 Major Classes of Phylum Mollusca
Figure A chiton
Figure The results of torsion in a gastropod
Figure 33.18x Garden snail
Figure Gastropods: Nudibranchs (top left and bottom left), terrestrial snail (bottom left), deer cowrie (bottom right)
Figure A bivalve: Scallop
Figure Anatomy of a clam
Figure Cephalopods: Squid (top left and bottom left), nautilus (top right), octopus (bottom right)
Figure Anatomy of an earthworm
Figure 33.23x External anatomy of an earthworm
Table 33.4 Classes of Phylum Annelida
Figure Annelids, the segmented worms: Polychaete (left), feather-duster worm (middle), leech (right)
Figure 33.24cx Christmas-tree worms
Figure 33.25ax Nematode, C. elegans
Figure 33.25b Parasite nematode, Trichinella spiralis
Figure External anatomy of an arthropod
Table 33.5 Some Major Arthropod Classes
Figure A trilobite fossil
Figure Horseshoe crabs, Limulus polyphemus
Figure Arachnids: Scorpion (left), honeybee air tube filled with parasitic mites (right)
Figure 33.30b Spider anatomy
Figure 33.30x Lycosid spider: female with offspring
Figure 33.31a Class Dipolopoda (millipedes)
Figure Insect flight, dragonfly
Figure 33.x1 Insecta: beetle
Figure Metamorphosis of a butterfly
Figure Crustaceans: Lobster (top left), banded coral shrimp (bottom left), barnacles (right)
Figure 33.0 Ochre sea stars, Pisaster ochraceus
Figure Anatomy of a sea star
Figure Echinoderms: Sea star (top left), brittle star (top right), sea urchin (bottom left), sea lily (bottom right),