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Oceanography Phylums and Classifications

Hints
Across
Internal organs, bilateral symmetry, cephalization
Deuterostome development, endoskeleton
Snails
Seastars
clams, oysters, scallops
Down
the most highly evolved mollusks. octopus, squid, nautilus, cuttle fish
Ray-fin and lobe-fin fish
Sharks, skates, rays
Multicellularity
Coelom
Jointed appendages, exoskeleton
Body cavity
Radial symmetry, extra cellular digestion, specialized tissues
Notochord
Segmentation
principal taxonomic category that ranks above class and below kingdom