Plankton
• Organisms that drift with the currents
Zooplankton
• Animal plankton – many different types
• Heterotrophic – primary consumers
Zooplankton
• Major type – copepods– Small crustacean
Plankton-
Copepods
Zooplankton
• Holoplankton– Spend their entire life in plankton
Zooplankton
• Meroplankton– Only found in plankton for part of their life
cycle– Larvae of benthic adults
Animal Kingdom
• Classify similar animals into Phyla
• 36 Animal Phyla – Only 1 has vertebrates
Invertebrates
• Animals without backbones
• No internal rigid skeleton
• Softbodied
• Many have hard external coverings
Phylum Cnidaria -
CORAL
Phylum Arthropoda - Crustaceans
• Crabs, lobster, shrimp, barnacles, copepods
Phylum Arthropoda
Class Crustacea
Phylum Mollusca
• 3 Main groups– Gastropods - snails– Bivalves- oysters, clams, mussels– Cephalopods – octopuses, squids
Gastropods
• Spiral shells
• Shell-less = sea slugs or nudibranchs
• Project head and muscular foot when moving
Bivalves
• Twin, hinged shells
• not very mobile
• Suspension feeders
• Gills for gas exchange
Cephalopods
• Largest of the invertebrates (59 ft squid)
• Foot modified into tentacles
• Active predators
• Highly evolved nervous system
Phylum Mollusca – Class Cephalopoda- CUTTLEFISH
Phylum Echinodermata
• Sea stars, sand dollars, brittle stars, sea urchins
Phylum
Echinodermata