CRUSTACEA

• Phylum Arthopoda• Subphylum Crustacea• 30,000 species•Mostly marine

Examples of Crustaceans

Crabs

Examples of Crustaceans

Shrimp

Examples of Crustaceans

Lobster

Examples of CrustaceansBarnacles

Examples of Crustaceans

Copepods – 70% of all Crustaceans

Examples of Crustaceans

Krill – greatest biomass of any species on earth

Examples of Crustaceans

Isopods

Examples of Crustaceans

Amphipods

ANATOMY

• Anatomy varies depending on type of crustacean

• Body divided into two major parts:Cephalothorax – head and main body cavityAbdomen – muscular, segmented dorsal part of

body

• Usually 16 – 20 body segments• Carapace – shell covering cephalothorax

cephalothorax

abdomen

carapace

ANATOMY

• Many specialized, jointed appendages:– Gills – usually underneath for breathing– Walking legs - pereopods– Swimming legs - pleopods– Feeding appendages

• maxillipeds and mandibles - mouthparts• chela - claws

– Sensing - antennae– Defense– Tail – telson and uropods

pereopodsgills pleopods

antennae

chela

eye

telson

shrimp anatomy

uropods

antennachela eye

walking legs

abdomenswimming

legs

carapace

crab anatomy – dorsal view

mandibleschela eye

abdomen

crab anatomy –ventral view

Crustacean Feeding

• Methods vary:• Predators and scavengers – crabs and lobsters• Filter feeders – barnacles• Parasites – isopods (fish lice), whales

barnacles

Crustacean Reproduction

• Separate sexes• Males release sperm packetusing modified appendages• Females mate during molting – hold sperm packet untilfertilization• Females carry fertilized eggs under abdomen until hatching

Crustacean Life Cycle

• Meroplanktonic larvae

Other Facts

• Largest – king crab – legspan of 12 feet• Heaviest – 48 pound lobster