Date post: | 19-Oct-2014 |
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Technology |
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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