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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 Crustaceans
Barnacles
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 cavity
  Abdomen – muscular, segmented dorsal part of
    body
• Usually 16 – 20 body segments
• Carapace – shell covering cephalothorax
cephalo
                     thorax




                              ab
                              do
                                 m
                                  en
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
antennae     eye
                       shrimp anatomy


                                    telson




chela                                uropods
                       gills   pleopods
           pereopods
crab anatomy –
                              dorsal view
                    chela eye
       antenna



                 carapace        walking legs



swimming
   legs          abdomen
mandibles   eye
chela
                          crab anatomy –
                            ventral view


        abdomen
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 packet
using modified appendages
• Females mate during molting –
hold sperm packet until
fertilization
• 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

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Crustacean powerpoint