Download - Phylum Arthropoda class Crustacea Largest phylum of animals w/ approx One million known species
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Phylum Arthropodaclass
Crustacea
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Largest phylum of animals w/ approxOne million known species
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Includes: insects, spiders, crabsBarnacles, shrimp, & lobsters
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General characteristics• Bilaterally symmetric• Have jointed appendages (legs &
mouth parts)• Exoskeleton made of chitin and
hardened by CaCO3• Grow by molting
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• Molting:• Old exoskeleton is shed leaving
the animal soft• The animal brings in water to
expand itself• A new exoskeleton is secreted
by specialized tissue
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• Exoskeleton provides protection, support, & flexibility• Also imposes
limitations to grow & size
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Class: Crustacea
• 30,000 species primarily marine• Gill-breathing• 16-20 segments• Open circulatory system• Specialized appendages for food gathering, walking,
fighting, defense, etc.• Start out life as a planktonic larvae• Ex: lobsters, crayfish, shrimp, crabs, copepods,
barnacles, etc.• Giant King Crab = largest crustacean (~12ft)• Heaviest is the lobsters (up to 48 lbs!!)
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• Have two pairs of antennae (one pair smaller than the other)• Small, planktonic crustaceans
include copepods,
• barnacles, isopods, krill
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Barnacles
• Chitin exoskeleton & secretes CaCO3 shell.
• Feathery feet for filter feeding plankton• Some attach to docks or boats and a few on
whales• Must close up with an operculum during low
tide to avoid desiccation (drying up).
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Barnacles and Crabs • http://www.youtube.com/watch?v=VKhY-gLGPCk&safety_mode=true&persis
t_safety_mode=1&safe=active
• Barnacle info• http://www.youtube.com/watch?v=49Aev-HA9R4&safety_mode=true&persis
t_safety_mode=1&safe=active
• Giant Crabs• http://www.youtube.com/watch?v=aPJ74X_J_-4&safety_mode=true&persist_
safety_mode=1&safe=active
• Horseshoe Crabs• http://www.youtube.com/watch?v=e8KlAmtIu1E&safety_mode=true&persist
_safety_mode=1&safe=active
• Molting horseshoe crab• http://www.youtube.com/watch?v=Daz8nkh-pWM&safety_mode=true&persi
st_safety_mode=1&safe=active
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• Other larger crustaceans include shrimp, lobsters & crabs• Considered decapods (5 pairs of
legs)• Body consists of cephalothorax
(fused head & thorax) & abdomen
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• Crabs have a compact abdomen & a broad cephalothorax• Abdomen usually
tucked under
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Male
Female
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Abdomen with eggs
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Lobsters• http://www.youtube.com/watch?
feature=endscreen&v=d5uQ317Osxw&NR=1&safety_mode=true&persist_safety_mode=1&safe=active
• Slipper lobster• http://www.youtube.com/watch?
v=8gBtsboSkOU&safety_mode=true&persist_safety_mode=1&safe=active
• Spiny Lobster• http://www.youtube.com/watch?
v=o2QDJwOIa7s&safety_mode=true&persist_safety_mode=1&safe=active
• Lobster Life Cycle: Safari Montage
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Giant Spider Crab
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King and Coconut Crabs