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Arthropods
Animals with jointed appendages
General Characteristics of
Arthropods
 Most successful
phylum of animals


jointed appendages
Exoskeleton
 exoskeleton


protein + chitin
molting
 two marine groups:


chelicerates
mandibulates
Crabzilla a 100 year old crab
Living in an England Aquarium
Horseshoe crab North Shore,LI
Chelicerates
 Chelicerata
 Horseshoe crabs



shallow coastal waters
cephalothorax, abdomen,
telson
Six pairs of appendages
Horseshoe crabs on Long Island
 Can be found on the
North shore on/in the sound
Late May they mate at night
Near the shore.
Sexually mature around 8-10 years of age.
This is a problem because they are
overharvested for bait.
Horseshoe crabs as pets?????
Chelicerates
 Sea spiders

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
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common in polar seas
8-16 walking legs
male carries eggs
feed on invertebrates
with their proboscis
Not true spiders
http://www.youtube.c
om/watch?v=cQOS_
mBlbms&safety_mod
e=true&persist_safety
Ahhhhhhhh
Sea Spiders: Science Fiction based on oceans
marine life.
 http://www.popscreen.com/v/6pa1m/Promet
heus-Giant-Facehugger-Scene-Cuddles
http://www.youtube.com/watch?v=uuapyExYJBI&safety_mode=true&per
Mandibulates
 Have Mandibles
 Mandibulates include
crustaceans

Examples: decapods, krill,
copepods, amphipods, barnacles,
mantis shrimp, lobsters
 head, thorax, abdomen
 walking legs and swimmerettes
 gas exchange through body
surface or gills
 molting decreases as animal
ages
Krill
Blue crab
Fairy
Shrimp
Lobster
Amphipod
Mantis Shrimp
Copepod
Barnacles
Decapods: “ten feet”
 Crabs, lobsters, true shrimp
 5 pair of walking legs, first
pair are chilipeds (pinchers)
 range in size up to 4 meters
(giant spider crab)
 behavioral adaptations


hermit crabs
blue crabs

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Mantis Shrimp
Predators of fish, crabs, shrimp, molluscs
tropical seas up to North Atlantic
rocks or coral crevices or in burrows
second pair of appendages is enlarged with a movable
finger, punch their prey with over 50 mph hits.
Krill
 Krill averages only
about two inches in
length, but it
represents a giantsized link in the
global food chain.
 They are the fuel that
runs the engine of
the Earth’s marine
ecosystems.
Krill feed on phytoplankton, that drift near the ocean’s
surface and live off carbon dioxide and sun’s rays. They
in turn are the main staple in the diets of hundreds of
animals, from fish, to birds, to baleen whales.
http://www.youtube.com/watch?v=01Runa3neb0&featu
re=related&safety_mode=true&persist_safety_mode=1
&safe=active
Amphipods
 3 posterior pairs of appendages
turned backward;look like
shrimp.
 beach fleas are terrestrial but
retained gills, so must stay in
moist sediments.
 Important for the food chain
Copepods
 Most abundant members of
zooplankton;
 important food source
 vertical daily migration
 suspension feeders
primarily, some are
carnivorous and some have
wives that are computers 
Ohhhh Barnacles
 Sessile (do not move)
 exoskeleton of calcium
carbonate
 cirripeds stick out of shell to
filter feed
 larvae with compound eyes
and carapace of two shell
plates. When larvae settles, it
adheres and metamorphoses
into an adult.
Barnacle with legs out feeding
Can you name that Long
Island Arthropod?
7.
5.
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6.
Giant spiny lobster
Lobster decline in NYS
Fisheries. Why?