Arthropods Animals with jointed appendages
Jan 05, 2016
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
CheliceratesChelicerataHorseshoe 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?????
CheliceratesSea spiders
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_mode=true&persist_safety_mode=1&safe=active
Ahhhhhhhh
Sea Spiders: Science Fiction based on oceans marine life.
http://www.popscreen.com/v/6pa1m/Prometheus-Giant-Facehugger-Scene-Cuddles
http://www.youtube.com/watch?v=uuapyExYJBI&safety_mode=true&persist_safety_mode=1&safe=active
MandibulatesHave MandiblesMandibulates include
crustaceans Examples: decapods, krill,
copepods, amphipods, barnacles, mantis shrimp, lobsters
head, thorax, abdomenwalking legs and swimmerettesgas exchange through body
surface or gillsmolting decreases as animal ages
Krill
Blue crab
Lobster
Copepod
Barnacles
Fairy Shrimp
Mantis Shrimp
Amphipod
Decapods: “ten feet”
Crabs, lobsters, true shrimp5 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
Mantis ShrimpPredators of fish, crabs, shrimp, molluscstropical seas up to North Atlanticrocks or coral crevices or in burrowssecond 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 giant-sized 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&feature=related&safety_mode=true&persist_safety_mode=1&safe=active
Amphipods3 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 sourcevertical daily migrationsuspension 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?
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Giant spiny lobster
Lobster decline in NYS Fisheries. Why?