meet the arthropoda
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TRANSCRIPT
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Meet the Arthropods“Jointed Feet”
Kingdom Animalia!
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Anatomy
• External skeleton made of calcium carbonate (Chitin)
• Jointed appendages
• Segmented body that is plankton-sized to a few meters long
• Bilateral symmetry
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Anatomy cont.
• Open circulatory system – internal organs bathed in blood
• Nerve ganglia
• Compound eyes
• Rely on chemical and mechanical sensors (pheromones & antennae)
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Reproduction
• External fertilization
• External development – frequently in pouches, sacks, on parents’ body
• Planktonic larvae
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Phylum ArthropodaTwo Subphyla: A) Subphylum Chelicerata – Sea Spiders & Horseshoe Crabs
B) Subphylum Crustacea – Lobsters, Crabs, Shrimp, Barnacles
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Habitat & Distribution
• Mostly benthic
• Mostly epifauna
• Worldwide
• This phylum contains
• the most species of any on earth
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The only “attached” crustacean
Can you name them?
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1. Subphylum Chelicerataa. Sea Spiders and b. Horseshoe Crabs
Like all Arthropods, they have no bones and grow by molting!
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a. Class Pycnogonida(sea spiders-yipes!)
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b. Class Merostomata
Horseshoe Crabs are True Blue Blooded
Creatures
We have ____________________ to make our blood red
Many crustaceans have hemocyanin, making their blood blue!
http://www.youtube.com/watch?v=e8KlAmtIu1E
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Male Horseshoe
Crabs Have
Modified Front Legs That Look
Like Boxing
Gloves or Baseball Mitts to
Help Hold onto the Female During Mating
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http://horseshoe-crabs.com/horseshoe-crabs-life-cycle-on-video/
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2. Subphylum – Crustacea – Lobsters, Crabs, and Shrimp – oh my!
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Crustacean Diversity
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More Crustaceans:the sea insects
Scuds, Beach Hoppers, Beach Fleas, and Skeleton Shrimp:
The Amphipods
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Still that familiar meroplanktonic
larvae we know and love! Special Name:
Zoea
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Still No Skeleton – Molting Instead
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The Smallest, Most Abundant Crustacean in the World’s
Oceans:
The Little Copepod
??What’s the largest planktonic Crustacean??
Are You “CooCoo” for Copepods?
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What’s Going On Here????
http://www.youtube.com/watch?v=yMxY4c5SeIs
http://news.nationalgeographic.com/news/2006/09/060921-krill-video.html
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http://library.thinkquest.org/J001418/what.html
Which Numbers Belong To Which Phyla?
(Try the rest for a good review before the unit test!)
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References (on our class website)
• http://www.dnr.state.md.us/baygame/bbc_molting.asp
• http://www.k12.de.us/warner/structure.html