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