phylum arthropoda “jointed feet”. basic info largest of all phyla include: –insects...
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Phylum Arthropoda
“jointed feet”
Basic Info• Largest of all Phyla
• Include:– Insects– Arachnids– Crustaceans
Characteristics
• Segmented Body with Appendages on each segment
• Dorsal heart and ventral nervous system
• Covered by a hard exoskeleton– Less prone to
dehydration– Made of chitin– Molts periodically
due to growthMolting of a black crab
Common CrustaceansTrue Crabs• Five visible pairs of legs• Abdomen folded under
cephalothorax
7-11 crab, found wedged in rocks
A’ama, black crab
Box crabs
Female Male
Hermit Crabs• Salvage empty
shells for homes• Protect soft
abdomens
Some hermit crabs work cooperatively with other organisms (sea anemones attached above)
Common Hawaii tidepool hermit crab
Lobsters• Abdomen with
swimmerets
Spiny lobster
Slipper lobsterHawaiian lobster
Barnacles• “curl footed”, to capture
food• Larvae cements its head
down• Grow armor plates to
protect body
Symbiosis with Arthropods
Working together, pom pom crab and sea anemones, teddy bear crab with anemones, cleaner shrimp with eel
Best of friends, goby and the blind shrimp. Shrimp digs the hole, and the goby becomes the shrimps “eyes” for defense and gets leftover food.
Sponge crab uses sponge for self defense and sponge gets to move to new food.