The organisms of Phylum Arthropoda (arthro means jointed, poda, leg or foot) all have:
- an exoskeleton; they shed/molt as the body grows
- body segments; head, thorax, abdomen, OR cephalothroax, abdomen
- jointed appendages; legs and chelipeds or claws
- a ventral (on the belly side) nervous system
- an open circulatory system; heir blood is pumped upwards within short vessels, then allowed to just wash down over all the their innards instead of being enclosed in veins.
The Phylum Arthropoda includes:
Class Crustacea or Crustaceans
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Crustacean Anatomy from a student's notebook -lift the flap to see internal structure
Subphylum: | Crustacea |
Class: | Malacostraca |
Order: | Decapoda |
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Lobsters and Crayfish
The only differences between lobster and crayfish are that crayfish are smaller and live in fresh water as opposed to lobster who live only in salt water.
Isopods
Crabs
Hermit Crabs
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Student (18 years old, special needs) notebook
A hermit crab doesn't make the shell in which it lives. The shell is made by a snail that has died.
Subphylum: | Crustacea |
Class: | Malacostraca |
Order: | Decapoda |
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Shrimp and Triops/Sea Monkeys
Trilobite
Barnacles
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Student's (age 18) Barnacle Pop-Up Page in his notebook.
Subphylum: | Crustacea |
Class: | Maxillopoda |
Subclass: | Thecostraca |
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Class Arachnida
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student notebook
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Subphylum: | Chelicerata |
Class: | Arachnida |
Order: | Araneae |
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Class: | Arachnida |
Subclass: | Dromopoda |
Order: | Opiliones |
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Classes Chilopoda (centipedes) and Diplopoda (millipedes)
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student page from Nature Portfolio |
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from student notebook
Class: | Insecta |
Order: | Hymenoptera |
Suborder: | Apocrita |
Superfamily: | Vespoidea |
Family: | Formicidae |
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sources: