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4 terms

Arthropoda

STUDY
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trilobita
only fossils
Chelicerata:
pincers/fangs
• ARACHNIDA: spiders, scorpions, ticks
• PYCNOGONIDA: sea spiders
• MERISTOMATA: horseshoe crabs
Uniramia
jawlike mandibles, no claws, one pair antennae

DIPLOPODA: millipedes
CHILOPODA: centipedes
INSECTA: 3 body regions/3
prs. of legs, more sp. than
any other class!

DNA suggests
millipedes and
centipedes are more
closely related to
annelids than insects
Crustacea
CaCO3 + chitin; 40,000 sp.

BRANCHIOPODA: "gill feet"; fresh water; filter feeders; ex: Daphnia
COPEPODA: "oar feet"; marine; filter feeders, huge biomass in
ocean
CIRRIPEDIA: "hairy feet"; ex: barnacles
OSTRACODA
MALACOSTRACA: 3 parts to body 1.) head+thorax, 2.) flexible
abdomen, 3.) tail
STROMATOPODA: ex: mantis shrimp
EUPHASIACEA: krill
ISOPODA
AMPHIPODA
DECAPODA: 10,000 sp; 5 prs. of legs; first pair= chelipeds
(=claw); ex: lobsters, crabs, shrimp