Classes of Arthropods

Meristomata HORSESHOE CRAB

CHARACTERISTICS 1. 2 body parts – cephalothorax and abdomen. 2. Long pointed tail

3. 5 pairs of walking legs with pincers.

Arachnida SPIDERS TICKS SCORPIONS

CHARACTERISTICS 2 body parts – Cephalothorax and abdomen

3. Fangs with poison glands 2. 4 pairs of walking legs. 3. Fangs with poison glands (chelicerae), and pedipalps

4. Spinnerets and web making ability.

Diplopoda Characteristics 1. Repeating segments in body. 2. 2 pairs of legs per segment. MILLIPEDES

Chilopoda Characteristics Repeated segments. 1 pair antennae 1 pair of legs per segment. CENTIPEDES

Crustacea SOW BUGS CRABS SHRIMP LOBSTER BARNACLES

Characteristics 1. 2 body parts – cephalothorax and abdomen

2. Many paired appendages A. At least 5 pairs of walking legs. B. Chelipeds – Food getting and defense.

C. Swimmerets for protecting eggs. D. Uropod for fast getaway.

E. 2 pairs of antennae F. Many mouth parts.

Insecta

Characteristics 1. 3 body parts – head thorax abdomen

2. 3 pairs of walking legs. 3. 1 or 2 pairs of wings. 4. 1 pair of antennae. 5. Most undergo metamorphosis