11 Chelicerata Class Merostomata Class Arachnida Horseshoe crabsWater scorpions (eurypterids)Class ArachnidaSpidersMitesTicksScorpionsClass Pycnogonida (sea spiders)
12 Chelicerate Characteristics Two-part bodyOpisthosomaChelicerae (1st pair of appendages – forms feeding palps or fangs)Pedipalps (2nd pair of appendages)Cephalothorax (prosoma)Book lungs or book gills
13 Crustacea Class Malacostraca Class Branchiopoda Shrimp, lobsters, crayfishIsopods (wood lice – roly poly)AmphipodsClass BranchiopodaFairy shrimp, brine shrimpWater fleas
14 Class Copepoda Class Cirripedia Cyclops (freshwater) Barnacles Sacculina – parasite of crabs
15 Crustacean Characteristics 2 pairs of antennaeBiramous appendages (Y-shaped)Segments are serially homologous
16 Uniramia Class Diplopoda (millipedes) Class Chilopoda (centipedes) Class PauropodaClass SymphylaClass Hexapoda (insects)
17 Insect Locomotion Flight Walking (3+ legs on ground at all times) Running (Can run on 2 legs)Swimming (legs modified as paddles)Jumping (saltatory locomotion)
19 Nervous System Johnston’s organs (hearing - on antennae) Tympanic organs (hearing – on legs or body)Compound eyes (facets – ommatidia – fused)Simple eyes (ocelli)
20 Metamorphosis Type Appearance Young called Ametabolous larvae look like adults, just smallerinstarsPaurometabolousSpecific number of moltsNymphs (land)Naiads (water)HolometabolousYoung very different from adultsLarvae
21 Economic Impact of Arthropods Name one effect each major group has on mankind (good or bad).For insects, list 4 good things that they do and 4 bad things that they are responsible for.
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