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Subphylum
Class
Order
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Trilobita
Extinct for 200 million years
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Chelicerata
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Crustacea
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Merostomata
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Arachnida
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Pyconogonida
(Greek-thick
knees or all legs)
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Malacostraca
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Maxillopoda
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Branchiopoda
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Decapoda
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Euphausiacea
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Amphipoda
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Isopoda
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Copepoda (subclass)
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Cirripedia
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Anostraca
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Cladocera
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Common Names
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Trilobites
No living spp.
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Horseshoe crab (Limulus)
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Spiders, scorpions, mites, ticks
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Sea spiders
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Crab, crayfish, shrimp, lobster
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Krill
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Parasitic, pill bugs
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Calanus, Cyclops, Diaptomus
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Barnacles
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Fairy & Brine shrimp
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Water fleas - Daphnia
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Appendages
Chelicerae
Pedipalps
Mandibles
Antennae
Walking legs
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# of pairs
1-antennae
4-leglike appendages
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# of pairs
1-chelicera
1-pedipalps
4-legs
0-antennae
0-mandible
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# of pairs
1-chelicera
1-pedipalps
4-legs
0-antennae
0-mandible
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# of pairs
1-chelicera
1-pedipalps
1-oviger-male
5-6- legs
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# of pairs
2-antennae
1-mandible
2-maxillae
3-maxilliped
1-cheliped (also walking leg)
5-walking legs
(1 is cheliped)
3-5-swimmerets (first
in male=copulatory)
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0-maxillipeds
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# of pairs
1-2- antennae
1-maxillipeds (uniramous)
4-thoracic swimming appendages
(biramous)
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Flattened & leaf-like legs:
chief respiratory organs
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Tagmata
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Head
(cephalon)
Trunk
Pygidium
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Cephalothorax (carapace-shell)
Opisthosoma (abdomen)
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Prosoma (cephalothorax)
Opisthosoma (abdomen)
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Cephalon (small head)
Thorax
Abdomen (reduced)
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Decapod(fused)
Head -5 (fused) somites
Thorax-8 (fused) somites
Abdomen-6 somites
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Body-dorso-ventrally flattened
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Head-reduced
No Abdomen
Thoracic legs are long with
hair-like setae
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Cuticle
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Carapace
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Carapace
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Sensory hairs
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Carapace
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No-Car
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No-Car
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No-Car
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Lack carapace
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Calcareous plates
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Sense Organs
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Compound eyes
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Compound eye & simple eye
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8 simple eyes
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4 simple eyes
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Compound eyes
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Simple, median eye
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Unique structures
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Telson, Carapace, hinge, gills,
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Book lung, spinnerets
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Proboscis
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Crayfish - rostrum, posterior
telson, carapace, uropod, antennal gland (green
gland)
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Free-living consumer- marine
plankton &freshwater plankton
Parasitic forms- unrecognizable
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Parasitic= kentrogon stage
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Reproduction
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Dioecious
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Dioecious
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Dioecious
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Hermaphroditic – big penis
Monoecious
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Partheno-genesis – w/out males
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Larvae
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Zoeaà megalopaà crab
Crayfish=direct development
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Nauplius
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Nauplii
Cyprid-bivalve carapace
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Gradual metamor-phosis
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Direct develop-ment
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Habitat
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Marine
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Marine
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Terrestrial
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Marine
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Aquatic
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Both
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Subphylum
Class
Order
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Uniramia
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Chilopoda
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Diplopoda
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Hexapoda
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Insecta
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Common Names
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Appendages
Chelicerae
Pedipalps
Mandibles
Antennae
Walking legs
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Tagmata
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Cuticle
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Sense Organs
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Unique Structures
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Reproduction
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Larvae
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Habitat
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