Phylum Arthopoda
- Jointed legs
- Largest phylum (75% of all animals)
- Terrestrial, fresh, and salt water.
- Exo-skeleton: Outside; and made of chi-tin
- Protection, attachment of muscles support
- Molt: Sheds exo-skeletons, grows (ecdysis)
- Chitin: A polysaccharide (sugar) that is the principal components of the exoskeletons of arthopods and the bodies of fungi.
- Segmented body: bilateral symmetry
- Jointed appendages
- Dioecous: separate males + females
- Eyes: two types
- Compound - image forming
- Simple: detect movement
- Insects: 780,000 + species
- Rare in the southwest: slat marshes (flies, mosquitoes)
- Class crustaceans: crab, shrimp, and lobster
- Mostly salt-water
- Two pairs of segmented antennae, 4-6 mouth parts.
- Have gills for oxygen
- Appendages specialized for crawling, swimming, mating, and feeding.
- Many have a carapace (hard covering over thorax)
- Order cladocera: "water fleas"
- zooplankton
- C - shaped with appendages , 1 large compound eye, 2 pairs of antennae
Order Copepods:
- Swim with antennae
- Pear-shaped body
- Some parasidic
- Large number found in the Arctic
- Most common zooplankton in the ocean
Order Cirripedia:
- Sessilein adultage, some parasitic
- Plankton feeder
- Lieon back with plates covering body
Order Decapoda:
- Stalked eyes on head
- Have 10 legs
- Commonly have carapace
- Body typically have 19 segments
- Many have cephalothorax
- Zooplankton in larval stage
Order Amphipoda (bench hepper):
- Bilaterally compressed - 13 segments no carapace
- Feed on detritus (waste)
- Found in masses of Kelp
- Primary diet of gray whale
- zooplakton
Order Isopoda:
- Flat turned or depressed body
- All appendages are equal length
- Some are parasitic