Phylum Arthropoda

Focus on Crustaceans Phylum Arthropoda “Arthropoda” means jointed compound eye - detects feet movement examples include: lobsters, Focus on Crustaceans - crabs, spiders, bees, etc “insects of the sea”

Body is segmented with jointed 2 pairs of antennae appendages and mouth parts Carapace - fused body Exoskeleton made of Chitin Have gills

Body divided into cephalothorax Appendages specialized for and abdomen swimming, crawling, feeding and attachment Class Crustacea All crustaceans have 5 Crustaceans are broken pairs of appendages into 3 subclasses emerging from the head Malacostraca = crabs, First 2 are antennae - for shrimps, lobsters, sensing isopods, amphipods

Third are mandibles - to Copepoda=copepods grind and mash food Cirripedia = Fourth and Fifth are barnacles Maxillae to handle food and generate water currents for gas exchange Subclass Malacostraca Small crustaceans:

found everywhere!! In plankton, on bottom, between sediment, crawling on animals, seaweed, etc

Krill = shrimp like, food for many other organisms - especially whales and sharks

Amphipods = compressed side to side, tail curves down

Isopods= flat from top to bottom Subclass Malacostraca Decapods = crabs, shrimps, lobsters

larger crustaceans

have Chelipeds - claws (pinchers)

Oregon examples:

Red Rock Crabs

Purple Shore Crab

Kelp Crabs

Porcelain Crab

Dungeness Crab Subclass Copepoda Important member of the plankton world often bioluminescent one “eye” two long antennae Subclass Cirripedia Barnacles: Acorn and Gooseneck in Oregon

filter feeding crustaceans

enclosed in calcareous plates

live attached to bottom or living creature- like grey whales

live on their head, use their feet to create a current to feed Other cool examples Horseshoe Crab

ancient species unique to the Atlantic Coast.

8 legs - related to spiders - NOT crabs!!

Hermit Crab - not a true crab

soft thorax

live in abandoned Gastropod shells

Mantis Shrimp

most complex eye in arthropods

powerful “punch” - can break glass!!!!