Crustacea Lobster, crayfish, shrimp, crab, etc. Two to three body segments, compound eyes, mouth parts, five pairs of legs, two pairs antennae (antennae + antennules) Gills for respiration

Classification of Class Crustacea  (1) Subclass: Branchiopoda--fairy shrimp, brine shrimp  (2) Subclass: Copepoda--copepods  (3) Subclass: Cirripedia--barnaclesCirripedia  (4) Subclass: Malacostaca: oOrder: Stomatopoda--mantis shrimp oOrder: Euphausiacea--krill oOrder: Decapoda--shrimps, lobsters, crabsDecapoda oOrder: Isopoda– Roly-Poly (woodlice)

Branchiopoda- brine shrimp

Copepoda- copepod/cyclops

Cirripedia Barnacle

Stomatopoda--- mantis shrimp

Euphausiacea Krill---very important food source in the ocean

Isopoda---Roly Poly (terrestrial isopod)

Isopoda --- He could replace your tounge

Live Observations Pill Bugs –Watch how they move and use their antennae Ghost Shrimp –Feed them some bloodworms and watch how they use their mouthparts and how the food goes into the body (they are translucent).

Name and function of appendage

Physiology of Lobster/Crayfish Locomotion –Walking legs and abdominal tail flip (backwards) Food getting –Mechanical digestion - large claws and mouth parts (scavenger) - other crustaceans filter-feeders Digestion –Mechanical - mouth parts and gastric mill of stomach –Chemical – stomach with pyloric portions – receive enzymes from glands – extracellular digestion with absorption from digestive glands and intestine

When you think of a crustaceans mouth think Swiss army knife!

Name and function of appendage How cute is this!

Physiology of Lobster/Crayfish Excretion –Anus – opening of telson –Green gland (opening below eye) liquid salt balance Circulation –Open circulatory system – dorsal heart pumps colorless blood through vessels to gills and sinuses (large cavities where blood directly bathes body cells) Respiration –Gills contain capillaries for gaseous exchange & movement of swimmerets to assure fresh O 2 supply over gills

Physiology of Lobster/Crayfish Nervous System –Ventral ganglia and nerve cords –Antennae, eyes, mouth parts, hairs = sensory Reproduction –Sexes separate ( Dioecious) –Male opening 5th leg pair + modified first swimmeret –Female opening on 3 rd pair + reduced first swimmeret –Female stores sperm –Fertilized eggs attach to swimmerets – protect and fresh O 2 supply –Limb regeneration after autonomy