Phylum Arthropoda class Crustacea Largest phylum of animals

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Phylum Arthropoda class Crustacea

Phylum Arthropoda class Crustacea

Largest phylum of animals w/ approx One million known species

Largest phylum of animals w/ approx One million known species

Includes: insects, spiders, crabs Barnacles, shrimp, & lobsters

Includes: insects, spiders, crabs Barnacles, shrimp, & lobsters

General characteristics • Bilaterally symmetric • Have jointed appendages (legs & mouth parts) •

General characteristics • Bilaterally symmetric • Have jointed appendages (legs & mouth parts) • Exoskeleton made of chitin and hardened by Ca. CO 3 • Grow by molting

• Molting: • Old exoskeleton is shed leaving the animal soft • The

• Molting: • Old exoskeleton is shed leaving the animal soft • The animal brings in water to expand itself • A new exoskeleton is secreted by specialized tissue

• Exoskeleton provides protection, support, & flexibility • Also imposes limitations to grow

• Exoskeleton provides protection, support, & flexibility • Also imposes limitations to grow & size

Class: Crustacea • • • 30, 000 species primarily marine Gill-breathing 16 -20 segments

Class: Crustacea • • • 30, 000 species primarily marine Gill-breathing 16 -20 segments Open circulatory system Specialized appendages for food gathering, walking, fighting, defense, etc. Start out life as a planktonic larvae Ex: lobsters, crayfish, shrimp, crabs, copepods, barnacles, etc. Giant King Crab = largest crustacean (~12 ft) Heaviest is the lobsters (up to 48 lbs!!)

• Have two pairs of antennae (one pair smaller than the other) •

• Have two pairs of antennae (one pair smaller than the other) • Small, planktonic crustaceans include copepods, • barnacles, isopods, krill

Barnacles • Chitin exoskeleton & secretes Ca. CO 3 shell. • Feathery feet for

Barnacles • Chitin exoskeleton & secretes Ca. CO 3 shell. • Feathery feet for filter feeding plankton • Some attach to docks or boats and a few on whales • Must close up with an operculum during low tide to avoid desiccation (drying up).

Barnacles and Crabs • • • http: //www. youtube. com/watch? v=VKh. Yg. LGPCk&safety_mode=true&persist_safety_mode=1&safe=active Barnacle

Barnacles and Crabs • • • http: //www. youtube. com/watch? v=VKh. Yg. LGPCk&safety_mode=true&persist_safety_mode=1&safe=active Barnacle info http: //www. youtube. com/watch? v=49 Aev. HA 9 R 4&safety_mode=true&persist_safety_mode=1&safe=active Giant Crabs http: //www. youtube. com/watch? v=a. PJ 74 X_J_4&safety_mode=true&persist_safety_mode=1&safe=active Horseshoe Crabs http: //www. youtube. com/watch? v=e 8 Kl. Amt. Iu 1 E&safety_mode=true&persist _safety_mode=1&safe=active Molting horseshoe crab http: //www. youtube. com/watch? v=Daz 8 nkhp. WM&safety_mode=true&persist_safety_mode=1&safe=active

• Other larger crustaceans include shrimp, lobsters & crabs • Considered decapods (5

• Other larger crustaceans include shrimp, lobsters & crabs • Considered decapods (5 pairs of legs) • Body consists of cephalothorax (fused head & thorax) & abdomen

• Crabs have a compact abdomen & a broad cephalothorax • Abdomen usually

• Crabs have a compact abdomen & a broad cephalothorax • Abdomen usually tucked under

Male Female

Male Female

Abdomen with eggs

Abdomen with eggs

Lobsters • http: //www. youtube. com/watch? feature=endscreen&v=d 5 u. Q 317 Osxw& NR=1&safety_mode=true&persist_safety_mode=1&safe=active •

Lobsters • http: //www. youtube. com/watch? feature=endscreen&v=d 5 u. Q 317 Osxw& NR=1&safety_mode=true&persist_safety_mode=1&safe=active • Slipper lobster • http: //www. youtube. com/watch? v=8 g. Btsbo. Sk. OU&safety_mode=true&pe rsist_safety_mode=1&safe=active • Spiny Lobster • http: //www. youtube. com/watch? v=o 2 QDJw. OIa 7 s&safety_mode=true&p ersist_safety_mode=1&safe=active • Lobster Life Cycle: Safari Montage

Giant Spider Crab

Giant Spider Crab

King and Coconut Crabs

King and Coconut Crabs