Horseshoe crab Video Horseshoe Crab Video

Phylum Arthropoda Class Crustacea Organisms that are Crustaceans: Barnacles Krill Shrimp, crabs and lobsters Horseshoe crabs

Anatomical Structures Segmented Body Bilaterally Symmetrical Jointed appendages Chitinous Exoskeleton made of CaCO3 2 Pair of Antennae

Barnacles -Small Crustaceans Attach to surface Plated- heavy CaCO3 Upper plate opens Filter feeder- Uses legs to filter water

Krill Planktonic Shrimp-like Filter Feeders School in the billions

Large Crustaceans- sub class Decopoda 5 pairs walking legs 1st heavier Pinchers Obtain Food and Defense Shell- Carapace 2 sections Cephalothorax - Head and Legs Abdomen – Swimmerettes and Tail

Shrimp and Lobster Elongated Abdomen Shrimp and lobsters are scavengers

Crayfish Related to the lobster Both marine and freshwater

Crabs Compact, Broad Cephalothorax Moves – Side to side Scavengers

How can you tell males from females? Male –Flat V shaped plate Female –Expanded U shaped plates To carry eggs

Horseshoe-shaped carapace 5 pairs of legs Horseshoe Crab Living Fossils Live in shallow water Horseshoe-shaped carapace 5 pairs of legs