Crustaceans
An ostracod (Class Ostracoda)
Crustaceans found in New England
Crabs
- Family: Cancridae Cancer borealis (Jonah Crab)
- Family: Cancridae Cancer irroratus (Atlantic Rock Crab)
- Family: Hippidae Emerita talpoida (Atlantic Mole Crab, Atlantic Sand Crab)
- Family: Ocypodidae Uca (A Fiddler Crab)
- Family: Ocypodidae Uca pugilator (Atlantic Sand Fiddler Crab)
- Family: Paguridae Pagurus (A Hermit Crab)
- Family: Pisidae Libinia emarginata (Common Spider Crab, Portly Spider Crab)
- Family: Portunidae Callinectes sapidus (Blue Crab)
- Family: Portunidae Carcinus maenas (European Green Crab)
- Family: Portunidae Ovalipes ocellatus (Lady Crab)
Crayfish
- Family: Cambaridae (Crayfishes)
Amphipods
- Family: (Amphipods)
- Family: Talitridae Americorchestia megalophthalma (Northern Big-eyed Sandhopper)
Isopods
- Family: Armadillidiidae Armadillidium vulgare (Common Pillbug)
- Family: Asellidae Caecidotea (American Waterslaters)
- Family: Philosciidae Philoscia muscorum (A Woodlouse)
Barnacles
- Family: Archaeobalanidae Semibalanus balanoides (Northern Rock Barnacle)
- Family: Balanidae Balanus (An Acorn Barnacle)
Copepods
Fairy Shrimp
- Family: Chirocephalidae Eubranchipus vernalis (Springtime Fairy Shrimp)
Clam Shrimp
- Family: Lynceidae Lynceus brachyurus (Holarctic Clam Shrimp)