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Checklist of Freshwater and Terrestrial Crustacea
Checklist of Freshwater and Terrestrial Crustacea
| Freshwater and Terrestrial Crustaceans | | |
| Scientific Name | Common Name | Notes |
| Class Malacostraca, Order Amphipoda | | |
| Family Crangonyctidae | | |
| Crangonyx pseudogracilis | | Tiasquam River |
| Crangonyx richmondensis | | common; found in several kettle-hole ponds |
| Family Gammaridae | | |
| Gammarus fasciatus | | common and widespread in most water bodies |
| Gammarus tigrinus | | common in brackish/fresh water in some coastal ponds |
| Family Talitridae | | |
| Hyalella azteca | | common in large streams |
| Class Malacostrata, Order Isopoda | | |
| Family Armadillidiidae | | |
| Armadillidium vulgare | Common Pill Bug | common in moist wooded areas in or under rotted logs, leaves, etc. |
| Family Asellidae | | |
| Caecidotea communis | | common and widespread |
| Class Branchiopoda, Order Cladocera | | |
| Family Chirocephalidae | | |
| Eubranchipus vernalis | Springtime Fairy Shrimp | found in a few vernal pools. |
| Family Limnadiidae | | |
| Limnadia lenticularis | Common Clam Shrimp | first discovered on the island in spring 1998; found in vernal pools; species of Special Concern in MA |
| Class Maxillipoda, Subclass Copepoda | | |
| Family Cyclopidae | | |
| Eucyclops agilis | | found in Edgartown Great Pond |
| Eucyclops prasinus | | found in Edgartown Great Pond |
| Mesocyclops obsoletus | | found in Edgartown Great Pond |
| Family Diaptomidae | | |
| Diaptomus leptopus | | found in a small pond in Edgartown |
| Family Ergasilidae | | |
| Ergasilus centrarchidarum | | parasitic, found on Rainbow Smelt |