Paleontology

Geologic time

:

Middle Cambrian - Present

Geography

Distribution	:	Cosmopolitan
Geographic region	:	Africa
Geographic region	:	Antarctic Region
Geographic region	:	Arctic Region
Geographic region	:	Asia
Geographic region	:	Atlantic Ocean
Geographic region	:	Australian Region
Geographic region	:	Europe
Geographic region	:	Indian Ocean
Geographic region	:	North America
Geographic region	:	Pacific Ocean
Geographic region	:	South America

Ecology/Habitat

Habitat	:	Brackish
Habitat	:	Freshwater
Habitat	:	Marine
Habitat	:	Terrestrial