Upper Left and Bottom: NOAA Photos
Upper Right: NPS Photo

The California freshwater shrimp (Syncaris pacifica) is a small,10-legged crustacean that inhabits perennially flowing streams with slow moving water and flat gradients. Listed as federally endangered since 1988, the species is endemic to Marin, Sonoma and Napa Counties. It is only found in portions of 16 coastal streams within this range, including Lagunitas Creek in Marin County, which is home to the most viable population of the shrimp and is the only site on protected lands. Existing populations of the species are threatened by introduced fish, and deterioration or loss of habitat from water diversion, impoundments, livestock and dairy activities, agricultural activities and developments, flood control activities, gravel mining, timber harvesting, migration barriers and water pollution.