42 
PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 64, Supplement 1 
Table 8. List of 32 phreatobites from 80 groundwater sites in California. Of these, 23 species (72%) are 
single-site endemics. 
Region 
County 
Species 
Common Name 
Sites 
Bay Area/Delta 
Contra Costa, Napa 
Stygobromus sp. nr. cowani 
2 
Marin 
Pacificabathynella sequoiae 
1 
Stygobromus hyporheicus 
Hypoheic Amphipod 
1 
Napa 
Stygobromus cowani 
Cowan's Amphipod 
1 
Sonoma 
Stygobromus cherylae 
Cheryl's Amphipod 
1 
Stygobromus n. sp. no. 1 
New Species of 
Amphipod 
1 
Coast Ranges 
Los Angeles 
Califobathynella teucherti 
1 
Hexabathynella muliebris 
1 
Stygobromus n. sp .(hubbsi group) 
New Species of 
Amphipod 
1 
San Benito 
Stygobromus n. sp. no. 2 
Cave Amphipod, new 
species 
2 
San Diego 
Bathynella fratema 
1 
Bathynella germanitas 
1 
Califobathynella noodti 
1 
Californibathynella californica 
1 
Hexabathynella hessleri 
1 
Hexabathynella otayana 
1 
Texanobathynella sachi 
1 
Santa Barbara 
Stygobromus rudolphi 
Rudolph's Amphipod 
1 
Santa Clara 
Stygobromus n. sp. cf. mackenziei 
New Species of 
Amphipod 
3 
Klamath Mountains 
Siskiyou 
Stygobromus mysticus 
Secret Amphipod 
1 
Lava Flows North 
Modoc 
Stygobromus n. sp. aff. sierrensis 
New Species of 
Amphipod 
1 
Northern California 
Alameda, El Dorado, Lake, 
Marin, Mendocino, Napa, 
Santa Clara, Santa Cruz 
Calasellus califomicus 
California Cave Isopod 
24 
Madera, Napa, Tuolumne 
Calasellus sp. 
Isopod 
13 
San Joaquin Valley 
Stanislaus 
Stygobromus n. sp. aff. mackenziei 
New Species of 
Amphipod 
1 
Sierra Nevada North 
Butte 
Stygobromus gallawayae 
Gallaway's Amphipod 
1 
Lake Tahoe: El Dorado, 
Placer 
Stygobromus tahoensis 
Lake Tahoe Amphipod 
5 
Nevada, Sierra 
Stygobromus sheldoni 
Sheldon's Amphipod 
4 
Lake Tahoe: Placer 
Dendrocoelopsis hymanae 
Lake Tahoe Flatworm 
1 
Stygobromus lacicolus 
Deep Lake Amphipod 
1 
Stygobromus sierrensis 
Sierran Amphipod 
2 
Sierra Nevada South 
Fresno 
Calasellus longus 
Isopod 
1 
Inyo 
Stygobromus myersae 
Myers' Amphipod 
2 
