North Channel Islands shieldback
Aglaothorax islandica
The black dots 
on the distribution map represent county records. The dots are placed off the coast of California because the populations live on the Channel Islands Anacapa (Ventura County) and Santa Cruz and Santa Rosa (Santa Barbara County).
The above map shows the localities for the Morsei Group species from Cole et al. (2025). The blue dots (encircled in a black line*) show localities for A. islandica.
State: California
Santa Barbara County:
Santa Cruz Island Reserve Field Station.
Santa Rosa Island, 0.5 miles north of Black Mountain.
Santa Rosa Island, Black Mountain.
Santa Cruz Island, Canyon de Islay.
Santa Cruz Island Reserve Field Station.
Ventura County:
West Anacapa Island.
West Anacapa Island, Frenchy’s Cove.
Middle Anacapa Island.
*Line encircling the locality dots was added to the map by the SINA editor (tmy) to help the viewer pick out the dots; this is not an indication of range or distribution.
Summary of Species' SINA Distribution*
Aglaothorax islandica is found on three of the four northern California Channel Islands: Anacapa, Santa Cruz, and Santa Rosa.
*North America, north of Mexico.
List of United States Regions, States, and Counties
Map of
United States
Regions
Map of United States Regions
West Region
State: California
Counties: Santa Barbara, Ventura.
Notes
References:
The distribution map on this page is referred to as the 2024 distribution map.
All records are from Cole et al. (2025). [tmy 11 January 2026]