coastal shieldback
Aglaothorax costalis
The black dots 
on the distribution map represent county records.
The above map shows the localities for the Morsei Group species from Cole et al. (2025). The green dots (encircled in a black line*) show localities for A. costalis.
State: California
Los Angeles County: SR23S and Mulholland Highway.
Point Mugu State Park Mugu State Park, Sycamore Canyon.
Point Mugu State Park.
Point Mugu State Park, visitor parking lot.
Junction of SR23S and Mulholland Highway.
Point Dume, area east of intersection Cliffside and Birdview drives.
Backbone Trail near Tapia Park, 5 miles north of SR1 on Malibu Canyon Road.
Charmlee Wilderness Park, 3.8 miles north of SR1 on Encinal Canyon Road.
Malibu, corner of Malibu Canyon Road and Pacific Coast Highway.
Solstice Canyon, Santa Monica Mountains.
Ventura County: Point Mugu State Park.
*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 costalis is found in the Santa Monica Mountains of southern California west of Malibu Creek.
*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: Los Angeles, 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]