Calathus ruficollis ruficollis

Distinguished from the nominate subspecies C. r. ignicollis by geographic distribution: C. r. ruficollis occurs south and west of the southern Sierra Nevada, while C. r. ignicollis is restricted to that mountain range. As a flightless beetle, individuals lack fully developed wings. Genetic analysis shows limited differentiation among populations of C. r. ruficollis despite its distribution across fragmented habitats.

Southern California coastal and inland regions including areas with potential geographic barriers such as the Los Angeles Basin, Transverse Ranges, and Peninsular Ranges. Found on mainland and Channel Islands (Santa Cruz, Santa Catalina, San Clemente).

Southern California from Santa Barbara County south to northern Baja California, Mexico. Includes Channel Islands: Santa Cruz Island, Santa Catalina Island, and San Clemente Island.

Flightless (wingless). Limited dispersal capability due to lack of flight, yet populations show evidence of recent range expansion and gene flow across geographic barriers.

• Calathus ruficollis ignicollisRestricted to the southern Sierra Nevada; separated from C. r. ruficollis by a deep genetic split corresponding to the Transverse Ranges barrier.
• Other Calathus speciesMay occur in overlapping ranges; identification requires examination of specific subspecies characteristics and geographic provenance.

• Carabidae
• Platyninae
• flightless
• phylogeography
• southern California
• Channel Islands
• endemic
• subspecies
• ground beetle
• Neocalathus

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Clouded beetles amidst spectacular scenery | Beetles In The Bush
• Oedemeridae | Beetles In The Bush
• A flower visiting jewel beetle that is not an Acmaeodera | Beetles In The Bush
• Agrilus fuscipennis on Persimmon | Beetles In The Bush
• Limited phylogeographic structure in the flightless ground beetle, Calathus ruficollis, in southern California