Powell et al. (2010) stated: "Callianax pycna Berry has a modern occurrence from Seaside Rock, Clatsop County, Oregon (Gifford and Gifford, 1948), south to Morro Rock, San Luis Obispo County, California, in water depths from the intertidal zone to 27 m (Burch, 1944-46). In the fossil record, C. pycna has been confused with C. biplicata (Sowerby), C. intorta (Carpenter), and C. pedroana (Conrad). Judging from published pictures and specimens examined in collections at CAS, LACM, and UCMP, C. pycna occurs in the Careaga Sandstone (Woodring and Bramlette, 1950), Carlotta(?), Elk River, Moonstone Beach, (Roth, 1979), and Purisima (Arnold, 1908; Martin, 1916; Allen, 1946; Touring, 1959; Cummings and others, 1962; Addicott and others, 1978; Perry, 1993) formations, and from Pleistocene terrace deposits at Año Nuevo State Reserve, central California (Addicott, 1966). These occurrences indicate a likely early Pliocene to Holocene age range for C. pycna.".
A poorly known, infrequently encountered, intertidal to shallow sub-tidal species distributed from Oregon to California, USA (Temperate Northern Pacific realm. Cold Temperate Northeast Pacific province). Also known from the Pliocene-Pleistocene of California.
Temperate Northern Pacific realm. Cold Temperate Northeast Pacific province. Oregon to California, USA (Olsson, 1956: 197). Washington State, USA (Holm, 2007).