Currently there are 29 species of flatfishes representing three families (Paralichthyidae, Pleuronectidae, and Cynoglossidae) in California, with an additional species and family (Pacific lined sole, Achirus mazatlanus; family Achiridae) reported just below the United States-Mexico International Border (Hubbs et al. 1979; Lea et al. 1989; Lea, in prep.). This paper reports the first occurrence of the 30th species of flatfish in California and the first occurrence of the family Bothidae in the state. Seven California species (gulf sanddab, Citharichthys fragilis; Pacific sanddab, Citharichthys sordidus; speckled sanddab, Citharichthys stigmaeus; longfin sanddab, Citharichthys xanthostigma; bigmouth sole, Hippoglossina stomata; California halibut, Paralichthys californicus; and fantail sole, Xystreurys liolepis) placed in Bothidae in Robins et al. (1991) and earlier references have been placed in Paralichthyidae by most recent authoritative references (Nelson 1994, Hensley 1995b, Moser and Sumida 1996, Eschmeyer 1998).