Prionotus birostratu s Richardson, 1844 .

Twobeak Searobin. To 18 cm (7.1 in) TL (Bussing in Fischer et al. 1995). Bahía Magdalena, southern Baja California (De La Cruz-Agüero et al. 1994) to Playas, Ecuador (Bussing in Fischer et al. 1995), including Gulf of California (Bussing in Fischer et al. 1995). Depth: 18–61 m (60–200 ft) (min.: Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California; max.: Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California).