Santander M. & Valdés Á. (2013). Genetic structure of Polycera alabe and P. atra (Mollusca: Opisthobranchia: Nudibranchia) in the Pacific coast of North America. Bulletin of the Southern California Academy of Sciences. 112(3): 176-184. https://doi.org/10.3160/0038-3872-112.3.176 1 species