Churchill C.K.C., Alejandrino A., Valdés Á. & Ó Foighil D. (2013). Parallel changes in genital morphology delineate cryptic diversification of planktonic nudibranchs. Proceedings of the Royal Society B: Biological Sciences. 280(1765): 20131224. https://doi.org/10.1098/rspb.2013.1224 2 species