Identity of Euprymna berryi Sasaki, 1929 (Cephalopoda : Sepiolidae)

As the results of critical observations on fashion of arm sucker enlargement, morphology of tentacular suckers and bodily and spermatophoric proportions, it was concluded that the genus Euprymna in the Japanese waters contains two sympatric species, E. morsei (Verrill, 1888) and E. berryi Sasaki, 1929