Volvatella ayakii Hamatani 1972

Hamatani 1972. A new species of Volvatella Pease, 1860, found in the 'caulerpan microfauna' in the province of Kii, middle Japan (Opisthobranchia: Sacoglossa). Publications Seto Mar Biol Lab, 21(1) 1972: 13-20