A mating pair of S. lessoniana swimming in the vicinity of a spawning area of submerged tree branches placed on the seabed to attract spawing female squids. In this image, the much larger male on top is swimming very closely to the smaller female. This demonstrates the typical sexual dimorphism of this species with the male being larger. On the female, the white structure visible through the distal mantle cavity is the nidamental gland.
Maturity: Adults; Sex: Male, female; Lab or Wild: Wild; Field Location: W. pacific, e. japan