The maximum size of adult Japanese bobtail squid, also known as Sepiolina nipponensis, the only species in its genus, is 2.5 cm in mantle length (ML), and its body consists of large fins and a short and dome-shaped mantle surrounded by an iridescent belt.
Sepiolina nipponensis, also known as the Japanese bobtail squid, is a bobtail squid and the only species in the genus Sepiolina. The maximum size of adult Japanese bobtail squid is 2.5 cm in mantle length (ML). The body consists of large fins and a short and dome-shaped mantle surrounded by an iridescent belt. 
