Costasiella kuroshimae Ichikawa, 1993
The anterior part of the head is divided longitudinally by a brown colour patternthus giving the impression of two roundish pouches. The rhinophores are white, but their tips are black. No oral tentacles are present. A brown mark is present medially behind the eyes. The cerata are arranged in 7 rows, generally green with white tips. Iridescent dots are scattered over the green parts of the cerata.