Costasiella vegae Ichikawa, 1993
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The brown, contiguous eyes are situated between the bases of the rhinophores. The anterior corners of the foot are not extended. The rhinophores are white with black tips. The white head bears a conspicuous red mark behind the eyes like a posteriorly pointing arrowhead. The cerata are arranged in 8 rows and all are of the same colouration, green spotted with white dots. The distal portion of each ceras has many small red spots, whose density increases distally, eventually coalescing into a red line. The pointed tips of the cerata are white. On the dorso-distal part of each ceras is an eye-shaped pattern, a white spot encircled by a dark green circle.