Cadlinella subornatissima is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2] This species was described from Japan.

It has been found in South Korea and the Marshall Islands.

[3] Cadlinella subornatissima is similar to the common species Cadlinella ornatissima but has taller tubercles which are entirely white, not tipped with pink.

[4][5]