Nembrotha sagamiana Baba, 1955 Tambja sagamiana is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae.

[3][2] This species occurs in the West Pacific Ocean around Japan, Taiwan and Korea.

[4] Tambja sagamiana is blue with yellow to orange pustule-like spots all over its body.

It has green gills and black rhinophores.

This animal can reach a total length of at least 110 mm.