Sea slug (Nudibranch) eating another sea slug

Sea slug is the common name of Nudibranchs coming under the phylum Mollusca. Video showing a sea slug of the genus Gymnodoris predating on another sea slug of genus Hypselodoris.

Gymnodoris is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Gymnodorididae
Hypselodoris is a genus of colorful sea slugs or dorid nudibranchs, marine gastropod mollusks in the family Chromodorididae.