Roboastra tentaculata is a species of sea slug, a polycerid nudibranch, a marine gastropod mollusc in the family Polyceridae.

[3] Oral tentacles allow sea slugs to move and obtain information from the environment.

[5][6] The bulk of the sea slug body is green, along with bright yellow or orange stripes outlined with brown.

[3] The digestive system is composed of salivary glands, an esophagus and an oral tube.

[3] The first duct is hermaphroditic with an ampulla, vas deferens and a spiked penis.