Armina californica is a species of sea slug, a nudibranch, a marine gastropod mollusk in the family Arminidae.

[1] This species occurs in the Eastern Pacific Ocean from Vancouver Island to Panama.

It can commonly be found in a soft-bottom habitat[2] from 1-230 meters in depth.

[3] Armina californica is characterized by longitudinal ridges of varying colors including light pink, cream, and brown.

[3] Features that differentiate Armina californica from the larger Armina species are separated rhinophores, rachidian teeth with 8-13 elongated denticles, and lateral teeth with 7-9 triangular denticles.