Tagelus californianus, common name California tagelus, is a species of saltwater clams, marine bivalve mollusks belonging to the family Solecurtidae.

[1] This species can be found in the Eastern Pacific from the Gulf of California to Oregon.

[2][3] Shells of Tagelus californianus can reach a length of 130 millimetres (5.1 in) and a height of about 33 millimetres (1.3 in).

[4] These shells are yellowish-white, with rust-colored stains and a dark periostracum.

The posterior margin is slightly sinuous.