Crepidula cf. plana is similar to Crepidula plana but has direct development as opposed to a short planktonic stage. The 2 species are similar in appearance, but C. cf. plana is significantly smaller at only 5 - 8 mm in length. Shells are oval and flat in appearance, and white in color. Both C. plana and C. cf. plana can be found inside empty shells of whelks and moon snails. C. cf. plana is expected to be renamed.