Thecacera

Thecacera is a genus of sea slugs, specifically nudibranchs, shell-less marine gastropod mollusks in the family Polyceridae.

Species
Species in the genus Thecacera include:
 * Thecacera boyla Willan, 1989
 * Thecacera darwini Pruvot-Fol, 1950
 * Thecacera pacifica Bergh, 1883
 * Thecacera pennigera (Montagu, 1815)
 * Thecacera picta Baba, 1972
 * Thecacera virescens Alder & Hancock, 1851
 * Thecacera vittata Yonow, 1994