Based in reliable bibliographical technical reports of recent production, a new total of thirteen marine mollusc forms (eleventh gastropods - sea slugs, and two bivalves) are added and incorporated to the previous systematic malacological inventory of Santa Catarina's State-SC, Central Southern Brazil Region, the species Pleurobranchus testudinarius Cantraine, 1835, Cuthona cf. iris Edmunds & Just, 1983, Flabellina cf. marcusorum Gosliner & Kuzirian, 1990, Dondice occidentalis Engel, 1925, Phidiana lynceus Bergh, 1867, Tyrinna (= Okenia) evelinae (Marcus, 1958), Felimida (= Hypselodoris) marci (Marcus,1971), Tambja sp, Roboastra sp, Glaucus atlanticus Foster, 1777, Bursatella leachi Blainville, 1817, Eurytellina angrensis Marques & Simone, 2014, and Crassostrea mangle Amaral & Simone, 2014, included in thirteen genera and eleventh families, raise the state record for 667 species and subspecies regionally known (11 Polyplacophora, 408 Gastropoda, 10 Scaphopoda, 228 Bivalvia, and 10 Cephalopoda).
