Costasiella
Introduction '''''Costasiella'''''  is a genus of sacoglossan sea slugs, a shell-less marine opisthobranchid gastropod mollusk in the family Costasiellidae.The most recent diagnosis of the genus ''Costasiella'' is by the Dutch malacologist Cornelis Kees Swennen (2007).
Species There are 17 species in the genus ''Costasiella''* ''Costasiella arenaria'' K. R. Jensen, Krug, Dupont & Nishina, 2014* ''Costasiella coronata'' Swennen, 2007* ''Costasiella formicaria'' (Baba, 1959)* ''Costasiella fridae'' Fernández-Simón & Moles, 2023* ''Costasiella illa'' (Marcus, 1965)* ''Costasiella iridophora'' Ichikawa, 1993* ''Costasiella kuroshimae'' Ichikawa, 1993* ''Costasiella mandorahae'' Jensen 1997* ''Costasiella nonatoi'' Marcus & Marcus, 1960* ''Costasiella ocellifera'' (Simroth, 1895)* ''Costasiella pallida'' Jensen, 1985* ''Costasiella patricki'' Espinoza, DuPont & Valdés, 2014* ''Costasiella paweli'' Ichikawa, 1993* ''Costasiella rubrolineata'' Ichikawa, 1993* ''Costasiella usagi'' Ichikawa, 1993* ''Costasiella vegae'' Ichikawa, 1993* ''Costasiella virescens'' Pruvot-Fol, 1951;Species brought into synonymy:* ''Costasiella lilianae'' (Marcus & Marcus, 1969) - Clark (1984): synonym of ''Costasiella ocellifera'' (Simroth, 1895)
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