Cratena
Introduction ''Cratena'' is a genus of sea slugs, aeolid nudibranchs, marine gastropod molluscs in the family Facelinidae. ''Cratena'' is the type genus of the subfamily Crateninae.
Species Species within the genus ''Cratena'' include:* ''Cratena affinis''  (Baba, 1949)* ''Cratena capensis'' Barnard, 1927 - orange-eyed nudibranch* ''Cratena lineata''  Eliot, 1905* ''Cratena minor'' Padula, Araújo, Matthews-Cascon & Schrödl, 2014* ''Cratena pawarshindeorum'' Bharate, Padula, Apte & Shimpi, 2020* ''Cratena peregrina'' (Gmelin, 1791)* ''Cratena pilata'' (Gould, 1870)* ''Cratena poshitraensis'' Bharate, Padula, Apte & Shimpi, 2020* ''Cratena scintilla'' Ortea & Moro, 1998* ''Cratena simba'' Edmunds, 1970* ''Cratena tema'' Edmunds, 2015 ;Taxa inquirenda:* ''Cratena cornuta'' (Risbec, 1928) * ''Cratena diffusa'' (Risbec, 1928) * ''Cratena grisea'' (Risbec, 1928);Species brought into synonymy:* ''Cratena anulata'' Baba, 1949: synonym of ''Cuthona anulata'' (Baba, 1949)* ''Cratena cavanca'' Bergh, 1898: synonym of ''Phidiana lottini'' (Lesson, 1831)* ''Cratena exigua'' Thiele, 1912: synonym of ''Cuthona georgiana'' (Pfeffer in Martens & Pfeffer, 1886)* ''Cratena fructuosa'' Bergh, 1892: synonym of ''Cuthona fructuosa'' (Bergh, 1892)* ''Cratena genovae'' O'Donoghue, 1929: synonym of ''Cuthona genovae'' (O'Donoghue, 1929)* ''Cratena gymnota'' (Couthouy, 1838): synonym of ''Cuthona gymnota'' (Couthouy, 1838)* ''Cratena hirsuta'' Bergh, 1864: synonym of ''Cuthona nana'' (Alder & Hancock, 1842)* ''Cratena kaoruae'' Marcus, 1957: synonym of ''Cratena pilata'' (Gould, 1870)* ''Cratena lugubris'' Bergh, 1870: synonym of ''Phestilla lugubris'' (Bergh, 1870)* ''Cratena macphersonae'' Burn, 1962: synonym of ''Phyllodesmium macphersonae'' (Burn, 1962)* ''Cratena nigricolora'' Baba, 1955: synonym of ''Catriona nigricolora'' (Baba, 1955)* ''Cratena pinnifera'' Baba, 1949: synonym of ''Catriona pinnifera'' (Baba, 1949)* ''Cratena piutaensis'' Ortea, Caballer & Espinosa, 2003: synonym of ''Anetarca piutaensis'' (Ortea, Caballer & Espinosa, 2003)* ''Cratena puellula'' Baba, 1955: synonym of ''Cuthona puellula'' (Baba, 1955)* ''Cratena pusilla'' Bergh, 1898: synonym of ''Cuthona pusilla'' (Bergh, 1898)* ''Cratena valentini'' Eliot, 1907: synonym of ''Cuthona valentini'' (Eliot, 1907)* ''Cratena venusta'' Baba, 1949: synonym of ''Catriona venusta'' (Baba, 1949)* ''Cratena veronicae'' A. E. Verrill, 1880: synonym of ''Cuthona veronicae'' (A. E. Verrill, 1880)* ''Cratena vittata'' (Alder & Hancock, 1842): synonym of ''Eubranchus vittatus'' (Alder & Hancock, 1842)* ''Cratena yatsui'' Baba, 1930: synonym of ''Herviella yatsui'' (Baba, 1930)
References *  Bergh R. 1864. ''Anatomiske bidrag til kundskab om Aeolidierne''. Det Kongelige Videnskabernes Selskabs Skrifter, Naturvidenskabelige og Mathematiske Afdeling, 7: 139–316*  ICZN. (1966). Opinion 776. ''Cratena Bergh, 1864 (Gastropoda): Added to the Official List of Generic Names''. Bulletin of Zoological Nomenclature. 23: 93-94*  Paper on nomenclature