50 Bulletin of Zoological Nomenclature PROPOSED SUPPRESSION UNDER THE PLENARY POWERS OF THE GENERIC NAME CRATENA BERGH, 1864, IN ORDER TO VALIDATE THE GENERIC NAME RIZZOLIA TRINCHESE, 1877 (CLASS GASTROPODA). Z.N.(S.) 1105 By Henning Lemche (Universitetets Zoologiske Museum, Copenhagen, Denmark) Bergh, 1864 {K. Danske Vid. Selsk. Skr. Math.-nat. Afd. (5) 7 : 213) des-cribed a new genus Cratena. In a rather lengthy discussion in Danish, he pointed out the confusion already existing in the use of the name Montagua. To clarify some of the problems involved he introduced Cratena, giving as the type-species " Ae. peregrina " which is Doris peregrina Gmelin, 1791 {Syst. Nat. (ed. 13) 1 : 3105). 2. Later authors, amongst them Iredale and O'Donoghue (1923, Proc. Malac. Soc. Lond. 15 : 104) interpreted Bergh's explanations to mean that the name Cratena was to be regarded as a substitute name for Montagua Fleming, 1822^, with the result that they regarded Doris caerulea Montagu, 1804 as the type. Winckworth (1941, Proc. Malac. Soc. Lond. 24 : 146) gave a translation into Enghsh of the main parts of Bergh's discussion and concluded correctly that the type-species of Cratena is Doris peregrina Gmelin. 3. In 1877, Trinchese (Rend. Ace. Sci. Inst. Bologna, 1876-77 : 147) pub-hshed the name Rizzolia, the type-species of which, by monotypy, is also Doris peregrina GmeUn, 1791. Thus Cratena and Rizzolia are objective synonyms^. The misunderstandings as to the real nature of the genus Cratena, however, were furthered by Bergh himself, who in his later papers had entirely forgotten what was his original intention in erecting the genus. Thus in Malac. Unters. 3 in Semper, Reisen Arch. Philip. 3 (18) : 1031, he placed the species Rizzolia pere-grina under the " subfamily V, Favorinidae " far distant from his " subfamily II, Cratenidae" (: 1021). 4. There has never been any confusion between the genera Rizzolia Trinchese, and Cratena Auctt. non Bergh, so that the enormous confusion in which this latter name has been involved did not spread to Rizzolia — until, in 1954, Macnae {Ann. Natal Mus. 13 : 28) accepted the name Cratena in its original sense, placing Rizzolia as a synonym. However correct this procedure may be, it is certain to cause even more confusion than ever. More than half of the large group Aeolidacea has become involved in such entangled nomen-clatorial problems and changes that a break-down of the whole taxonomy is threatened.lt is of the utmost importance that this confusion be stopped as soon as ever possible. Therefore, as regards the name Cratena, one of the centres of this confusion, there is no other possibility than to have it suppressed altogether. 5. At the same time the family-group name crateninae Bergh, in Carus, 1889 {Prodr. Fauna Med. 2 : 209) should be placed on the Official Index. This name is based upon a misidentified type-genus and was used in the same sense > See application Z.N.(S.) 1104, Bull. zool. Nomencl. 21 : 48-49 * See application Z.N.(S.) 1103, Bull. zool. Nomencl. 21: 45-47 Bull. zool. Nomencl., Vol. 21, Part 1. March 1964.
Proposed suppression under the Plenary Powers of the generic name Cratena Bergh, 1864, in order to validate the generic name Rizzolia Trinchese, 1877 (Class Gastropoda)
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