Bulletin of Zoological Nomenclature 39 PLANOBBINA HALDEMAN, 1842, TAPHIUS ADAMS & ADAMS, 1855 AND ABMIGEBUS CLESSIN, 1884 (MOLLUSCA, GASTROPODA) : PROPOSED SUPPRESSION UNDER THE PLENARY POWERS. Z.N.(S.) 1392 C. A. Wright {British Museum {Natural History), London) The medically important molluscan intermediate hosts of the human parasite Schistosoma mansoni have for some time been placed in the nominal genera BiompJialaria, Australorhis and Tropicorbis. It is known that these three should be united into a single taxonomic genus and recently B. Hubendick (1955, Trans. Zool. Soc. Lond. 28(6) : 453-542) has shown that on anatomical grounds the genus should include the nominal genera Taphius and Platytaphius. By appUcation of the Law of Priority Taphius should take precedence as the senior synonym and W. L. Paraense (1958, Bev. Bras. Biol. 18(1) : 65-80) has presented the case in favour of follo^ang this course. However, it is likely that many medical parasitologists and public health workers wiU not be prepared to adopt the name Taphius and further investigation has sho^vn that there is an older available name for the group, namely Planorbina Haldeman, 1842. The fuU details of the case have been discussed by Barbosa, Hubendick, Malek and Wright {Ann. Mag. nat. Hist, in press). In that account the authors mention the problem of Armigerus which has also been used as the generic name for the group. 2. In a group of such great economic importance it is obviously essential that the nomenclature should be stabUized and it is the purpose of this applica-tion to ask for the suppression under the plenary powers of the names PlanorbinM Haldeman, 1842, Taphius Adams & Adams, 1855, and Armigerus Clessin, 1884. 3. Planorbina was named as a section of Planorbis by S. S. Haldeman (1842, A Monograph of the Freshwater Univalve Molluscs of the United States. E. G. Dorsey, Philadelphia, p. 14). No t3rpe-species was designated for this section nor were any species referred to it in that publication but W. H. Dall (1905, Land and Freshwater Molluscs, Harriman Alaska Expedition 13 : 1-158) designated Planorbis olivaceus Spix (1827, Testacea fluviatilia Brasiliensia p. 26) as type of Planorbina Haldeman and referred Planorbis glabrata Say (1818, J. Acad. nat. Sci. Philad. 1(2) : 280) to the section. Both of these species belong in the nominal genus Australorbis. H. A. PUsbry (1934, Proc. Acad. nat. Sci. Philad. 86(1) : 29-66) argued that Dall had misinterpreted Haldeman's definition of Planorbina and, because P. olivaceous could not possibly be included in that definition, Pilsbry stated that " Planorbina of Haldeman, 1843, has nothing to do with Planorbina Dall, 1905 ". H. Watson (1954, Rev. Zool. Bot. Afr. 49 (3 & 4) : 209-220) has also suggested that Planorbina Haldeman and Planorbina Dall are not synonymous but that the former referred to Anisus Studer, 1820 {Naturw. Anz. Allg. Schweiz. Oesell. 3, p. 23). However, DaU designated a tjrpe-species for Haldeman's Planorbina and, since that name Bull. zool. Nomencl, Vol. 19, Part 1. February, 1962.
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