Case 3849 – Emplectonematidae Bürger, 1904 and Emplectonema Stimpson, 1857 (Nemertea, Monostilifera): proposed conservation of current usage by reversal of precedence of the family name with respect to Eunemertidae Joubin, 1894 and designation of a new type species for the genus

The purpose of this application, under Articles 23.9.3, 41, 65.2, and 70.2 of theCode, is to conserve the current usage and year of priority of the name Emplectonematidae Bürger, 1904 for a family of ribbon worms by reversing its precedence with respect toa senior synonym, E unemertidae Joubin, 1894, and to conserve the current concept andusage of its type genus, Emplectonema Stimpson, 1857, by designating Emplectonemaviride Stimpson, 1857 as the type species. In preparation for these rulings, a common typespecies, Nemertes gracilis Johnston, 1837, is designated herein for the nominal generaNemertes Johnston, 1837 (a largely neglected junior homonym of Nemertes Cuvier, 1816)and Eunemertes Joubin, 1894, thereby rendering the latter an objective junior synonym ofthe former and of its valid substitute name. The type species of Nemertes Cuvier, 1816was excluded from N emertidae sensu McIntosh, 1874 and sensu Hubrecht, 1879, which,having been recognized as a valid grouping by later authors, required a new name. Ofthe two available candidates, Eunemertidae Joubin, 1894 has been almost unused sincethe 1900s, whereas Emplectonematidae Bürger, 1904 has been in universal use sinceits proposal. The latter name has an uncertain date of priority; 1874, 1894 or 1904,depending on whether and how Art. 40.2 applies to it. Emplectonema viride Stimpson,1857, or its senior synonym Emplectonema gracile (Johnston, 1837), has universally beenregarded as the type species of Emplectonema since the 1950s; however, two overlookedfixations in 1892 and 1893 of Borlasia camillea Quatrefages, 1846 as the type speciesof this genus now threaten the stability of nemertean genus- and family-level taxonomy.Fil: Kajihara, Hiroshi. Hokkaido University; JapónFil: Grygier, Mark J.. National Taiwan Ocean University; ChinaFil: Andrade, Sónia C. S.. Universidade de Sao Paulo; BrasilFil: Bartolomaeus, Thomas. Universitat Bonn; AlemaniaFil: Cherneva, Irina A.. Lomonosov Moscow State University; RusiaFil: Chernyshev, Alexei V.. Russian Academy Of Science; RusiaFil: von Döhren, Jörn. Universitat Bonn; AlemaniaFil: Ellison, Christina I.. University of Oregon; Estados UnidosFil: Gibson, Ray. Liverpool John Moores University (liverpool John M. University);Fil: Giribet, Gonzalo. Harvard University; Estados UnidosFil: Hiebert, Terra. University of Oregon; Estados UnidosFil: Hookabe, Natsumi. University of Tokyo; JapónFil: Junoy, Juan. Universidad de Alcalá. Facultad de Ciencias; EspañaFil: Kvist, Sebastian. Royal Ontario Museum; CanadáFil: Maslakova, Svetlana A.. University of Oregon; Estados UnidosFil: Mendes, Cecili B.. Universidade de Sao Paulo; BrasilFil: Norenburg, Jon L.. National Museum Of Natural History. Departamento de Zoología. Area de Invertebrados; Estados UnidosFil: Polyakova, Neonila E.. Russian Academy Of Science; RusiaFil: Sagorny, Christina. Universitat Bonn; AlemaniaFil: Schwartz, Megan L.. University of Washington; Estados UnidosFil: Strand, Malin. Swedish University of Agricultural Sciences; SueciaFil: Sun, Shichun. Ocean University Of Chin; ChinaFil: Turbeville, James M.. Virginia Commonwealth University; Estados UnidosFil: Zattara, Eduardo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin