Bulletin of Zoological Nomenclature 64(1) March 2007 7 Case 3368 Eatoniella Dall, 1876 and eatoniellidae Ponder, 1965 (MoUusca, Gastropoda): proposed conservation Dietrich Kadolsky 66 Heathhurst Road, Sanderstead, Surrey CR2 OB A, U.K. (e-mail: kadolsky@btsgeo.com) Abstract. The purpose of this application, under Article 23.9.3 of the Code, is to conserve the names Eatoniella Dall, 1876 and eatoniellidae Ponder, 1965, which are junior subjective synonyms of Pahidestrina d'Orbigny, 1840 and paludestrinidae Newton, 1891, respectively. To date, Paludestrina d'Orbigny, 1840 and paludestrini-dae Newton, 1891 have been regarded as junior objective synonyms of Hydrobia Hartmann, 1821 and hydrobiidae Troschel, 1857 based on the designation of Cyclostoma aciitiim Draparnaud, 1805 as type species of Pahidestrina by Bourguignat, 1887. However, the earlier and overlooked type species designation of Paludina nigra d'Orbigny, 1840 by Nevill (1885) as the type species of Paludestrina renders Paludestrina a subjective synonym of Eatoniella. The names Paludestrina and paludestrinidae have never been used in the sense of Eatoniella and eatoniellidae, but have been frequently used mistakenly in the sense of Hydrobia and hydrobiidae. To avoid confusion, the suppression of Paludestrina and paludestrinidae is pro-posed. Paludina nigra d'Orbigny, 1840 is a jimior homonym of Paludina nigra Quoy & Gaimard, 1835 and its junior subjective synonym Eatoniella latina Marincovich, 1973 is proposed as a replacement name. Keywords. Nomenclature; taxonomy; hydrobiidae; paludestrinidae; eatoniellidae; Hydrobia; Paludestrina; Eatoniella; Paludina nigra; Eatoniella kerguelensis; Eatoniella latina; Indian Ocean; Pacific; gastropods. 1. E.A. Smith (1875, p. 70), proposed the new gastropod genus Eatonia with three new species included, E. kerguelensis (pp. 70-71), E. caliginosa (p. 71) and E. subrufescens (p. 71), all from Kerguelen Islands in the Indian Ocean. Dall (1876, p. 42) replaced Eatonia E.A. Smith, 1875 with Eatoniella, because of the existence of the senior homonym Eatonia Hall, 1857 (pp. 90-92). Eatonia kerguelensis E.A. Smith, 1875 was designated as the type species of Eatoniella by Nevill (1885, p. 129). In a revision of Eatoniella and related genus-group taxa, Ponder (1965, pp. 50-51) proposed the family name eatoniellidae. 2. The nominal taxa Eatoniella and eatoniellidae have been treated in several taxonomic studies since 1965 (Castellanos & Fernandez, 1972a, 1972b; Marincovich, 1973; Ponder & Yoo, 1977; Ponder, 1983, 1988; Ponder & Worsfold, 1994) and have been used in other publications based on these papers. Numerous species have been attributed to Eatoniella, usually from marine intertidal and shallow subtidal habitats of the southern hemisphere. 101 species-group names have since 1965 (i.e. since the work of Ponder (1965) who redefined the genus) been treated in at least one paper as
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