Opinion 2496 (Case 3786) – Helix diodon Rossmässler, 1835 and Helix dibothrion Bielz, 1860 (currently Perforatella dibothrion) (Gastropoda, Stylommatophora, Hygromiidae) deemed unavailable from their first mention in synonymy, by setting aside the provisions of Art. 11.6.1

Abstract. The International Commission on Zoological Nomenclature received an application to conserve the subjective junior synonym Helix dibothrion Bielz, 1860 (originally spelled H. dibotrion) by suppressing its senior subjective synonym Helix diodon Rossmässler, 1835, with the additional proposal that the prevailing spelling dibothrion (currently as Perforatella dibothrion) be deemed the correct original spelling of the specific name originally spelled dibotrion. This Case was not approved by the Commission, who acted under Art. 83 of the Code by setting aside the application of Art. 11.6.1 for the names Helix diodon Rossmässler, 1835 and Helix dibotrion Bielz, 1860, which thereby were not made available under Art. 11.6.1 but were made available as Helix bidens var. diodon Tryon, 1887 and Helix dibothrion Kimakowicz, 1884, in keeping with the traditionally applied precedence of dibothrion over diodon.