Nomenclatural revision concerning some genera of the Order Trigoniida (Bivalvia)

Abstract

The authors have become aware of a couple of nomenclatural conflicts involving Mesozoic trigoniid genera, which are in need of clarification and proposal of replacement names: The case of Protrigonia. The subgenus Trigonia (Protrigonia) Guo, 1985 (p. 204, 269; type species Trigonia (Protrigonia) yunnanensis Guo, 1985), was proposed to encompass those species referred to the genus Trigonia which, according to that author, have small and nearly smooth shells and relatively weak teeth. Guo (1985) also included other Triassic species: Trigonia gaytani (von Klipstein, 1843) and Trigonia zlambachiensis Haas, 1909. According to Fang et al. (2009, p. 55) there was a wrong translation from the Chinese text to the English summary, and the subgenus was thus characterized as “prosogyrous” when actually the original Chinese version meant opisthogyrate. However, the name Protrigonia happens to be preoccupied by Protrigonia Hampson, 1896, a monotypic genus of Lepidoptera (Insecta), which denotes an extant moth from India.