Trochoita frankohleri Thach & Huber, 2020

Bolotov, Ivan N., Konopleva, Ekaterina S., Vikhrev, Ilya V., Gofarov, Mikhail Y., Lopes-Lima, Manuel, Bogan, Arthur E., Lunn, Zau, Chan, Nyein, Win, Than, Aksenova, Olga V., Tomilova, Alena A., Tanmuangpak, Kitti, Tumpeesuwan, Sakboworn & Kondakov, Alexander V., 2021, Nominal taxa of freshwater Mollusca from Southeast Asia described by Dr. Nguyen N. Thach: A brief overview with new synonyms and fixation of a publication date, Ecologica Montenegrina 41 (1), pp. 73-83 : 81-82

Trochoita frankohleri Thach & Huber in Thach, 2020 [taxon inquirendum]

= Trochoita frankohleri Thach (2020a) : 22; pl. 4, figs 45–48.

Holotype: NCSM 113632 (North Carolina Museum of Natural Sciences , Raleigh, North Carolina, United States of America).

Type locality: Huahin District , Prachuap Khiri Khan Province, 200 km south of Bangkok, Thailand [approx. 12.57°N, 99.96°E, Pran Buri River basin] .

Comments: This nominal taxon seems to be a conchological variety of Trochotaia trochoides (Martens, 1860) . The latter species shares a vague type locality ( Siam = Thailand) and could hardly be distinguished from Thach’s taxon by conchological features (Brandt 1974; Li- Na et al. 2011). Small rivers draining into the Gulf of Thailand were connected with Mekong and Chao Phraya basins via continuous paleo-river systems during the Pleistocene (Bolotov et al. 2017a; Pfeiffer et al. 2021). However, the morphological delineation of taxa in this genus is next to impossible, and hence we would treat Trochoita frankohleri as taxon inquirendum until its status is confirmed based on a more convincing set of morphological and molecular evidences.