The operculate micro land snail genus Dicharax Kobelt & Möllendorff, 1900 (Caenogastropoda, Alycaeidae) in Thailand, with description of new species

This study reviews the Dicharax species in Thailand. Altogether ten are reported, four of which new to science and described herein. They borealis Jirapatrasilp & Páll-Gergely sp. nov. , burchi panhai pongrati Tongkerd Alycaeus davisi Godwin-Austen, 1914 is regarded as a junior subjective synonym cucullatus Theobald, 1870 (= D. ) based on similar depressed-conical shell shape, long sutural tube sharp swelling behind peristome. Furthermore, type locality pratatensis Panha Burch, 1997 had be amended. Most important characters distinguish general shape relative lengths teleoconch regions, whereas spiral striation R1, R3, outer peristome crenulation protrusion, exterior opercular sculpture show large intraspecific variability.