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

zoosystematics and evolution

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