Taxonomic re-evaluation of Chloritis bifoveata (Benson 1856) and C. diplochone Möllendorff 1898 (Pulmonata: Camaenidae)

Morphological comparison of the two congeneric allopatric camaenid land snails, Chloritis bifoveata (Benson 1856) and C. diplochone Möllendorff 1898, was evaluated. Both species show strong similarities in some unique characters such as the extraordinary biconcave shell shape. However, the species differ in shell size with C. bifoveata the smaller of the two, and also in length of the penis and vagina, again shorter in C. bifoveata. The penis and vagina are of almost equal length and size in C. bifoveata are almost equal but in C. diplochone the penis is longer and more slender than the vagina. The distributions of the species are also very different with C. bifoveata occurring in southern Myanmar, Thailand and northern Malaysia and C. diplochone in eastern Thailand to the Indochina region.