Tmethypocoelis celebensis sp. nov. Holotype, male (7.2 × 4.4 mm) (MZB.Cru.5574), Moletang River (estuary), Kema Tiga, North Minahasa, North Sulawesi. Left cheliped. Merus A lower margin B outer surface. Carpus C upper margin D lower margin E outer surface F inner surface. Chela G upper margin H lower margin. Merus I upper surface J lower surface K upper margin L outer margin. Chela M inner surface N outer surface O dactylus upper margin.