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During an ongoing study of the rotifer diversity in Thai peat swamps, several new or rare species were found. We here report on one new species, Lecane kunthuleensis n.sp., from a canal in Kun Thu Lee peat swamp, and on three rare species: Paracolurella aemula (Myers, 1934) and Lecane junki Koste, 1975 from Kra Jood peat swamp (Suratthanee province), and Lepadella punctata Wulfert, 1939 from To-Daeng peat swamp (Narathiwas province).