New species of Ptychoptera are described, highlighting family records and updated identification keys in Southeast Asia.
Five new Oriental species of Ptychoptera Meigen, 1803 are herein described and illustrated: Ptychoptera hantu Kolcsár & Fasbender, sp. nov . from Singapore, representing the first record of the family from the country; P. phutphi Kolcsár & Fasbender, sp. nov . from western Thailand; P. pseudosimilis Fasbender, sp. nov . from Arunachal Pradesh, India; P. vietnamensis Paramonov, sp. nov . from northwestern Vietnam; and P. srilankaensis Paramonov, sp. nov . from central Sri Lanka. In addition, P. annandalei Brunetti, 1918, P. perbona Alexander, 1946, and P. persimilis Alexander, 1947 are redescribed, with P. annandalei newly recorded from Thailand and P. perbona from both Thailand and Vietnam. Ptychoptera cordata Zhang & Kang, 2021 is synonymized with P. annandalei and P. perbona flaviventris Alexander, 1946 with P. perbona . An updated key for identifying males of the P. formosensis species group is presented.
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Kolcsár et al. (2026) studied this question.
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