biostudies-literatureUnknown1120Han WNational Natural Science Foundation of China<i>Eupolyphaga</i> Chopard, 1929 is a cockroach genus mainly endemic to China. In this study, the species diversity of this genus is further explored through morphology and molecular analysis. Four species are described new to science: <i>Eupolyphagamiracidia</i> Qiu, <b>sp. nov.</b>, <i>Eupolyphagaudenostyla</i> Qiu, <b>sp. nov.</b>, <i>Eupolyphagareducta</i> Qiu, <b>sp. nov.</b>, and <i>Eupolyphagasimila</i> Qiu, <b>sp. nov.</b> New knowledge on some known species is added, including new distribution records and characteristics of females. Forty-five COI sequences were newly sequenced and a molecular species delimitation analysis was performed using ABGD method. Eighteen molecular operational taxonomic units were obtained by ABGD analysis, which are nearly consistent with the results of ZooKeys67-94https://www.ebi.ac.uk/biostudies/studies/S-EPMC9848677biostudies-literatureExploring the diversity of <i>Eupolyphaga</i> Chopard, 1929 (Blattodea, Corydioidea): species delimitation based on morphology and molecular analysis.PMC9848677Zhu JWang ZQHan WQiu LChe YLfalseExploring the diversity of <i>Eupolyphaga</i> Chopard, 1929 (Blattodea, Corydioidea): species delimitation based on morphology and molecular analysis.<i>Eupolyphaga</i> Chopard, 1929 is a cockroach genus mainly endemic to China. In this study, the species diversity of this genus is further explored through morphology and molecular analysis. Four species are described new to science: <i>Eupolyphagamiracidia</i> Qiu, <b>sp. nov.</b>, <i>Eupolyphagaudenostyla</i> Qiu, <b>sp. nov.</b>, <i>Eupolyphagareducta</i> Qiu, <b>sp. nov.</b>, and <i>Eupolyphagasimila</i> Qiu, <b>sp. nov.</b> New knowledge on some known species is added, including new distribution records and characteristics of females. Forty-five COI sequences were newly sequenced and a molecular species delimitation analysis was performed using ABGD method. Eighteen molecular operational taxonomic units were obtained by ABGD analysis, which are nearly consistent with the results of 2022-01-01T00:00:00Z20222026-04-08T12:23:14.667Z2025-04-04T08:35:16.51ZS-EPMC98486773676032710.3897/zookeys.1120.87483