Dayus is a genus of leafhoppers that belongs to the subfamily Typhlocybinae. Species belonging to this genus are distributed across the Indomalayan realm including China, Taiwan, Japan, Thailand, Australia, Fiji and Samoa.
Taxonomy The genus was established in 1967 by Mahmood with Dayus elongatus from Singapore. Subsequently in 1971, Dworakowska, a polish entomologist, would describe Dayus takagii from Japan and transferred Dayus upoluanus from Western Samoa and Dayus euryphaessus from Australia and Fiji to this genus. Then in 1978, Dworakowska and Viraktamath, an Indian entomologist, would describe Dayus formosus. Qin and Zhang (2007) would describe three new species from China, they are: Dayus lii, Dayus membranaceus, and Dayus lamellatus. In 2013, Yu and Yang would describe three new species from China: Dayus bifurcatus, Dayus trifurcatus and Dayus serratus. Dayus furcatus was described in 2021.Xu, Ye & Dietrich, Christopher & Qin, Daozheng. (2021). Description of new species of two genera Dayus Mahmood and Znana Dworakowska from Thailand (Hemiptera: Cicadellidae: Typhlocybinae). Journal of Asia-Pacific Entomology. 24. 10.1016/j.aspen.2020.12.018.
Species This genus contains 12 described species. They are listed below: Dayus bifurcatus Yu and Yang, 2013- China Dayus elongatus Mahmood, 1967- Singapore (Type species) Dayus euryphaessa (Kirkaldy, 1907) - Australia and Fiji Dayus formosus Dworakowska and Viraktamath, 1978 - Taiwan Dayus furcatus Xu et al, 2021a- Thailand Dayus lamellatus Qin & Zhang, 2007- China Dayus lii Qin & Zhang, 2007- China Dayus membranaceus Qin & Zhang, 2007- China Dayus serratus Yu and Yang, 2013- China Dayus takagii Dworakowska, 1971- Japan Dayus trifurcatus Yu and Yang, 2013- China Dayus upoluanus Dworakowska, 1971 Western Samoa
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