title: A replacement name for Dayus Gerken, 2001 (Crustacea, Peracarida, Cumacea), preoccupied by Dayus Mahmood, 1967 (Insecta, Hemiptera, Cicadellidae).
abstract: A replacement name is proposed for genus Dayus Gerken, 2001 (Crustacea: Peracarida: Cumacea), preoccupied by Dayus Mahmood, 1967 (Insecta: Hemiptera: Cicadellidae). The following changes are proposed: Jennidayus new replacement name = Dayus Gerken, 2001 (nec Mahmood 1967); Jennidayus pharocheradus (Gerken, 2001), comb. n. = Dayus pharocheradus Gerken, 2001; Jennidayus acanthus (Gerken, 2001), comb. n. = Dayus acanthus Gerken, 2001; Jennidayus makrokolosus (Gerken, 2001), comb. n. = Dayus makrokolosus Gerken, 2001.
authors.affiliation: Institute of Entomology, The Special Key Laboratory for Development and Utilization of Insect Resources, Guizhou University, Guiyang, Guizhou PR China, 550025 ; Special and Key Laboratory of Functional Materials and Resource chemistry of Guizhou Provincial Education Department, Anshun University, Anshun, Guizhou PR China, 561000.
authors.forename: Yu-Bo
authors.initials: YB
authors.lastname: Zhang
authors.affiliation: University of Alaska, Anchorage, 3211 Providence Dr., Biological Sciences, Anchorage, Alaska 99508, U.S.A.
authors.forename: Sarah
authors.initials: S
authors.lastname: Gerken
authors.affiliation: Institute of Entomology, The Special Key Laboratory for Development and Utilization of Insect Resources, Guizhou University, Guiyang, Guizhou PR China, 550025.
authors.forename: Xiang-Sheng
authors.initials: XS
authors.lastname: Chen
keywords: Crustacea; Cumacea; Peracarida; homonym; replacement name