Revision of the Old World Daphnia (Ctenodaphnia) similis group (Cladocera: Daphniidae) Author Popova, Ekaterina V. Author Petrusek, Adam Author Kořínek, Vladimír Author Mergeay, Joachim Author Bekker, Eugeniya I. Author Karabanov, Dmitry P. Author Galimov, Yan R. Author Neretina, Tatyana V. Author Taylor, Derek J. Author Kotov, Alexey A. text Zootaxa 2016 4161 1 1 40 journal article 10.11646/zootaxa.4161.1.1 9b4d669b-6350-4020-8edf-4c7b9e8fa5d1 1175-5326 272238 C2A54ABA-7299-4601-A852-D9B1635443DC Key for determination of species from the D. similis group in Old World based on male characters 1 Anal teeth as in female (not reduced).............................................................. .. D. similis - Anal teeth in distal portion of postabdomen reduced in size and number.......................................... 2 2 Compound eye very large, occupies almost whole anterior portion of head, which forms an inflated dome....... D. sinensis - Compound eye relatively small, anteriormost portion of head without a dome...................................... 3 3 Fornix rounded; usually distalmost anal tooth usually relatively strong; no additional seta on exopodite V..... D. similoides - Fornix sharp and pointed; distalmost anal teeth minute; additional seta on exopodite V............... D. inopinata sp. nov .