Daphnia similis

Popova, Ekaterina V., Petrusek, Adam, Kořínek, Vladimír, Mergeay, Joachim, Bekker, Eugeniya I., Karabanov, Dmitry P., Galimov, Yan R., Neretina, Tatyana V., Taylor, Derek J. & Kotov, Alexey A., 2016, Revision of the Old World Daphnia (Ctenodaphnia) similis group (Cladocera: Daphniidae), Zootaxa 4161 (1), pp. 1-40 : 32

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.