FIGURE 1. Limnosida frontosa Sars, 1862 in Redescription of Limnosida frontosa Sars, 1862 (Crustacea: Cladocera: Sididae), with evidence of possible incipient species differentiation

FIGURE 1. Limnosida frontosa Sars, 1862, females. (A, Lake Stensrudvann, Norway; B, L, Lake Konnevesi, Finland; C, D, Cheboksarskoe reservoir; E, F, H–K, Neva River estuary; G, Lake Toros, Karelia; M, from left to right: Lake Gassi, Gor'kovskoe reservoir, Neva River estuary). A, B, general lateral view. C, head, frontal view. D, antennule. E, distal end of basipodite, outer side. F, the same, dorsal side. G, seta on the dorsal basal part of antennal basipodite. H, distal end of proximal segment of upper antennal branch. I, distal end of upper antennal branch. J, distal end of lower antennal branch, lateral side. K, the same, dorsal side. L, distal end of basipodite, inner side. M, posterior valve margin.