FIGURE 4 in Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea: Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig

FIGURE 4. Bythotrephes arcticus Lilljeborg, adult parthenogenetic females, lake 1 (basin of the River Tchernaya, Bol'shezemelskaya tundra, Arkhangel'skaya region, North-Eastern European Russia). A, anterior seta of second segment of endopodite of thoracic limb of third pair (tl III) (C, see Fig. 2). B, proximal part of anterior terminal seta of tl III (D, see Fig. 2). C, armament of posterior subterminal seta of tl III (G, see Fig. 2). D, distal part of pseudognathobase of tl III (pore is arrowed). E, outer terminal seta of tl IV (L, see Fig. 2). F, inner terminal seta of tl IV. G, pseudognathobase of tl IV (pore is arrowed). H, distal part of mandible. I, "postabdomen" and proximal part of caudal process (abd = posterior abdominal segment, p/abd = postabdomen). J, mandibular maxillar process. K, papillae of maxillar process. Scale bars: I =250 µm; H = 50 µm; A, D, E = 25 µm; B, C, F, G =20 µm; J = 10 µm; K= 5 µm.