FIGURE 1. Hybrid form Bythotrephes brevimanus x B in Morphological assessment of the North Eurasian interspecific hybrid forms of the genus Bythotrephes Leydig, 1860 (Crustacea: Cladocera: Cercopagididae)

FIGURE 1. Hybrid form Bythotrephes brevimanus x B. cederströmii, females (Rybinskoe Reservoir, Central European Russia). A, general lateral view. B, dorsal seta on proximal part of antennal basipodite. C, setae of distal end of first endopodital segment of tl I. D, E, the same of second endopodital segment of tl I. F, distal part of protopodites of tl II and tl III, outer view. G, apical setae of caudal process. H–R, caudal process and postabdominal and caudal claws. S, caudal process with highly sclerotized parts.