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• Aquatic Macros

1.             Antennae with whorls of long setae on most segments (Fig. 1.1); the small unfringed gills
                on segment 1 forked (Fig. 1.2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

                Antennae with only sort setae (Fig. 1.3); the small gills on segment 1 single; uncommon.
                . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Litobrancha recurvata

2.             Frontal process of head forked (Fig.1.4). . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ephemera
              
                Frontal process of head rounded, not forked (Fig. 1.5). . . . . . . . . . . . . . . . . .Hexagenia