VCSU Macro-Invertabrate Lab
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Order Ephemeroptera

Group 2

Family Caenidae - Enlarged gills on abdominal segment two operculate, meaning they cover other gills, meet along the midline and are rectangular in shape (Fig. 1). The overall appearance is similar to Figure 2.

Caenidae gills Caenidae body
Family Leptohyphidae - Gills on segment two operculate but do not meet at the midline and are triangular in shape (Fig. 3). Generally appear as in Figure 4.

Leptohyphidae gills Leptohyphidae body
Family Heptageniidae - Head is greatly flattened horizontally (Fig. 5), gills not operculate. Overall appearance like Figure 6.

Heptageniidae head Heptageniidae body

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