Heterocloeon is one of two genera along with Acentrella that can be differentiated from other baetids by the presence of a conical mesonotal projection (Conical mesonotal projection: small cone shaped spike sticking up from the top and front part of the middle thorax segment.). All but one species of this genus can be further separated from Acentrella by the lack of venation (Venation: The pattern in which the veins on the wings of an insect are arranged. It is usually one of the most useful identifying characteristics.) in the tiny hindwings. There is little evidence that the species of Heterocloeon are of much significance to anglers.
» Genus Heterocloeon (Tiny Blue-Winged Olives)
12 species aren't included.
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