Heterocloeon is one of two genera along with Acentrella that can be differentiated from other baetids by the presence of a conical mesonotal projection. All but one species of this genus can be further separated from Acentrella by the lack of venation in the tiny hindwings. There is little evidence that the species of Heterocloeon are of much significance to anglers.
Where & when
In 8 records from GBIF, adults of this genus have been collected during July (38%), August (25%), June (13%), September (13%), and April (13%).
In 6 records from GBIF, this genus has been collected at elevations ranging from 440 to 2690 ft, with an average (median) of 981 ft.