Microcylloepus pusillus is a species of riffle beetle in the family Elmidae. It is found in North America.
Subspecies There are no valid subspecies that belong to the species Microcylloepus pusillus. One former subspecies M. pusillus similis (Horn, 1870) is considered a separate species, M. similis. The following four former subspecies are synonyms of M. pusillus: Microcylloepus pusillus aptus (Musgrave, 1933) Microcylloepus pusillus foveatus (LeConte, 1874) Microcylloepus pusillus loedingi (Musgrave, 1933) Microcylloepus pusillus perditus (Musgrave, 1933)
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