Microcylloepus pusillus

Microcylloepus pusillus is a species of riffle beetle in the family Elmidae. It is found in North America.

Subspecies
These six subspecies belong to the species Microcylloepus pusillus:
 * Microcylloepus pusillus aptus (Musgrave, 1933)
 * Microcylloepus pusillus foveatus (LeConte, 1874)
 * Microcylloepus pusillus loedingi (Musgrave, 1933)
 * Microcylloepus pusillus perditus (Musgrave, 1933)
 * Microcylloepus pusillus pusillus (LeConte, 1852)
 * Microcylloepus pusillus similis (Horn, 1870)