Optioservus
Guides
Promoresia tardella
Promoresia tardella is a species of riffle beetle in the family Elmidae, originally described by Fall in 1925. The species has undergone taxonomic reclassification, with modern sources treating it as a synonym of Optioservus tardellus. It has been recorded from North America, specifically from Vermont in the United States. As an elmid beetle, it likely inhabits freshwater environments, though specific ecological details remain poorly documented.