Limnohydrobius tumidus

Identification to species level requires examination of genitalia and other microscopic features. The swollen or highly convex body form may help distinguish it from related Limnohydrobius species. The genus Limnohydrobius is distinguished from similar hydrophilid genera by a combination of characters including antennal structure and body proportions. Confirmation requires reference to LeConte's original description and subsequent taxonomic revisions.

Aquatic freshwater habitats, including ponds, lakes, and slow-moving streams. As a member of Hydrophilidae, it is associated with submerged vegetation and detritus in lentic or slow lotic environments. Specific microhabitat preferences within these systems remain undocumented.

Eastern and central United States: Maine, New York, Pennsylvania south to South Carolina, Florida, and Mississippi, west to Illinois and Indiana. The range spans the Atlantic Coastal Plain, Appalachian region, and portions of the Midwest.

As a member of Hydrophilidae, likely functions as a detritivore and scavenger in freshwater ecosystems, contributing to nutrient cycling and decomposition of organic matter in aquatic environments.

• Other Limnohydrobius speciesSimilar size, habitat, and general appearance; distinguished by body convexity and genitalia
• Hydrobius fuscipesOverlapping distribution and aquatic habitat; Hydrobius species generally larger with different antennal proportions
• Other Hydrobiusini generaShared tribe characteristics including aquatic habits; require detailed examination for separation

• water scavenger beetle
• aquatic insect
• freshwater
• North America
• LeConte 1855

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life