Microvelia fontinalis

Distinguished from other Microvelia species by genitalic characters, particularly male paramere structure, requiring microscopic examination. Separation from sympatric Microvelia species such as M. americana and M. buenoi requires examination of male genitalia and subtle differences in body proportions. Small size and reduced wings separate it from larger veliids in the genus Velia and from the related family Gerridae.

Small-bodied veliid, generally measuring 2–3 mm in length. Body form slender with long, delicate legs adapted for locomotion on water surfaces. Coloration typically dark with possible pale markings, though specific patterning for this species is not well documented. Wings reduced or absent (micropterous or apterous), a common trait in Microvelia species.

Freshwater surface habitats, particularly springs, spring runs, and small streams with moderate flow. The species epithet indicates preference for fountain or spring-like water sources. Found on the water surface film rather than submerged.

Recorded from North America; specific range details limited due to sparse collection records. The type locality and precise distribution within North America require further documentation.

Surface-dwelling, using middle legs for propulsion and hind legs for steering while foraging on the water surface film. Like other veliids, likely preys on small organisms trapped at the water surface.

Predator on small invertebrates at the water surface, contributing to nutrient transfer between aquatic and terrestrial food webs. Serves as prey for larger aquatic and terrestrial predators.

• Microvelia americanaOverlapping North American range and similar small size; distinguished by male genitalic structure.
• Microvelia buenoiSympatric in eastern North America; requires genitalic examination for reliable separation.
• Rheumatobates speciesSimilar habitat use but distinguished by extremely long antennae and different body proportions.

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon