Uranotaenia sapphirina

Larvae and adult females can be distinguished from the sympatric congener Uranotaenia socialis using morphological keys based on specific structural characters; an identification key is provided in Mexican faunal studies. Adults are small mosquitoes with characteristic features of the genus Uranotaenia. Accurate identification requires examination of genitalic structures in adults and specific larval setal arrangements.

Semi-permanent and permanent water bodies including swamps, marshes, and woodland pools with abundant vegetation. Larvae inhabit ground-level natural habitats in conservation areas and wetland environments. Collections have been made in association with Anopheles albimanus, Culex erraticus, Mansonia titillans, and Uranotaenia lowii in aquatic habitats.

Eastern North America from southern Canada (Ontario, Quebec, Manitoba, New Brunswick) through the United States to Florida and west to Texas. Mexican records from 18 states including Campeche, Chiapas, Colima, Guerrero, Hidalgo, Jalisco, Mexico City, Mexico State, Michoacán, Morelos, Oaxaca, Quintana Roo, Sinaloa, Tabasco, Tamaulipas, Veracruz, and Yucatán. Also recorded in Cuba. Recent detection in New Brunswick, Canada (2022-2024) suggests range expansion.

Adult activity documented from May through October in north central Illinois. Overwinters as adults. Canadian collections span late May to late September, with peak activity in mid-summer to early autumn.

Females are specialist predators of annelids (earthworms and leeches), with 100% of identified blood meals from annelids in Florida populations. In the northeastern United States, 47.6% of identified meals were solely annelid, with some individuals containing mixed annelid-avian bloodmeals and rare mammalian or avian meals alone. The mud earthworm Sparganophilus tennesseensis is the most common identified host. Adults of both sexes feed on sugar sources.

• Sparganophilus tennesseensis - primary blood hostMud earthworm, most common host in northeastern US populations
• annelids - primary blood hostSpecialist feeding on earthworms and leeches
• leeches - blood hostFreshwater leeches documented as hosts through field observations
• Turdus migratorius - occasional blood hostAmerican robin, identified in mixed bloodmeals in northeastern US

Overwinters as adults. Larvae develop in aquatic habitats. Specific details of egg deposition, larval instars, and pupal duration not documented in available sources.

Females exhibit specialized predatory behavior targeting annelid hosts, with field observations documenting feeding on Sparganophilus worms and freshwater leeches. Sugar-feeding behavior documented in Florida populations. Readily collected using CDC miniature CO2 light traps, peat fiber resting boxes, gravid traps, and backpack aspirators.

Predator of annelids in wetland ecosystems. Host for viral pathogens including nucleopolyhedrovirus and Cypovirus (Reoviridae). Virus detected in specimens includes Eastern equine encephalomyelitis virus and West Nile virus, though vector competence remains unclear; likely dead-end or bridge vector rather than primary vector.

Not a significant vector of human pathogens due to specialized annelid-feeding behavior. Detection in new regions (e.g., New Brunswick, Illinois) serves as indicator species for climate-driven range expansion and changing faunal diversity. Contributes to mosquito biodiversity assessments and ecological monitoring programs.

• Uranotaenia lowiiSympatric congener that feeds exclusively on anurans (frogs and toads) rather than annelids; distinguished by host association and molecular/morphological characters
• Uranotaenia socialisSympatric congener in Mexico and southeastern US; distinguished by specific larval and adult female morphological characters detailed in identification keys

• mosquito
• specialist predator
• annelid feeder
• wetland species
• range expansion
• non-vertebrate host

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Uranotaenia sapphirina Osten Sacken (Insecta: Diptera: Culicidae: Culicinae)
• The Distribution of Uranotaenia sapphirina and Ur. socialis in Tabasco, Southern Mexico
• First detection of mosquito Uranotaenia sapphirina (Diptera: Culicidae) in New Brunswick, Canada
• A New Record of Uranotaenia sapphirina and Aedes japonicus in Lee and Ogle Counties, Illinois
• Identification of Uranotaenia sapphirina as a specialist of annelids broadens known mosquito host use patterns
• Evidence of Uranotaenia sapphirina (Diptera: Culicidae) feeding on annelid worms in the Northeastern United States