Mosquito

Mosquitoes, specifically Culex and Aedes species, are holometabolous insects belonging to the family Culicidae, order Diptera. Their lifecycle comprises four distinct stages: egg, larva, pupa, and adult, typically completed within 7–10 days under optimal ambient temperatures (25–30 °C) and high humidity. Adult females are obligate blood-feeders, requiring a blood meal rich in protein and iron for ovarian development and subsequent oviposition, while males and non-gravid females subsist on nectar and plant juices. A single gravid female can lay between 50 and 300 eggs per clutch, with Aedes spp. typically laying on damp substrates and Culex spp. ovipositing egg rafts directly on water; adult longevity averages 2–3 weeks depending on species and environmental factors. Key identifying features include species-specific wing vein patterns, scutellar scaling, and palpal lengths that differentiate them from other nematocerans like chironomids.

Mosquito activity patterns vary significantly between genera: Culex species are primarily crepuscular and nocturnal, exhibiting peak biting during dusk and dawn hours, while Aedes species are generally diurnal, actively seeking hosts throughout the day. Host location is a complex process mediated by multi-modal sensory cues, with gravid females detecting CO₂ plumes, lactic acid, octenol, and body heat gradients from distances up to 30 meters. Upon close approach, visual cues and humidity gradients guide the final landing and probing phases. Female mosquitoes inject anticoagulants and pain suppressants during feeding, facilitating blood uptake and often leading to localized inflammatory responses in hosts. Their impact extends beyond nuisance, as they are principal vectors for serious arboviral diseases and parasitic infections like West Nile, Zika, Dengue, Chikungunya, and filariasis, posing significant public health risks.