Culex species (Larva & adult characters)

      Identifying characters are as follows:

• A long, slender body with a well-developed head and a distinct thorax that is wider than the head.
• The head is equipped with prominent antennae, mouth brushes for feeding, and small, simple eyes
• The presence of a long, narrow respiratory siphon in the 8th abdominal segment , typically bearing distinctive tufts of hairs or pecten spines.
• The larva hangs at an angle (about 45°) from the water surface, with only the tip of the siphon breaking the surface for respiration.
• The comb scales on the 8th abdominal segment and the arrangement of setae (bristles) are useful identification markers.  
•  Anal segment  bears four leaf-like tracheal gills surrounding the anus. The end of the abdomen contains a tuft of dorsal bristles and a ventral brush.
• Palmate hairs absent in the abdomen.

      Hence, the specimen seems to be larval stage of Culex species.

• Body is divisible into head, thorax & abdomen.
• Head bears two compound eyes.
• Legs are long fragile looking.
• Males have bushy, feathery antennae for detecting female wing-beat frequencies, while females have less bushy, thread-like antennae.​
• Males possess pincer-like claspers at the end of the abdomen for mating, absent in females.
• Females have comparatively shorter palps than the proboscis, while males’ palps are either as long as or longer than the proboscis.
• Only females bite and feed on blood to obtain nutrients for egg development; males feed exclusively on nectar and plant juices.
• Absence of hairs under their wings.
• Both sexes have brown, medium-sized bodies, but only females are responsible for transmitting diseases like West Nile virus, Japanese encephalitis, and filariasis.

           Hence, the specimen seems to be Adult male & female stage of Culex sp.

Systematic position: (Ruppert & Barnes 1994)

Kingdom: Animalia

   Sub Phylum: Uniramia

     Class:Insecta

          Order:Diptera

                  Genus: Culex

Medical Significance:

• Culex mosquitoes are more active at dusk and night, increasing the risk of disease spread during these times.​Expansion of Culex ranges due to climate and habitat changes has led to new outbreaks in previously unaffected areas.​Their medical importance makes them major targets for vector control and epidemiological surveillance.
• Culex females are responsible for spreading West Nile virus, which can cause severe neurological illness in humans.​ Japanese encephalitis, a viral brain infection common in Asia.​St. Louis encephalitis and Western/Eastern equine encephalitis, both serious mosquito-borne viral infections.​ Lymphatic filariasis (elephantiasis), caused by parasitic nematode Wuchereria bancrofti  leading to chronic disability.​Avian malaria and other bird-targeting diseases, impacting wildlife. Thus Culex mosquito plays crucial role in global public health due to their efficiency as vectors for multiple viral & parasitic diseases.