Culex tritaeniorhynchus

''Culex (Culex) tritaeniorhynchus'' is a species of mosquito and is the main vector of the disease Japanese encephalitis. This mosquito is a native of northern Asia, and parts of Africa (northeast and sub-Saharan). Females target large animals for blood extraction, including cattle and swine, and are strongly anthropophilic.

Habitat

The larval habitat of ''Cx. tritaeniorhynchus'' primarily consists of low lying water logged areas such as grasses and fallow rice fields, but this species can also be found in wells, ponds, ditches and has been reported in urban environments in close proximity to human populations, such as water storage containers in houses. ''Culex tritaeniorhynchus'' is extremely common and widespread. It can be found in locations where the annual mean temperature ranges from 8.2 - 28.9°C, with elevations of a maximum 838m above sea level. Recorded presence of ''Cx. tritaeniorhynchus'' through surveys and mosquito collections list the species as being present in Bangladesh, Cambodia, India, Indonesia, Malaysia, Myanmar, Nepal, Singapore, Sri Lanka, Thailand and Viet Nam. Attempts have been made to model the distribution of ''Cx. tritaeniorhynchus'' using species distribution models; the predicted geographic distribution of the vector in 2011 can be seen below, however, the species may have expanded its distribution in current years due to changes in global climate.

Morphology and biology

The mosquito species ''Culex tritaeniorhynchus'' Giles is part of the ''Culex vishnui'' subgroup, which also includes ''Culex pseudovishnui'' Colless and '' Cx. vishnui'' Theobald. As the species are very morphologically similar, it is often difficult to identify the adult specimens collected from the field. ''Cx.tritaeniorhynchus'' is a relatively small, reddish brown species. It can be identified by the dark brown scaling on the vertex and scutum, the accessory pale patches basal to the pale band on the ventral surface of the proboscis, and the narrow apical dark ring on the hind femur.

Biting habits

Adult emergence typically commences around mid-afternoon, and reaches a maximum around dusk ''. Cx. tritaeniorhynchus'' generally has a biphasic biting profile - with feeding peaking around 7pm, declining throughout the midnight hours, then peaking again around 3am. Periodicity can change dramatically depending on the location, season and climate; further studies are required to determine habits of this vector at each of its different distributions as information on biting activity of vectors can play a vital role in personal protection measures, vector control and biting prevention. ''Culex tritaeniorhynchus'' is predominantly an exophilic species which rest outdoors after taking a blood meal, however, this also varies based on geographic location.

References

External links

Extra information, photograph, additional references

{{Taxonbar, from=Q3007103

tritaeniorhynchus
Insect vectors of human pathogens
Insects described in 1901