There are 4 genus of mosquitoes that transmit dirofilariasis, Ades, Culex, Anopheles, and Mansonia. Insect hosts are most frequently mosquitoes of the genera "Culex" and "Anopheles". This Penicillium species also causes mortality for the mosquito Culex quinquefasciatus. West Nile virus is primarily transmitted by mosquitoes, mostly species of "Culex". The London Underground mosquito is a form of mosquito in the genus "Culex". Wolbachia has enhanced multiple arboviruses in Culex tarsalis mosquitoes. They are infected by mosquitoes (the vectors), primarily of the "Culex" species. Within Diptera they constitute the family Culicidae (from the Latin "culex" meaning "gnat"). JEV is generally spread by mosquitoes, specifically those of the "Culex" type. Depending on the species, the adult "Culex" mosquito may measure from . Nonanal has been identified as a compound that attracts "Culex" mosquitoes. The other mosquito species on the island, "Culex quinquefasciatus," was not eliminated. Nonanal has been identified as a compound that attracts "Culex" mosquitoes, perhaps pheromonally. It is taxonomically regarded as a member of the "Culex pipiens" species complex. Terror works with Hellfire against a cult under the demon, Culex.