Sirivanakarnius was originally proposed as a subgenus of Culex by Tanaka (2004), with boninensis Bohart, 1957 as its type and the only included species. Culex boninensis was regarded as a member of the Sitiens Group of subgenus Culex until Tanaka (2004) established subgenus Sirivanakarnius based on distinct characters of the adults and male genitalia.