Scirtoidea is a superfamily of beetles.[1] It is traditionally considered to consist of four families: Clambidae, Decliniidae, Eucinetidae and Scirtidae.[2] However, genetic studies have suggested that Clambidae and Eucinetidae belong to a separate superfamily Clamboidea, which also includes Derodontidae. Scirtoidea and Clamboidea are the two earliest diverging lineages of living polyphagans.[1]
Two extinct families have also been assigned to this group:
† Mesocinetidae Kirejtshuk and Ponomarenko 2010 Late Jurassic-Early Cretaceous (Asia)
^Friedrich, F.; Beutel, R. G. (2006). "The pterothoracic skeletomuscular system of Scirtoidea (Coleoptera: Polyphaga) and its implications for the high-level phylogeny of beetles". Journal of Zoological Systematics and Evolutionary Research. 44 (4): 290–315. doi:10.1111/j.1439-0469.2006.00369.x.