Scirtoidea

thumb|Scirtes hemisphaericus, North Wales

thumb|Eucinetus terminalis thumb|Eucinetus morio

Scirtoidea is a superfamily of beetles. It is traditionally considered to consist of four families: Clambidae, Decliniidae, Eucinetidae and Scirtidae. 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.

Clambidae is a family of beetles. They are known commonly as the minute beetles or the fringe-winged beetles. They are found worldwide on every continent except Antarctica.

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Decliniidae is a family of beetles belonging to Scirtoidea. It contains the single genus Declinia with two species, D. relicta and D. versicolor, found in the Russian Far East and Japan, respectively. Little is known of their ecology, and their larvae are unknown. Specimens of D. relicta were found with pollen grains in their gut.

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Eucinetus is a genus of plate-thigh beetles in the family Eucinetidae. There are at least four described species in Eucinetus. thumb|Eucinetus terminalis

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Elodes is a genus of marsh beetles in the family Scirtidae. There are more than 60 described species in Elodes. thumb|Elodes minuta

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Scirtes is a genus of marsh beetles in the family Scirtidae. There are more than 80 described species in Scirtes. thumb|Scirtes hemisphaericus

Prionocyphon is a genus of marsh beetles in the family Scirtidae. There are at least 20 described species in Prionocyphon.

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Tohlezkus is a genus of plate-thigh beetles in the family Eucinetidae. There are at least three described species in Tohlezkus.

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Euscaphurus is a genus of plate-thigh beetles in the family Eucinetidae. There are at least three described species in Euscaphurus.

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Sacodes is a genus of marsh beetles in the family Scirtidae. There are about seven described species in Sacodes. thumb|S. pulchella thumb|S. thoracica