See text The Cylindrotomidae or long-bodied craneflies are a family of crane flies.

[4][5][1][6][7][8] They are mostly large flies of around 11–16 mm and yellowish to pale brownish in colour.

The larvae are all phytophagous (with the exception of the genus Cylindrotoma) and are found living on terrestrial, semiaquatic and aquatic mosses.

Although they likely split off from their closest relatives, Tipulidae, during the Jurassic,[9] there are no fossils of the group known until the Paleogene, which belong to the living genera Cylindrotoma and Diogma and the extinct Cyttaromyia, the oldest dating to around 56 million years ago.

It is likely that the family only substantially diversified during the Cenozoic, with fossil species diversity centered in Baltic Amber and western North American compression faunas such as the Green River Formation and Florissant Formation.