The Canthyloscelidae are a small family of midges closely related to the Scatopsidae.
Adults are small to medium-sized (2.5-9.0 mm) flies, relatively stout, usually dark coloured Nematocera with stout legs. They are associated with ancient woodland. Larvae are xylosaprophagous and live in the moist, rotting wood of stumps and fallen trees.
Most are considered endangered due to the vulnerability of their habitat.
Fifteen described species live in New Zealand, North America, South America, Japan and Russia, and one is known from the Jurassic fossil record.
Systematics Originally considered to be two separate families, the Synneuridae and the Canthyloscelidae. Haenni placed the Synneuridae as the subfamily Synneurinae. A phylogenetic reclassification by Amorim has reduced the Synneurinae into a synonymy of Canthyloscelinae.
Genus Canthyloscelis Edwards, 1922 Canthyloscelis antennata Edwards, 1922 Canthyloscelis apicata Edwards, 1934 Canthyloscelis balaena Hutson, 1977 Canthyloscelis brevicornis Nagatomi, 1983 Canthyloscelis claripennis Edwards, 1922 Canthyloscelis nigricoxa Edwards, 1922 Canthyloscelis pectinata Edwards, 1930 Canthyloscelis pectipennis Edwards, 1930 Canthyloscelis valdiviana Tollet, 1959 Genus Exiliscelis Hutson 1977 Exiliscelis californiensis Hutson, 1977 Genus Hyperoscelis Hardy & Nagatomi 1960 Hyperoscelis eximia (Boheman, 1858) Hyperoscelis veternosa Mamaev & Krivosheina, 1969 Genus Prohyperoscelis Kovalev 1985 Itat Formation, Russia, Bathonian Prohyperoscelis jurassicus † Kovalev, 1985 Genus Synneuron Lundström 1910 Synneuron annulipes Lundström, 1910 Synneuron decipens Hutson, 1977 Synneuron sylvestre Mamaev & Krivosheina, 1969 Synneuron eomontana Amorim & Greenwalt, 2020 Synneuron jelli Amorim & Greenwalt, 2020
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