The Nymphomyiidae are a family of tiny (2 mm) slender, delicate flies (Diptera). Larvae are found among aquatic mosses in small, rapid streams in northern regions of the world, including northeastern North America, Japan, the Himalayas, and eastern Russia. Around a dozen extant species are known, with two fossil species found in amber, extending back to the Mid Cretaceous. Under an alternative classification, they are considered the only living representatives of a separate, suborder called Archidiptera which includes several Triassic fossil members. The family has characteristics associated with the Nematocera as well as the Brachycera. The antennae are shortened as in the Brachycera and these flies are long, having a snout with vestigeal mouthparts, non-differentiated abdominal segments with large cerci. The wings are narrow and hair-fringed and have very weak venation. They are known to form cloud-like swarms in summer and the short-lived non-feeding adults have wings that fracture at the base shortly after mating.
Leptathamas is a spider genus of the jumping spider family, Salticidae, with one described species, which occurs only in New Guinea.
Anthomyzidae is small, slender, yellow to black flies with narrow and elongated wings, which may have distinct markings. Some species have greatly reduced wings. Fewer than 100 species are known, mostly from Europe. Although they occur in all major regions, they seem to be most varied in the Holarctic region.
Acrocerinae is a subfamily of small-headed flies in the family Acroceridae. Their larvae are endoparasites of araneomorph spiders, with the exception of Carvalhoa appendiculata which can develop as ectoparasitoids on their host spiders. Traditionally, the subfamily included the genera now placed in Cyrtinae and Ogcodinae, but the subfamily in this sense was found to be polyphyletic and was split up in 2019.
Prionomyrmex is an extinct genus of bulldog ants in the subfamily Myrmeciinae of the family Formicidae. It was first described by Gustav Mayr in 1868, after he collected a holotype worker of P. longiceps in Baltic amber. Three species are currently described, characterised by their long mandibles, slender bodies and large size. These ants are known from the Eocene and Late Oligocene, with fossil specimens only found around Europe. It is suggested that these ants preferred to live in jungles, with one species assumed to be an arboreal nesting species. These ants had a powerful stinger that was used to subdue prey. In 2000, it was suggested by Cesare Baroni Urbani that the living species Nothomyrmecia macrops and a species he described both belonged to Prionomyrmex, but this proposal has not been widely accepted by the entomological community. Instead, scientists still classify the two genera distinctive from each other, making Nothomyrmecia a valid genus.
Arostropsis is an extinct genus of broad-nosed weevil in the beetle family Curculionidae known from an Upper Eocene fossil found in Europe. The genus contains a single described species, Arostropsis groehni.
Philopotinae is a subfamily of small-headed flies. They have an arched body shape, as well as enlarged postpronotal lobes that form a collar behind the head. Their larvae are endoparasites of araneomorph spiders in the subgroup Entelegynae.
Electromyrmex is an extinct genus of ants in the formicid subfamily Dolichoderinae. The genus contains a single described species, Electromyrmex klebsi and is known from a group of Middle Eocene fossils which were found in Europe.
Oreoleptidae is a family of flies. The family was established in 2005 on the basis of the type species Oreoleptis torrenticola placed in the monotypic genus Oreoleptis. The only known species was collected from the Rocky Mountains where the larvae grow in torrential streams. Larvae have also been found in groundwater wells. The larvae are similar to those of Athericidae and Tabanidae but with long crocheted false-legs (prolegs) arising from abdominal segments 2-7. The larvae have hollow mandibular hooks.
Ogcodes is a genus of small-headed flies in the family Acroceridae. About 90 species have been described for the genus.
Archocyrtus is an extinct genus of small-headed flies in the family Acroceridae. The genus is known from compression fossils from the Late Jurassic Karabastau Formation of Kazakhstan. The genus is the only member of the subfamily Archocyrtinae.
Cyrtinella is an extinct genus of small-headed flies in the family Acroceridae. The genus is known from Baltic amber from the Eocene of Poland and Kaliningrad Oblast, Russia. It contains only one species, Cyrtinella flavinigra.
Glaesoncodes is an extinct genus of small-headed flies in the family Acroceridae. It is known from Baltic amber from the Eocene, though the locality is unknown. It contains only one species, Glaesoncodes completinervis.
Schlingeromyia is an extinct genus of small-headed flies in the family Acroceridae. The genus is known from Upper Cretaceous fossils in Burmese amber from Myanmar. It contains only one species, Schlingeromyia minuta.
Villalites is an extinct genus of small-headed flies in the family Acroceridae. It is known from Baltic amber from the Eocene, though the locality is unknown. It contains only one species, Villalites electrica.
Burmacyrtus is an extinct genus of small-headed flies of uncertain placement. The genus is known from Upper Cretaceous fossils in amber from Myanmar. It contains only one species, Burmacyrtus rusmithi.
Archaeterphis is an extinct genus of small-headed flies in the family Acroceridae. It is known from Baltic amber from the Eocene, though the locality is unknown. It contains only one species, Archaeterphis hennigi.
Eulonchiella is an extinct genus of small-headed flies in the family Acroceridae. It is known from Baltic amber from the Eocene, though the locality is unknown. It contains only one species, Eulonchiella eocenica.
Prophilopota is an extinct genus of small-headed flies in the family Acroceridae. It is known from Baltic amber from the Eocene.
Cyrtinae is a subfamily of the Acroceridae. Their larvae are endoparasites of araneomorph spiders in the subgroup Entelegynae.
