Elachista
Elachista is a genus of gelechioid moths described by Georg Friedrich Treitschke in 1833. It is the type genus of the grass-miner moth family (Elachistidae). This family is sometimes (in particular in older sources) circumscribed very loosely, including for example the Agonoxenidae and Ethmiidae which seem to be quite distinct among the Gelechioidea, as well as other lineages which are widely held to be closer to "Oecophora" than to "Elachista" and are thus placed in the concealer moth family Oecophoridae here. These grass-miners are very small moths with the "feathery" hindwings characteristic of their family. They are  essentially found worldwide, except in very cold places and on some oceanic islands; as usual for Gelechioidea, they are most common in the Palearctic however. They usually have at least one, sometimes as many as three light bands running from leading to trailing edge of their forewing uppersides. Some species, however, have upper forewings that are mostly white. Selected species. Not all species of this large genus have been discovered yet, let alone validly described and named. Several small genera, e.g. "Biselachista" and "Cosmiotes", are here included in "Elachista" as junior synonyms (see below). They seem to be at least  as closely related to "E. bifasciella" (the type species of the present genus) than other species commonly placed here, if not actually closer. In addition, "Elachista" contains several cryptic species complexes – such as the one around "E. dispunctella" and "E. triseriatella" – whose systematics and taxonomy are still not fully resolved. A number of "Elachista" species have been assigned to one of several groups, which may or may not be monophyletic, and whose names in the literature do not consistently follow the usual taxonomic practice (i.e. using as namesake the group-member which was described first). Some of these groups are  placed in either of the two large subgenera Elachista" ("Aphelosetia") and Elachista" ("Elachista"). Other proposed subgenera – the small "Elachista" ("Dibrachia") and "Elachista" ("Hemiprosopa") – are here included in the species of unclear relationships; like some small species-groups, they stand a chance of rendering the two larger subgenera paraphyletic if accepted as distinct, but seem too unlike them to warrant placement in either. Subgenus "Elachista" ("Aphelosetia"). "argentella" group (sometimes in "bedellella" group) "bedellella/unifasciella" group (including "collitella" group) Elachista" ("Aphelosetia") "incertae sedis Subgenus "Elachista" ("Atachia"). These are sorted in the presumed phylogenetic sequence. "gerasmia" group, "gerasmia" section "gerasmia" group, "catarata" section  erebophthalma group "puplesisi" group Subgenus "Elachista" ("Elachista"). ""Cosmiotes""/"freyerella" group "tetragonella" group Elachista" ("Elachista") "incertae sedis Other groups. Some "Elachista" are divided into groups whose relationships to the two large subgenera requires further study, including: Section::::"Incertae sedis". Additional "Elachista" species are of even more uncertain relationships than usual for this genus: Excluded species. The following species are excluded from the genus "Elachista", but have not yet been placed in another genus: Synonyms. Invalid scientific names (junior synonyms and others) of "Elachista" in the circumscription as presented here are: