The Gelechiidae are a family of moths belonging to the homonymous and little studied superfamily Gelechioidea.
Their relationships with other families and demarcation of the same family have been the subject of considerable controversy.
These moths are generally very small, with narrow wings and fringed.
The larvae of many species feed internally on various parts of their host plant, sometimes causing galls ( excrescence, which forms on the leaves, branches, trunk and roots of plants and due to parasitic fungi, bacteria , insects or mites).
By the end of the 20th century, over 900 genera with a total of more than 4,500 species have been placed in this family,
with about 650 known species in North America alone.
Although these figures are certainly overcome thanks to many of the revaluation of the superfamily Gelechioidea
and new descriptions of moths, nonetheless serve to give an idea of the enormous biodiversity in this important family.
Being abundant and fruitful, many species are agricultural pests.