Undopterix is an extinct genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of moths within the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Eolepidopterigidae, containing two species. Undopterix sukatshevae is known from Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

. The fossil remains are dated to the Lower Cretaceous.

The second species, Undopterix cariensis is known from the Crato Formation

Crato Formation

The Crato Formation is a geologic formation of Early Cretaceous age in northeastern Brazil's Araripe Basin. It is an important Lagerstätte for palaeontologists. The strata were laid down mostly during the early Albian age, about 108 million years ago, in a shallow inland sea...

 in Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

.

Taxonomy

Undopterix was initially classified in the Micropterigidae

Micropterigidae

Micropterigoidea is the superfamily of "mandibulate archaic moths", all placed in the single family Micropterigidae, containing currently about 20 living genera. They are considered the most primitive extant lineage of Lepidoptera ....

, but was later transferred to the Eolepidopterigidae family. It was designated as the type-genus for the new family Undopterigidae by Kozlov in 1988, but this is disputed.