Taxonomic study of the genus Erechthias (Lepidoptera, Tineidae) from the Ogasawara Islands, with two new records and four new species

This study reviewed the genus <i>Erechthias</i> Meyrick, 1880 on the Ogasawara Islands, Japan with regards to eight recognized species, two of which were known (<i>E. itoi</i> Moriuti & Kadohara, 1994 and <i>E. zebrina</i> (Butler, 1881)), two of which are newly recorded (<i>E. minuscula</i> (Walsingham, 1897) and <i>E. atririvis</i> (Meyrick, 1931)), and four of which are new species (<i>E. mirabilis</i> <b>sp. nov.</b>, <i>E. oculus</i> <b>sp. nov.</b>, <i>E. flavimacula</i> <b>sp. nov.</b>, and <i>E. nidumicola</i> <b>sp. nov.</b>). Photographs of adult specimens and of their genitalia as well as illustrations of wing venation are provided. A preliminary phylogenetic tree based on mitochondrial DNA (the partial COI region, DNA barcode region) includes seven <i>Erechthias</i> species. Furthermore, haplotype networks were also constructed using DNA barcode regions for three species distributed across three or more island groups (Mukojima Islands, Chichijima Islands, Hahajima Islands, and other Islands). All examined <i>E. flavimacula</i> <b>sp. nov.</b> and <i>E. nidumicola</i> <b>sp. nov.</b> had unique haplotypes and were divided into three units corresponding to the group of islands.