''Imma monocosma'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family

Immidae Immoidea is a superfamily of pantropical moths containing only the family Immidae comprising ten genera with around 250 species, over half of them in the genus ''Imma''. Many are brightly coloured and diurnal. The position of this group is curr ...

. It was described by

Alexey Diakonoff Alexey Nikolaievich Diakonoff (1 March 1907 – 20 September 1989), also transliterated as Alexej Nikolajewitsch Diakonoff, was a Russian–Dutch entomologist who specialised in Microlepidoptera. His parents immigrated to the Netherlands East I ...

and Yutaka Arita in 1979. It is found on the Japanese islands of

Kyusyu is the third-largest island of Japan's Japanese archipelago, five main islands and the most southerly of the four largest islands (i.e. excluding Okinawa Island, Okinawa). In the past, it has been known as , and . The historical regional name ...

and

Honshu , historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separ ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan of ...

is 20–22 mm for males and 24–25 mm for females. The forewings are light fuscous, rather dull, with hardly any purplish tinge and with some slight pale greyish opalescence in certain lights. The costal edge is pale yellow and the posterior half of the wing is densely suffused with light ochreous yellow, the edge of this colour with a deep excision in the middle, including a darker fuscous round dot on its top, on the middle of the closing vein, the yellow half dusted with light fuscous, except anteriorly and on the costa. There is a strongly curved transverse row of suffused and partly interconnected small fuscous interneural spots from below one-third of the costa to the tornus, running well before the termen, followed by elongate, wedge-shaped fuscous marks on the ends of the veins and a slender pale leaden-metallic marginal line from the costa before the apex to above the tornus, sometimes entirely obliterate. The hindwings are pale grey fuscous, with a slight silky gloss, becoming slightly darker beyond the middle posteriorly, the costa pale except towards the apex., 1979
"A survey of the Japanese species of the ''Anthophila'' Haworth and ''Eutromula'' Froelich and their early stages (Lepidoptera: Choreutidae), with an appendix"
''Zoologische Verhandelingen'' 166: 1–42.

References

Moths described in 1979 Immidae Moths of Japan {{Immidae-stub