Eucoenogenes ancyrota

Author: (Meyrick, 1907)

Species Overview:

Adult: 18-25 mm wingspan; forewing ground colour silvery-grey, irrorated with white and with dark fuscous strigulae, and with a broad dark brown suffusion extending over costal half of wing from near base to two-thirds, then suddenly contracted and continued as a narrow and less defined costal suffusion to apex. Males with costal fold. Hindwings fuscous, darker posteriorly.
Larva: 13-15 mm long; head capsule brownish yellow; thorax and body dark reddish brown, each segment of abdomen bearing two tiny white spots dorsally; also well presented a rather similar spot on spiracles with several whitish hairs [Eucoenogenes ancyrota larva ].

Taxonomic Description:


Eucoenogenes ancyrota adult
External characters: 18-25 mm wingspan. Head light brownish; thorax grey-whitish, with two dark grey dorsal dots; abdomen grey. Forewing elongate, narrow, gradually dilated, termen subsinuate, little oblique; with strong costal fold reaching from base to middle of costa. Ground colour silvery-grey, irrorated with white and with more or less distinct dark fuscous strigulae; a broad dark brown suffusion, mixed with leaden, extending over costal half of wing from near base to two-thirds, then suddenly contracted and continued as a narrow and less defined costal suffusion to apex; posterior half of costa with pairs of short whitish strigulae; an irregular fuscous spot in disc, resting on edge of dark costal suffusion; a curved black linear mark from angle of costal suffusion at two-thirds; a series of six or seven short black linear marks before termen; a small fuscous apical spot. Cilia grey, irrorated with white, suffused with white towards base, on upper part of termen suffused with brown towards tips. Hindwings fuscous, darker posteriorly; cilia fuscous, with pale basal line (Meyrick, 1907).

male genitalia E. ancyrota
valvae natural position (showing position of spines)
Genitalia: Tegumen broad. Uncus notched apically; socii small. Neck of valva well developed; cucullus very broad, short; armed with several short spines on outer margin (inner surface), and several long spines on outer surface. Aedeagus short, thick, with several long cornuti.


External characters: Similar to male; forewing without costal fold.

female genitalia E. ancyrota
Genitalia: Sterigma with long lateral projections posteriorly; antrum well sclerotized; cingulum large, with some small spines, situated medially in ductus bursae. Corpus bursae pyriform, with two strong signa. Spines on surface of corpus bursae unequal in size: spines on median part very small, these surrounded by ring of large spines, all arranged in same direction; anterior part of ductus bursae with small spines which are not arranged orderly.


In Korea, larvae feed on the leaves of Ternstroemia japonica. Larvae of the first generation are present by mid May. They tie 2-3 leaves together to construct a shelter. Mature larvae pupate in their feeding site from late May to early June. Adults emerge after 7-10 days. Most adults are on wing by mid June (Bong-Kyu and Chang-Hoon, 1999).
In Japan, there are 2-3 generations per year (present in June, July and August), and the species overwinters in the pupal stage.

Host plants:

Ternstroemia spp. (Theaceae).


Larvae feed on the leaves of the host plant, tying them together to construct shelters.


India, Sri Lanka, Japan, Korea, Burma, Thailand, W. Malaysia, Brunei (Robinson et al., 1994).


Pheromone unknown.