Issikiomartyria trochos, Imada, Yume & Kato, Makoto, 2018

Imada, Yume & Kato, Makoto, 2018, Descriptions of new species of Issikiomartyria (Lepidoptera, Micropterigidae) and a new genus Melinopteryx gen. n. with two new species from Japan, Zoosystematics and Evolution 94 (2), pp. 1-25 : 13-14

Issikiomartyria trochos sp. n. Figs 1f, 14, 15

Material examined.

Holotype: JAPAN [HONSHU] 1♂ collected by YI on 19.VI.2015 at Mahirudake-rindou (410 m), Nishiwaga-cho, Iwate Pref (Fig. 19:8), NMNS.

Paratypes: JAPAN [HONSHU] 3♂1♀ collected by YI on 19.VI.2015 at same as holotype locality, NMNS.

Additional materials: 1♂ collected by YI on 11.VI.2016 at Kodera-keikoku (580 m), Ohemachi, Yamagata Pref (Fig. 19:9), KUHE; 2♂ collected by YI on 12.VI.2016 at Aosawa Sakata-shi, tunnel (340 m), Yamagata Pref (Fig. 19:10), KUHE.

Type locality.

Japan, Iwate Pref: Mahirudake-rindou (Honshu).

Diagnosis.

Male tergum X with middle portion as large as lateral portions, lateral portions extending dorsally. Female corpus bursae with tiny sclerites on membrane surface near caudal end.

Description.

Head dark brown, naked and glossy on both side, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male; with 62 (61-65) flagellomeres in males (n= 3). Labial palp 1-segmented. Forewing length 4.4 mm (4.2-4.7, n=8) in male.

Male abdomen and genitalia (Fig. 14). Mid-dorsal length of segment IX ring about 1/4 of ventral length. Valva with a proximo-ventral ridge; inner ventral margin broad without concavity. Aedeagus with two pairs of dorsal ridges: a pair of shorter distal fins and a pair of longer proximal fins oriented about proximal quarter of aedeagal length, extending upwards; with a pair of lateral triangular fins extending horizontally. Tergum X with developed medial part, as large as lateral portions; lateral portions expanded dorsally.

Female abdomen and genitalia (Fig. 15). Segment IX forming a complete ring, strongly sclerotized; with a pair of dorso-lateral protrusions near base. Segment X consisting of a pair of lateral sclerites and a dorsal sclerotized plate; dorsal plate almost rectangular, slightly projected in middle. Corpus bursae large, globular, membranous, with long narrow neck region anteriorly; membrane surface with tiny sclerites scattered near caudal end; with signa composed of four saggitate sclerites near proximal end. Ductus spermathecae arising from a round concavity. Genital chamber smooth without sclerites, and a large fan-shaped sclerite ventrally.

Remarks.

Issikiomartyria trochos sp. n. is most similar to I. catapasta sp. n. in that lateral parts of tergum X extending dorsally, but can be distinguished by the following traits: dorso- and latero-basal aedeagal fins separated from each other; female genital chamber without small sclerites; corpus bursae with tiny sclerites on membrane surface near caudal end.

Etymology.

The specific name is a noun in apposition from the Greek word, " trochos " (wheel, disk), referring to the unusually extended form of tergum X of this species.

Distribution.

This species has been found from the northern part of the main island of Japan (Honshu: Yamagata Pref.).

Bionomics.

Larvae feed on the thalli of Conocephalum conicum . The habitat is a forest path along mountain streams of cool-temperate forests at 340-595 m, where Fagus crenata and Quercus crispula dominate.