Issikiomartyria leptobelos, 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 : 10

Issikiomartyria leptobelos sp. n. Figs 1d, 10, 11

Material examined.

Holotype: JAPAN [HONSHU] 1♂ collected by YI on 15.VI.2015 at Hachimori (100 m), Happo-cho, Akita Pref (Fig. 19:5), NMNS.

Paratype: JAPAN [HONSHU] 9♂2♀ collected by YI on 15.VI.2015 at same locality, NMNS.

Type locality.

Japan, Akita Pref: Hachimori (Honshu).

Diagnosis.

Apical part of valva digitiform. Tergum X longer than 3/4 of valva.

Description.

Head dark brown, naked and glossy on both sides, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna longer than forewing in male; with 56 (45-61) flagellomeres in males (n=5). Labial palp 1-segmented. Forewing length 4.5 mm (4.0-4.7, n=9) in male.

Male abdomen and genitalia (Fig. 10). Mid-dorsal length of segment IX ring about 1/4 of ventral length. Valva with digitiform, elongated apex; with a tiny proximo-ventral ridge. Aedeagus straight, with two pairs of dorsal fins: a pair of shorter, distal fins and a pair of longer proximal fins extending vertically; with a pair of lateral triangular fins extending upwards. Tergum X with squarish medial part, longer than 3/4 of valva; with a pair of protrusions disto-dorsally.

Female abdomen and genitalia (Fig. 11). Segment IX forming a complete ring, strongly sclerotized; strongly concave dorso-laterally. Segment X consisting of a pair of lateral sclerites and a dorsal sclerotized plate: lateral sclerite simple, broader than long; dorsal sclerite rounded at apex. Corpus bursae large, globular, membranous, with signa composed of four sclerites near proximal end. Ductus spermathecae arising from a round concavity. Genital chamber with a small, umbrella-shaped sclerite.

Remarks.

Issikiomartyria leptobelos sp. n. is unique in valva with the digitiform apex in the male. This species is most similar to I. hyperborea sp. n., but can be distinguished by the segment IX without a concavity at lateral and ventral sides in the female.

Etymology.

The specific name is a compound noun in apposition derived from the Greek words transliterated into Latin, “leptos” (fine) and “belos” (divine, arrow), referring to the digitiform valva of this species.

Distribution.

This species has only been found from Hachimori-cho (Honshu: Akita Pref).

Bionomics.

Larvae feed on the thalli of Conocephalum conicum . The locality is a forest path along a stream in the cool-temperate forests at 100-340 m.