Issikiomartyria hyperborea, 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 : 8-10

Issikiomartyria hyperborea sp. n. Figs 1c, 8, 9

Material examined.

Holotype: JAPAN [HONSHU] 1♂ emerged on 24.V.2012 from larva collected by T. Kato on 4.V.2012 at Tairadate (240m), Sotogahama-machi, Aomori Pref (Fig. 19:4), NMNS.

Paratype: JAPAN [HONSHU] 1♀ emerged on 24.V.2012 from larva collected by MK on 24.V.2012 at same locality, NMNS.

Additional materials: JAPAN [HONSHU] 1♀ emerged on 24.V.2014 from larva collected by YI on 10.V.2014 at same locality, KUHE.

Type locality.

Japan, Aomori Pref: Tairadate (Honshu).

Diagnosis.

Aedeagus with a pair of lateral triangular fins arising from ventral margin, extending horizontally. Female segment IX with a strong concavity extending from lateral to ventral sides.

Description.

Head dark brown, naked and glossy on both sides, sparsely covered with yellow piliform scales with dark yellow scales on vertex. Antenna slightly longer than forewing in male; densely covered with fuscous piliform scales on scape and pedicel. Labial palp 1-segmented. Forewing length 3.8 mm (n=1) and 3.9 mm (n=1) in male and female.

Male abdomen and genitalia (Fig. 8). Mid-dorsal length of segment IX ring about 1/4 of ventral length. Valva sharply tapered apically, with a tiny proximo-ventral ridge whose anterior portion fused with median plate. Aedeagus with a pair of short distal fins and a pair of longer, proximal fins extending vertically, arising from dorsal side; a pair of lateral triangular fins ventrally-oriented, extending horizontally. Tergum X with a small medial part; shorter than half of valva; with a pair of spines disto-dorsally.

Female abdomen and genitalia (Fig. 9). Segment IX ring strongly sclerotized, concave both at lateral and ventral sides; mid-dorsal length about 2/5 of ventral length. Dorsal plate between segment X sclerites large, well sclerotized, enlarged dorso-caudally. Corpus bursae large, globular, membranous, with signa composed of four tridenta-form sclerites near proximal end. Ductus spermathecae arising from a round concavity. Genital chamber with a small, triangular sclerite.

Remarks.

Issikiomartyria hyperborea sp. n. is distinguishable from the known Issikiomartyria species by the following characters. In the male, aedeagus with a pair of latero-basal fins arising from ventral side. In the female, segment IX with a deep concavity extending from lateral to ventral sides; dorsal sclerite of segment X convex vertically in the middle.

Etymology.

The specific name is an adjective in the nominative singular derived from the Greek word transliterated into Latin, “hyperboreus”, indicating the mythical people of Greek mythology who lived "Beyond the North Wind".

Distribution.

This species has only been found from Tsugaru peninsula of Japan (Fig. 14:1; Honshu: Aomori 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 approximately 250 m of Tsugaru peninsula, where Fagus crenata and Quercus crispula Blume ( Fagaceae ) dominate.