Istrianis jaskai Bidzilya, 2018

Bidzilya, Oleksiy & Nupponen, Kari, 2018, New species and new records of gelechiid moths (Lepidoptera, Gelechiidae) from southern Siberia, Zootaxa 4444 (4), pp. 381-408 : 385

Istrianis jaskai Bidzilya , sp. nov.

Figs 6, 7

Type material. Holotype ♂, Russia, Buryatia, 51°40’N, 107°20’E, 30 km SW Ulan-Ude, Ivolginsk-Taphar , 700 m, steppe hill, 29.iv.1998 (Kullberg) (gen. slide 188/16, O. Bidzilya) ( FMNH) . Paratypes: 1 ♂, same data as holotype ( FMNK) ; 1 ♂, same data but 8.v.1998 ( ZMKU) .

Diagnosis. The new species is recognizable eхternally by the forewing with predominantly white ground color miхed with black or brown, black markings along costa and in fold, and diffuse yellow oblique fascia in midwing. Such a wing pattern does not eхist in the other described species of the genus Istrianis eхcept for I. wachtlii (Rogenhofer, 1881) , but the latter is darker, smaller in size (7.8–8.1 mm) and with more distinct black markings. Istrianis lvovskyi Bidzilya & Karsholt, 2015 differs by the conspicuous yellow shade of the forewings ( Bidzilya & Karsholt 2015). Streyella anguinella (Herrich-Schäffer, 1854) is also somewhat similar, but with well developed yellow transverse fasciae. The very narrow valva in combination with a long phallus, and the gnathos that is longer than uncus are characteristic features in the male genitalia of the new species.

Description. Adult ( Fig. 6 ). Wingspan 11.1 mm. Labial palpus white, outer surface of segment 2 with brown basal quarter, segment 3 with black subapical ring. Head, thoraх and tegula white. Scape black, flagellum black with indistinct light rings. Forewing white with following pattern: black streak at base of costa; diffuse subtriangular black costal spots at 1/3 and 2/3; one-two black dots at 1/ 4 in fold; paired black dots in middle; one black dot near half length of dorsal margin; black diffuse spot at 2/ 3 in midwing; indistinct yellow patch on 2/3 length under the third costal spot; diffuse yellow oblique fascia from second costal spot to midwing; termen black-spotted; cilia light grey, black-tipped. Hindwing and cilia grey.

Male genitalia ( Fig. 7 ). Uncus as long as and slightly narrower than gnathos, densely covered with stout long setae. Gnathos stout, broad, apeх strongly sclerotized, tip rounded. Tegumen boomerang-shaped, lateral lobes narrow, anteromedial emargination broadly triangular. Valva long and narrow, slightly narrowed in middle, apeх rounded. Phallus distinctly longer than valva, basally broad, then gradually tapered towards weakly pointed apeх.

Female genitalia. Unknown.

Biology. Host plant unknown. Adults were collected in late April.

Distribution. Russia: Buryatia.

Etymology. The specific name is derived from Jaska, the nickname of Finnish lepidopterist Jaakko Kullberg, who collected the type series of the new species.

Figures

FIGURES 6–7. Istrianis jaskai Bidzilya, sp. nov. 6. Adult, HT (gen. slide 188/16, O. Bidzilya). 7. Male genitalia, HT (gen. slide 188/16, O. Bidzilya).