Isoceras shevnini Yakovlev

Yakovlev, Roman V., 2015, A new species of Isoceras Turati, 1924 (Lepidoptera: Cossidae) from Armenia, Zootaxa 3990 (1), pp. 147-150 : 148

Isoceras shevnini Yakovlev sp. nov.

( Figs 1−4 )

Type material. Holotype: male, Republic Armenia, Aiotzdzorsky Range, Yeghegnadzor suburbs, 150 km SE Yerevan, 2000 m, mountain steppes, July 2−7 2009, leg. Yuriy Shevnin (MWM); paratypes: 1 male, same locality and data (RYB); 1 male, Armenia, Jerewan District, Umgebung von Hyphyo, 07.05.1995, leg. A. Bergmann (RYB); 1 male, 1 female, Armenia, mts Daralagez, pag. Sultanber, 9.07.1937, leg. M. Rjabov ( ZMKU).

Diagnosis. The new species is close to I. bipunctata but differs by the following characters:

- absence of dark spots on wings upperside

- presence of zone of dark hairs on hindwing anal angle from upperside

- presence of dark zone on forewing underside costal edge

- smoothed semicircular ridge on costal edge of valva (more developed ridge with pointed tip in I. bipunctata ) - longer aedeagus curved in proximal third (aedeagus somewhat shorter and smoothly curved in mesial third in I.

bipunctata )

- pointed tips of transtilla processes.

Description. Male. Forewing length 13–15 mm, wingspan 31–33 mm. Antenna bipectinate, processes of antenna short. Thorax and abdomen densely covered by pale yellow hairs. Forewing pale yellow, brighter on costal edge, without pattern. Underside of forewing with intense dark coal suffusion in costal region. Fringe pale yellow, monochrome. Hindwing pale yellow, lighter than forewing, with more or less developed zone of dark hairs on anal edge of wing, fringe pale yellow, monochrome.

Female with long ovipositor. Forewing length 15 mm, wingspan 33 mm. Externally resembles male but differs by dark brown hindwing with dark monochrome fringe.

Male genitalia. Uncus broad with smoothly rounded apex, branches of gnathos thin, of moderate length, gnathos small, weakly sclerotized; valva lanceolate with weak sclerotization in distal third, with poorly developed semicircular process in mesial third of costal edge; processes of transtilla very short, with thick base, abruptly converged at apex, hook-like; juxta small with broad leaf-like lateral processes separated aside; saccus semicircular, large; aedeagus very thin, slightly shorter than valva, weakly curved in proximal third, pore of vesica has dorso-apical position and equals about 1/3 of aedeagus length, vesica without cornuti.

Female genitalia not investigated.

Habitat. The territory of the Aiotzdzorsky range is dominated by mountain-steppe and mountain-meadow landscapes.

Etymology. The new species is named after a Russian lepidopterist Yury Shevnin (Ekaterinburg).

Figures

FIGURES 1 − 8. 1. Isoceras shevnini Yakovlev, sp. nov., holotype, male (upperside). 2. I. shevnini Yakovlev, sp. nov., holotype, male (underside). 3. I. shevnini Yakovlev, sp. nov., paratype, female (upperside). 4. I. bipunctata (Staudinger, 1887), male, Kleinasien, Hakkari prov., Tanin Tanin pass, 2000 − 2300 m, 12 - 13.07.1983, leg. de Freina (MWM). 5. I. bipunctata (Staudinger, 1887), female, Kleinasien, Hakkari prov., Tanin Tanin pass, 2000 − 2300 m, 3 − 5.07.1983, leg. W. Thomas (MWM). 6. Genitalia of the holotype of I. shevnini Yakovlev, sp. nov. 7. Genitalia of the male of I. bipunctata (Staudinger, 1887), Iran, Fars. 8. Type locality of I. shevnini Yakovlev, sp. nov. (photo by Yu. Shevnin).