Scythris dividua (Meyrick, 1916), genus combination, 2022

Nupponen 1, Kari & Sihvonen, Pasi, 2022, Revision of Neotropical Scythrididae moths and descriptions of 22 new species from Argentina, Chile, and Peru (Lepidoptera, Gelechioidea), ZooKeys 1087, pp. 19-104 : 19

Scythris dividua (Meyrick, 1916), genus combination incertae sedis

Figs 32 , 60

Scythris dividua Meyrick, 1916. Exotic Microlepidoptera, vol. 2 (part 1): 12.

Material examined.

Lectotype. Peru • ♂: Oroya ; [11°31'S, 75°53'W]; 12200 feet a.s.l.; 7.14.; Parish leg.; [genitalia slide] JFGC No. 8054; NHMUK ID 010922357; NHMUK slide ID 010316666; coll. NHMUK.

Paralectotypes. Peru • 11 exx.; same data as for lectotype; coll. NHMUK .

Diagnosis.

Scythris dividua , S. medullata , and S. notorrhoa are similar externally. Reliable determination can be achieved by genitalia examination (DNA barcodes not available for all these three taxa yet). Uncus pentagonal, heavily sclerotised in Scythris dividua ; rectangular, small, less sclerotised in Scythris medullata ; oval and heavily sclerotised in Scythris notorrhoa . Valvae narrow basally, inner margin without sclerotisations in Scythris dividua ; broad basally, inner margin with minute sclerotisation in Scythris medullata ; asymmetrical, inner margin with large sclerotisations in Scythris notorrhoa . Segment VIII distinct in each three species, see illustrations.

Description.

The original description is quoted: "Wingspan 12--15 mm ♂, ♀. Head, palpi and thorax dark bronzy-grey, somewhat sprinkled with whitish. Antennal ciliations of ♂ 1. Abdomen dark grey, in ♂ sprinkled with whitish beneath, in ♀ suffused with ochreous-whitish beneath and towards apex above. Forewings lanceolate; dark bronzy-grey, irregularly strewn with whitish scales, especially posteriorly; a cloudy white median streak from base to near termen, and a slenderer one close beneath it to beyond middle; an undefined subdorsal streak of obscure whitish irroration from base to tornus: cilia grey, mixed with white towards base. Hindwings 0.75, 4 and 5 separate; dark grey, thinly scaled anteriorly; cilia grey."

Male genitalia. Uncus pentagonal, heavily sclerotised plate. Tegumen trapezoid hood; anteriorly attached to broad transverse sclerotisation having anteriorly a rectangular extension with heavily sclerotised blunt tip. Phallus short and thick, basally more sclerotised (homology interpretation tentative, this structure could also be gnathos base). Valva short, basal rather narrow, distally broad and round. Saccus labiate, longer than valva. Sternum VIII large asymmetrical plate; basal portion rectangular with anterior apodemes, arched sclerotisation medially; posteriorly two large bifurcate processes, outer lobes distally asymmetrically extended, inner lobes with three stout apical spikes. Tergum VIII H-shaped; posterior shanks bent inwards, apices with five stout spiniform setae and bunch of thick setae; tip of anterior shanks foot-shaped.

Female genitalia. Not dissected.

Distribution.

Peru.

Figures

Figures 30 - 34. Scythrididae adults, genus Scythris 30 S. andensis Nupponen sp. nov., genus combination incertae sedis, male, holotype 31 S. mendozaensis Nupponen sp. nov., genus combination incertae sedis, female, holotype 32 S. dividua Meyrick, 1916, genus combination incertae sedis, male, lectotype 33 A S. medullata Meyrick, genus combination incertae sedis, 1916, male, lectotype 33 B S. medullata Meyrick, 1916, genus combination incertae sedis, male 34 S. notorrhoa Meyrick, 1921, genus combination incertae sedis, male, lectotype.

Figures 59 - 60. Male genitalia of Scythris 59 S. andensis Nupponen sp. nov., genus combination incertae sedis, holotype, slide 2 / 15 Dec. 2019 KN (genitalia shown in lateral view) 60 S. dividua Meyrick, 1916, genus combination incertae sedis, lectotype, slide JFGC No. 8054.