Ilimpeika humerosa Shcherbakov, 2022

Shcherbakov, D. E., 2022, New genus of Ignotalidae (Cicadomorpha) with notes on other Homoptera from the Permian and Triassic of the Tunguska Basin, Russian Entomological Journal 31 (3), pp. 230-233 : 231

Ilimpeika humerosa Shcherbakov , sp.n.

Figs 1–4

MATERIAL. Holotype PIN 2099/2, incomplete right tegmen (clavus missing) on reddish burnt carbonaceous siltstone; paratype PIN 2099/1, left hind wing (anal area missing) on orange burnt siltstone; Krasnoyarsk Krai, Evenkiysky District, right bank of the Ilimpeya River 3.3 km downstream of the Ukshun(n)ukan River, collected by N.I. Emelyanov (All-Union Aerogeological Trust) in 1962; locality Ilimpeya, or Red Cliff (Красный утёс) [ Meyen, 1966], or Ukshunukan-2 (outcrop 716 of G.N.Sadovnikov); 62.25°N, 105.29°E; Degali Formation [ Meyen, 1966], Upper Permian.

DESCRIPTION. Tegmen 47 mm long and 19 mm wide as preserved (estimated full length ca. 60 mm), elongate. Prenodal Sc branches weak, not branched profusely and not turned longitudinal towards wing margin. RA apparently with at least 4 branches, RP with about 6, M and CuA with about 10 branches each. Distinct crossveins only in postnodal part (except for one nodal r-m), numerous, slightly inclined distally, more close-set in CuA area. Hind wing 35 mm long and 22 mm wide as preserved, much shorter than tegmen. Costal margin strongly arched at base, with about ten strong coupling hooks. R stem short and oblique, RA with 3 main branches, RP with 6 branches, M with 3 or 4, CuA with bundle of at least 13 branches. Colour pattern on wings not preserved.

REMARKS. The locality was listed among those with the Korvunchana flora of possible Early Triassic age (and the formation was mentioned as the Limptekon Formation) [ Shcherbakov, 2000; Ponomarenko, Shcherbakov, 2004; Ponomarenko, 2006], but in fact it is rich in cordaites, belongs to the Degali Formation s.str. (lower subformation of the former Degali Formation s.l.) and is undoubtedly Late Permian [ Meyen, 1966].

ETYMOLOGY. From Latin humerus (shoulder).

4

Figures

Figs 1–4. Ilimpeika humerosa gen. et sp.n.: 1–2 — holotype tegmen: 1 — photograph (mirrored); 2 — venation (dash-dotted, boundary of precostal area); 3–4 — paratype hind wing: 3 — photograph (mirrored); 4 — venation. Scale bars: 10 mm. Рис. 1–4. Ilimpeika humerosa gen. et sp.n.: 1–2 — голотип, переднее крыло: 1 — фото (отражено Зеркально); 2 — жилкование (Штрих-пунктиром граница прекостального полЯ); 3–4 — паратип, Заднее крыло: 3 — фото (отражено Зеркально); 4 — жилкование. МасШтаб: 10 мм.