Leptolingia oblonga, Khramov, Alexander V., 2012

Khramov, Alexander V., 2012, The new fossil lacewings of Grammolingiidae (Neuroptera) from the Jurassic of Central Asia and Mongolia, with notes on biogeography of the family, Zootaxa 3478, pp. 297-308 : 303

Leptolingia oblonga sp. nov.

Description. Forewing ( Fig. 6 ). Length 51 mm, width 16,5 mm. Dense crossveins are present at entire wing. Costal area with two rows of cells basally and distally, except the middle of wing, which is narrower and contains only one row of cells. Trichosors not discernible, possibly because of insufficient preservation of the specimen. Sc distally separated from R1. Branches of Rs forked closer to margin of wing. First branch of Rs separates from Rs after bifurcation of CuP. CuP apparently simple and once dichotomously branched. Two rows of cells between A1 and A2 near wing base.

Type material. Holotype PIN № 3688/1072, an incomplete forewing. Mongolia: Dundgovi Aimag (Middle Gobi Province), Bayanjargalan Sum (district), Houtiyn-Hotgor locality; Upper Jurassic.

Etymology. From the Latin word oblongus, -a, meaning “elongated”.

Comments. The species should be assigned to the genus Leptolingia , since CuA is forked after the fork of CuP and A1 terminates on the posterior margin before separation of the first branch of Rs. Five species of genus Leptolingia were described: L. jurassica Ren, 2002 , L. tianyiensis Ren, 2002 , L. shartegica Khramov, 2010 , L. calonervis and L. imminuta Liu et al., 2011 . These species may be divided into two groups according to the structure of the forewing costal area: those that have two rows of cells along of all length of the costal area ( L. jurassica , L. shartegica and L. calonervis ) and those that have only one row of cells in the middle of the length of the costal area ( L. imminuta and L. tianyiensis ). L. oblonga is assigned to the second group and differs from its species by the greater size (forewing length is 51 mm in L. oblonga , 41 and 30 mm in L. tianyiensis and L. imminuta respectively). L. oblonga is very similar to L. tianyiensis . So, the area between A1 and A2 at the base of the forewings of L. oblonga and L. tianyiensis contains two rows of cells and is narrower, than this area of other Grammolingiidae , which contain 3 or 4 rows of cells. L. oblonga differs from L. tianyiensis by the longer A1.

Figures

FIGURE 6. Leptolingia oblonga sp. nov., Houtiyn-Hotgor locality, Mongolia, Upper Jurassic. (A) The photograph of the forewing, holotype, PIN № 3688 / 1072. (B) The drawing of the holotype, PIN № 3688 / 1072. Scale bar represents 5 mm.