Mongolbittacus oligophlebius, Liu, Sulin, Shih, Chungkun & Ren, Dong, 2014

Liu, Sulin, Shih, Chungkun & Ren, Dong, 2014, Four new species of hangingflies (Insecta, Mecoptera, Bittacidae) from the Middle Jurassic of northeastern China, ZooKeys 466, pp. 77-94 : 81-83

Taxon classification Animalia Mecoptera Bittacidae

Mongolbittacus oligophlebius sp. n. Figs 5, 6

Etymology.

The specific name oligophlebius denotes the wing venation is simple with only a few crossveins.

Holotype.

CNU-MEC-NN-2013009 P/C, part and counterpart. Forewing 12 mm long with a maximal width of 3.5 mm.

Paratype.

CNU-MEC-NN-2013014.

Horizon and locality.

Jiulongshan Formation, late Middle Jurassic, Daohugou Village, Ningcheng County, Inner Mongolia, China.

Diagnosis.

The posterior part of the "bittacid cross’ coinciding with the forking of M3+4; one oblique crossvein between R2+3 and R4 at the bifurcation of R2+3; and length of R3 0.9 times as long as R2+3.

Description.

Poorly preserved with only one complete forewing and the basal part of one hind wing. But the mid-tibia with two long spurs and five tarsomeres well-preserved, covered by dense short setae (Fig. 5A, B, D).

Forewing. Sc reaching the anterior margin proximad of the forking of Rs, one crossvein between C and R1; one subcostal crossvein (Scv) between Sc and R1; Rs bifurcating into four branches, one crossvein between R1 and R2+3 and one oblique crossvein between R2+3 and R4; Rs arising from R1 at an acute angle; length of R3 0.9 times as long as R2+3; one crossvein between R4 and R5; M with four branches and bifurcating proximad of the forking of Rs; the 'bittacid cross’ not aligned; the posterior part of the 'bittacid cross’ coinciding with the forking of M3+4; one crossvein between R5 and M1, one between M1 and M2 and one between M2 and M3; one crossvein between Cu1 and M4, Cu1 and Cu2 parallel with two crossveins between them; one crossvein between Cu2 and 1A; 1A reaching the posterior margin distad of the origination of Rs from R1; 2A bending sharply and reaching the posterior margin, a short crossvein between 1A and 2A (Figs 5C, E, 6C).

Remarks.

Mongolbittacus oligophlebius sp. n. (Figs 5, 6) is assigned to the genus Mongolbittacus based on the following generic diagnostic characters: R4+5 plus R4 distinctively curved; M4 simple; the 'bittacid cross’ not aligned; posterior anal field broad; and 2A bending sharply and reaching the posterior margin. This new species is differentiated from Mongolbittacus daohugoensis and Mongolbittacus speciosus sp. n. by characters as shown in the key below.