Quadraticossus longicaulis, Ying, Wang & Dong, Ren, 2007

Ying, Wang & Dong, Ren, 2007, Two new genera of fossil palaeontinids from the Middle Jurassic in Daohugou, Inner Mongolia, China (Hemiptera, Palaeontinidae), Zootaxa 1390, pp. 41-49 : 43-46

Quadraticossus longicaulis sp. nov.

( Fig. 2A–B )

Diagnosis: Sc with weak branches, terminating on R1 near the middle of forewing. The stem of M is long and M bifurcated into M1+2 and M3+4 at the same level of Sc fusing with R1.Crossvein m­cua near point of Sc arising from Sc+R1.

Description: Forewing triangular with distinct CP and nodal line. Sc with weak branches, separated from R at base, fused with R at the level of M bifurcation into M1+2 and M3+4, extending at indentation and terminating on R1. M branched into M1+2 and M3+4 little after point of R bifurcation into R1 and Rs. M1+2 and M3+4 separated at same level. Crossvein r­m near point of M1+2 branching into M1 and M2. CuA curved joined with M by a crossvein m­cua and also connected with M4 by long horizontal crossvein. Nodal line traceable as indentation across point of Sc arising from Sc+R1, along with R1 for a short distance, then across Rs to M1+2, along with latter to separating point of M, separating discal cells. Forewing with prominent color pattern consisting of hyaline patches on a dark ground. ( Fig.2. A, B ).

Forewing (preserved part) 40 mm long, 19 mm wide.

Etymology: Specific epithet is a combination of Latin prefix longi­ (long) and ­caulis (stem), referring to the long stem of forewing vein M.

Material: The new species is known from a single forewing. Holotype: A single forewing, with anal area missing, No.: CNU­H­NN2006094.

Horizon and locality: Jiulongshan Formation, Middle Jurassic, Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China.

Remarks: This species is similar to Q. fangi sp. nov, but can be differentiated from the latter in the following features on the forewing: Sc with weak branches, terminating on R1 near the middle of wing; M bifurcated into M1+2 and M3+4 at the same level of Sc fusing with R1; crossvein r­m near the point of M1+2 branching into M1 and M2; m4­cua is shorter than the latter.

This new species is erected based on a single incomplete forewing, but we anticipate discovery of more well­preserved specimens that will allow us to restudy this species in detail.

Figures

FIGURE 2. A, B, Quadraticossus longicaulis gen. & sp. nov., holotype: A, photograph of part CNU­H­NN 2006094; B, line drawing.