Daohugoucossus solutus, Wang, Bo, Zhang, Haichun & Fang, Yan, 2006

Wang, Bo, Zhang, Haichun & Fang, Yan, 2006, Gansucossus, a replacement name for Yumenia Hong, 1982 (Insecta, Hemiptera, Palaeontinidae), with description of a new genus, Zootaxa 1268, pp. 59-68 : 64-66

Daohugoucossus solutus sp. nov.

Figs 1 c, d, 3

Diagnosis. As for genus.

Description. Hind wing, part and counterpart, almost complete with anal area folded along PCu. The wing part posterior of PCu is tucked under so that the base of A1 crosses that of PCu. Length 30 mm, width 15 mm (length/width ratio 2.0).

Hind wing elongate, sharp apically, with dots in the veins. Nodal indentation about midwing. Costal area long, length/width ratio 5.6, maximal width in about basal 1/4. Sc arising basally, running close to R and coalesced with R at basal 0.25 wing length, and then branching from stem Sc+RA, obscure and terminating in costal margin just basal of indentation. R+M forking into R and M at wing base. R a little convex, lying alongside Sc until their fusion, and then branching into Sc+RA and RP. RA1 dividing from RA at the same level of indentation, ending in costal margin just distal of indentation. RA2 slightly convex, ending in costal margin. RP coalesced with M1 at basal 0.35 wing length, and terminating in apex of wing; RP +M1 length 5 mm. M1 departing from M at wing base, curved anteriorly, and straight for distal half. M2 straight, branching from M2+3+4; stem M as long as stem M2+3+4. Stem M3+ 4 in contact but not coalesced with CuA about basal 0.20 wing length, branching into M3 and M4 at the same level of indentation; stem M3+4 about as long as its branches; M3 and M4 straight. Arculus (basal m­cua crossvein) convex, strong and longitudinal. CuA arising basally from curved stem Cu (the CuA base is a weak concave oblique brace), curved anteriorly at junction with M3+4, and then forking into CuA1 and CuA2 at about basal 0.35 wing length; CuA1 and CuA2 nearly straight. Medial area very narrow. CuP slightly convex. PCu thin, straight. A1 thick and straight, terminating in anal margin. Marginal membrane clear and wider than vein width.

Etymology. Specific epithet is from the Latin solutus , separate, in reference to the division between M3+4 and CuA.

Holotype. NIGP 141370 and NIGP 141370a, part and counterpart. Deposited in the Nanjing Institute of Geology and Palaeontology ( NIGP), Chinese Academy of Sciences.

Age and occurrence. Middle Jurassic; Daohugou Village, Ningcheng County, Chifeng City, Inner Mongolia, China.

Remarks. The anal area is folded along PCu in the same way as in specimens of Gansucossus typicus , G. luanpingensis , and D. solutus , suggesting its feebleness, which probably resulted in the deformation or damage of this area in the taphonomic process.

Figures

FIGURE 1. a – b, Gansucossus typicus sp. nov., holotype; a, NIGP 141369 a, counterpart of NIGP 141369; b, NIGP 141369, part. c – d, Daohugoucossus solutus sp. nov., holotype; c, NIGP 141370 a, counterpart of NIGP 141370; d, NIGP 141370, part. All specimens are from the Middle Jurassic of Daohugou, Inner Mongolia, China. Scale bars represent 5 mm.