New species and material of Hagloidea (Insecta, Ensifera) from the Yanliao biota of China Author Gu, Jun-Jie https://orcid.org/0000-0003-1931-4424 College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China orthoptera_gu@aliyun.com Author Yang, Xin College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China Author Huang, Rong College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China Author Yang, Guijun School of Life Sciences, Ningxia University, Yinchuan, 750021, China Author Yue, Yanli College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China Author Ren, Dong College of Life Sciences, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing, 100048, China text ZooKeys 2021 2021-04-22 1033 183 190 http://dx.doi.org/10.3897/zookeys.1033.63571 journal article http://dx.doi.org/10.3897/zookeys.1033.63571 1313-2970-1033-183 EB0B136D33034F7F80D19C08EA4E252E C55290FDE54056258B5A3F84FB541295 Archaboilus polyneurus sp. nov. Gu, Yue & Ren Fig. 1 Diagnosis. ScA reaches anterior wing margin at level of divergence of M+ CuA, RP branched distally, lengths of free CuA and free M equal, CuA + CuPaα with numerous branches. Material examined. Holotype , CNU-ORT-NN2009018PC. Paratype , CNU-ORT-NN2009011. Locality and age. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, Bathonian-Callovian boundary interval ( Ren et al. 2019 ), Middle Jurassic. Description. Forewing oval, estimated length ca 33 mm. ScA crossing area between ScP and anterior wing margin, reaching margin at level of divergence of M+ CuA; basal part of ScP slightly anteriorly curved, ScP reaching anterior margin at 3/4 to wing base with numerous oblique branches uniformly distributed; branches of ScP with secondary vein between them, formed by two rows of cells; most cross-veins between ScP and R straight; stem R slightly undulate; RA basally branched, pectinate with 4-7 terminal branches; base of RP curved towards to posterior margin, RP very distally branched with less branches than RA; area between RA and RP with series of regular arranged cross-veins; area between R and M expanding when R dichotomous, with series of long cross-veins, cross-veins of expanded area curved; presence of a transverse veinlet connecting MA and base of RP (asterisk on Fig. 1B, D, F ); M separated from M + CuA distant to origin of RP; MA probably undulate; MP strongly curved basally (not preserved in holotype); lengths of free CuA and free M equal; CuA + CuPaα with numerous branches; CuPaβ oblique; "handle" straight; CuPb strongly oblique, basal part and middle part (where bearing teeth) forms obtuse angle. Figure 1. Photos and drawings of Archaboilus polyneurus sp. nov. Gu, Yue & Ren, asterisk indicates the transverse veinlet connecting MA and base of RP. A-D right and left forewing of the holotype, CNU-ORT-NN2009018C E, F CNU-ORT-NN2009011. Scale bar: 5 mm. Etymology. From the Latin " polyneurus ", referring to its numerous branches of CuA + CuPaα . Discussion. Although the preservation and deformation of the specimens makes it difficult to identify the complete structure of ScA, this new species can be assigned to Archaboilus Martynov, 1937 by a combination of its ScA crossing the area between ScP and the anterior wing margin, the base of MP strongly curved, and the presence of a transverse veinlet connecting MA and the base of RP. Besides these diagnostic characters of the genus, A. polyneurus sp. nov. shares with A. musicus from the same locality a slightly sigmoidal ScP, but it differs from it by its much more distally branched RP and distinctly smaller forewing. Although the holotype and single known specimen of A. kisylkiensis Martynov, 1937 is only the basal half of a forewing, its free CuA is much longer than its free M, not as in the new species. A. polyneurus sp. nov. differs from all other Archaboilus species by its shorter ScA, very distally branches of RP, and numerous branches of CuA + CuPaα . Although the terminals numbers of RA and CuA + CuPaα are different between the holotype and paratype, this kind of difference has been shown to be intra-specific variation in orthopterans and their relatives ( Bethoux 2008 ; Gu et al. 2010 , 2011 ).