Jurataenionema inornatus Liu and Ren

Liu, Yushuang, Sinitshenkova, Dong Ren Nina D. & Shih, Chung Kun, 2007, The oldest known record of Taeniopterygidae in the Middle Jurassic of Daohugou, Inner Mongolia, China (Insecta: Plecoptera), Zootaxa 1521, pp. 1-8 : 2-3

Jurataenionema inornatus Liu and Ren , sp. nov.

Figs. 1–2

Etymology. From Latin inornatus , means the wing luculent, without any stigma in the terminal space of forewings.

Materials. Holotype, female. CNU, NMDHG 61, a well–preserved body with part of wings, and a paratype (imago) from the same locality: CNU, NMDHG 145.

Description. Length of body 11–13 mm, to tip of wings 16–17 mm. Head large, almost triangle, the basal part is 1.5X as wide as the distal; antenna long, longer than body. Cervix preserved clearly, narrow. Prothorax transverse, two–thirds of mesothorax length.

Forewings: 14–15 mm length. Costal area without additional veinlets, Sc terminates R nearly to two– thirds of the total wing length, c–r far from the Sc tip. Rs departs from R at one–sixth of the base, and forks distinctly after r–rs, its anterior branch forks again at the midlength. r–rs short, almost vertical to Rs, M bifurcates slightly basal of the midlength of wing, and its branches are nearly twice as long as Rs branches, rs–m straight, connects with Rs before r–rs and terminates at the one fifth of MA. Crossvein m–cua S–shaped, connecting M at the same level of M forks, and terminated the stem of CuA. Vein CuA forks basal to M forks, its anterior branch long, almost twice as long as the posterior branch, 5–8 crossveins at the median and cubital areas.

Abdomen with 10 visible segments, slightly longer than head and thorax together. Ninth sternite produced, the median tongue upturned, narrowly round, tenth tergite transversely wide, sclerotized. Cerci short, its segments faint, about 8–10 segments.

Legs long, coxa and trochanter wide, femur robust, nearly twice as wide as tibia, tibia slender, about 1.3X as long as femur, tarsus long, half a length of tibia, three segments are of almost the same length.

Remarks. The new species J. inornatus resembles extant Mesyatsia thianshanica ( Zhiltzova 1972) in venation, except Rs has three branches and there is no costal crossvein. In addition, no pterostigma exists, while it is present in M. thianshanica .

Figures

FIGURES 1, 2. Jurataenionema inornatus gen. et sp. nov. Holotype, CNU, NMDHG 61. Scale bar represents 2 mm, ventral view.