Jurataenionema stigmaeus 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 : 3-4

Jurataenionema stigmaeus Liu and Ren , sp. nov.

Figs. 3–5

Etymology. From Latin stigmaeus , refers to the presence of a fuscous stigma in the terminal space of forewings.

Materials. Holotype, female. CNU, NMDHG 183, a well–preserved body with part of wings, and paratypes (Imagoes) from the same locality: CNU, NMDHG 99, and CNU, NMDHG 184–187.

Description. Length of body 14 mm, to tip of wings 18 mm. Head large, triangular, the posterior part not twice as wide as the anterior; antennae long. Prothorax narrow, two–thirds of the mesothorax; mesothorax and metathorax developed, same width. Legs robust.

Forewings 15 mm length. Sc connected to R at almost two–thirds total wing length; c–r far from the Sc tip, grey pterostigma present; Rs forks distinctly after the r–rs, and its anterior branch forks again close to the Rs forks. Crossvein r–rs short, almost perpendicular to Rs. M appears 2–branched, forking from the proximal 1/3 of the wing, its branches are nearly twice as long as Rs branches, rs–m straight, connects Rs before r–rs and terminates at the one fifth of MA. Crossvein m–cua S–shaped, connecting M stem or MP, and terminated the stem of CuA. CuA forks close to M forks, with long anterior branch. 4 crossveins at the median area, 7 crossveins at the cubital areas.

Abdomen with 10 visible segments, almost 1.7 times as long as thorax. Ninth sternite produced as a subgenital plate, the median tongue upturned, triangular. Cerci short, eight or nine segments.

Remarks. The new species J. stigmaeus differs from the type species by the defined pterostigma.

Figures

FIGURES 3, 4. Jurataenionema stigmaeus gen. et sp. nov. Holotype, CNU, NMDHG 183. Scale bar represents 2 mm, dorsal view.

FIGURES 5. Jurataenionema stigmaeus gen. et sp. nov. Paratype, CNU, NMDHG 99, ventral view. Scale bar represents 2 mm.