Cathayiblatta longata, Li, Zhu, Hong, Youchong & Yang, Ding, 2007

Li, Zhu, Hong, Youchong & Yang, Ding, 2007, A new Middle Triassic genus and species of Mylacridae (Blattodea) from China, Zootaxa 1660, pp. 53-59 : 56-57

Cathayiblatta longata sp. nov.

( Figs. 3–6 )

Description. Wing length 23.0 mm, wing width 8.0 mm.

Forewing narrowing toward tip, lance-like. Wing ( Fig.3 , 4) 2.75 times longer than wide. Costal margin rather flat with weak arch, wing hind margin distinctly curved. Humeral small, occupying 0.15 of wing length, ScA around 0.43 of wing length, slightly shorter than wing, with at least 3 branches, ScP with 6 branches: ScP1–ScP6, ScP1 and ScP4 forked, others not branched. R stem divided into RA and RP, RA stem distinctly longer than that of RP; two-branched RA, RP stem rather short, around 1/7 of RA stem, six-branched and 2–3 times branched except the fourth branch. R branched first, CuA second, M last. This makes M with the longest stem, CuA with secondary one and R with shortest one. Base of M arched, divided into MA and MP, MA 5.5 times longer than MP, oblique up to middle of wing apex; three-branched MA, the second branch forked; MP stem rather short, divided into 5 branches. MP with few branches, occupying lower part of wing margin; there is 1 curved arculus between MP and CuA, near the base of MP. Cu very short, divided into CuA and CuP, CuA also divided into CuAa and CuAb, CuAa and CuAb respectively divided into 4 branches; M and all the branches of CuAa and CuAb oblique up to wing margin. CuP obviously arched. Anal area shuttle-like, around 0.36 of wing length, divided into anterior and posterior branches: AA and AP; AA three-branched, basally sclerotized; AP eight-branched: AP1 and AP8 with 9 to 10 veins, AP2 and AP6 with secondary branches. Decoration ( Figs. 5–6 ) between veins mainly lateral-cut, located in Sc and R areas. Cu–A area, especially CuA stem–CuP–AA–AP1–AP3 with big net vein.

Holotype: One complete and well-preserved forewing (part and counterpart) except for some margin broken. The broken parts do not affect the character of the wing venation. The holotype ( BNHM –TH06–1–002) was deposited in Beijing Museum of Natural History ( BNHM), Beijing, China.

Locality and horizon: Hejiafang Village, Tongchuan City, Shaanxi Province, China; Tongchuan Formation, Middle Triassic.

Etymology. The specific name refers to the shape of the wing.

Figures

FIGURE 3. Cathayiblatta longata gen. et sp. nov., wing photograph.

FIGURE 5. The ultrastructure of wing, showing the decoration between veins (400 times).

FIGURE 6. The ultrastructure of wing, showing the decoration between veins (800 times).