Epicharmeropsis quadrivenulosus Huang, Sinitshenkova & Ren

Huang, Jiandong, Ren, Dong & Shih, Chungkun, 2007, New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China, Zootaxa 1629, pp. 39-50 : 42-47

Epicharmeropsis quadrivenulosus Huang, Sinitshenkova & Ren , sp. nov.

( Fig. 5–7 .)

Etymology. Latin prefix quadri- (four) and venulosus (veinlet)

Holotype. Male imago, No. CNU-E-YX-2007002 ( Fig. 5–6 .). Well preserved fore and hind wings as well as head and thorax, other parts of the specimen not preserved, the Late Jurassic to the Early Cretaceous, Yixian Formation, Jianshangou, Chaomidian Village, Shangyuan Township, Beipiao City, Liaoning Province, China.

Paratype. Male imago, No.CNU-E-YX-2007014 ( Fig. 7 .) from Yixian Formation (the Late Jurassic to the Early Cretaceous), Dakangpu Village, Liulongtai Township, Yixian County, Liaoning Province; male imago, No.CNU-E-YX-2007020 from Yixian Formation, Shimen Village, Yangshuling Township, Pingquan County, Hebei Province; male imago, No.CNU-E-YX-2007007 from Yixian Formation, Jianshangou, Chaomidian Village, Shangyuan Township, Beipiao City, Liaoning Province; male imago, No. CNU-E-YX- 2007008 from Yixian Formation, Huangbanjigou, Chaomidian Village, Shangyuan Township, Beipiao City, Liaoning Province, China.

Diagnosis. In addition to the diagnosis for the new genus, the species can be diagnosed as follows: CuA1 of forewing with 4 triads (loop-shaped veinlets) leading to wing margin.

Description. Male imago ( Fig. 5–7 .). CuA1 of fore wing with 4 loop-shaped veinlets leading to wing margin; left hind wing is not completely same with right hind wing, RSa of left hind wing branched and iRSa absent, however, RSa of right hind wing unforked and iRSa present. Other characters are similar to those of male E. hexavenulosus .

Female imago, male and female subimagoes, and nymph are unknown.

Comparison. E. quadrivenulosus sp. nov. can be distinguished from E. hexavenulosus sp. nov. by 4 triads (loop-shaped veinlets).

Measurements (mm). Holotype: forewing length 38.5, its width 15.5; hindwing length 21.0, its width 13.0; pronotum length 1.0; mesonotum 10.0. Paratype: male imago No.CNU-E-YX-2007014, body length 30.0 (excluding caudalii), forewing length 32.0, its width 13.0; male imago No.CNU-E-YX-2007011-1, forewing length 37.0, its width 15.5, hindwing length 17.0, its width 13.0.

Figures

FIGURE 5. Epicharmeropsis quadrivenulosus sp. nov., male imago, holotype CNU-E-YX- 2007002: A, photograph of part; B, forewing; C, left hind wing.

FIGURE 6. Epicharmeropsis quadrivenulosus sp. nov., male imago, holotype, CNU-E-YX- 2007002: A, photograph of head and thorax; B, photograph of cubital area on forewing. Without scale.

FIGURE 7. Epicharmeropsis quadrivenulosus sp. nov., male imago, paratype, CNU-E-YX- 2007014: A, photograph of part; B, body with wings.