Parahemeroscopus jiuquanensis Qi & Zheng, 2024

Qi, Pengliang, Liu, Peihan, Xiao, Chuantao & Zheng, Daran, 2024, A new hemeroscopid dragonfly (Odonata, Anisoptera) from the Lower Cretaceous of the Jiuquan Basin, northwestern China, Zootaxa 5432 (4), pp. 567-572 : 568-569

Parahemeroscopus jiuquanensis Qi & Zheng , sp. nov.

( urn:lsid:zoobank.org:pub:0EAA1587-CF7E-4BD9-BFC6-31CEC57B048D )

Fig. 1

Etymology. Named after Jiuquan, the locality yields the new dragonfly.

Holotype. NIGP203629, part and counterpart of a complete male hindwing, deposited in NIGPAS.

Locality and horizon. Hanxiagou outcrop, Jiuquan City, Gansu Province, northwestern China; upper Zhonggou Formation, Lower Cretaceous (lower Albian).

Diagnosis. As for genus, by monotypy.

Description. Specimen NIGP203629 ( Fig. 2 ). Male hindwing in having anal triangle. Wing length 26.0 mm, width at the level of nodus 8.4 mm; distance from wing base to nodus 11.9 mm, and from nodus to pterostigma 8.9 mm. Pterostigmal length 2.8 mm and maximum width 0.5 mm, with basal side less oblique than distal side, covering three cells. Primary antenodal crossveins Ax0, Ax1 and Ax2 well defined; Ax1 0.6 mm basal of arculus, Ax2 3.9 mm distal of Ax1 and almost at level of distal end of discoidal triangle. One antenodal crossveins present between Ax1 and Ax 2 in first row; three antenodal crossveins present in first row and distal of Ax2; ten postnodal and seven postsubnodal crossveins present. IR1 zigzagged and long, originating six cells distal of N. RP1 and RP2 with one row of cells between them basally and divergent below Pt, with seven rows of cells along wing margin. Base of RP2 aligned with subnodus. Only one oblique crossvein ‘O’ between RP2 and IR2, lying 0.5 mm and 4 cells distal of subnodus. Area between RP2 and IR2 widened distally with 4 rows of cells along wing margin. Midfork 4.3 mm basal of subnodus, and IR2 base 1.6 mm distal of midfork. Rspl and Mspl not present. Area between RP3/4 and MA narrow, mostly with one row of cells in between, and two cells along wing margin. Postdiscoidal area with two rows of cells basally, expanded distally with ten cells along wing margin. Area between MP and CuAa narrow basally, with one row of cells until level of IR2 base, expanded distally with four rows of cells near posterior wing margin. MP gently curved, reaching posterior wing margin slightly distal level of subnodus. CuAa well defined with three posterior branches; five rows of cells between CuAa and posterior wing margin. Discoidal triangle wide and not divided by crossveins, with length of anterior side 2.3 mm and basal side 1.4 mm. Hypertriangle free, length 3.1 mm and maximum width 0.6 mm. Subdiscoidal triangle unicellular, length 1.1 mm and maximum width 0.7 mm. CuP-crossing 1.1 mm basal of arculus. ‘Gaff’ straight and elongated. CuAb and posterior branch of AA enclosing relatively wide anal loop; anal loop divided into nine cells, with maximum length 3.9 mm and maximum width 2.7 mm.

Figures

FIGURE 1. Parahemeroscopus jiuquanensis gen. et sp. nov., holotype (NIGP203629), photographs of male hindwing, part (A) and counterpart (B). Scale bar = 5 mm.

FIGURE 2. Parahemeroscopus jiuquanensis gen. et sp. nov., holotype (NIGP203629), line drawing based on two parts. Scale bar = 5 mm.