Prolyda dimidia, Wang, Chen, Shih, Chungkun, Rasnitsyn, Alexandr P. & Wang, Mei, 2016

Wang, Chen, Shih, Chungkun, Rasnitsyn, Alexandr P. & Wang, Mei, 2016, Two new species of Prolyda from the Middle Jurassic of China (Hymenoptera, Pamphilioidea), ZooKeys 569, pp. 71-80 : 72-73

Taxon classification Animalia Hymenoptera Xyelydidae

Prolyda dimidia sp. n. Figs 1, 2

Diagnosis.

In addition to generic diagnosis, SC1 longer than SC2; SC2 relatively long, almost equal to 1-RS in length; 1-M short, about twice as long as 1-RS, and 0.6 times as long as RS+M; 2r-m slightly postfurcal; 1r-rs vertical, slightly shorter than 2r-rs and parallel to it; 3r-m located well distal to middle of cell 3r, separated from apex of cell 3r by almost its own length; 2m-cu at middle of cell 3rm.

Measurements

(in mm). Body length (excluding antenna) 11.4, head length including mandible 2.03, width 2.48, forewing length up to the end of cell 3r 8.92, hind wing length up to the end of cell r 6.58.

Description.

Color not reliably known because of absence of counterpart (Fig. 1A). As preserved, body and legs moderately pale except for tibiae and tarsi dark; forewing somewhat infuscated subbasally, particularly so in costal area along veins, pterostigma slightly infuscate.

Head circular and large (Fig. 1C), and nearly 1.38 times as wide as mesothorax; clypeus distal margin straight; mandibles incompletely preserved. Propleura large and rectangular, structure of meso- and metathorax unknown except for mesopseudosternum triangular, far from anterior margin of ventropleuron.

Three pairs of legs preserved (Fig. 1B); coxae trapezoid, and hind coxae elongate; femora short and fusiform, fore femur slightly thicker than tibia, approximately 3 times as long as wide, covered with dense bristles; tibia short and narrow, mid tibia about 1.4 times as long as mid femur; tarsi incompletely preserved, fore tarsi with 1st, 2nd and 5th segment elongate, 3rd and 4th subtriangular, with length of fore tarsal segments 1:2:3:4:5 = 3.98: 1.57: 1.18: 1: 1.46, hind tarsal segments 1: 2: 3: 4 = 4.16: 1.69: 1.35: 1.

Forewing (Fig. 2A) with pterostigma sclerotized around margins (Fig. 1D), posterior part thicker than anterior; SC with two branches, anterior branch merging with C at origin of 1-RS, posterior branch long and oblique, slightly longer than 1-RS; R curved proximal to RS base; 1-RS almost vertical, about half of 1-M; cross vein 1r-rs vertical, 0.6 times as long as 2r-rs and parallel to it; 2r-m almost interstitial, located distal to middle of cell 2mcu; 3r-m separated from the apex of cell 3r by almost its own length; M+Cu curved; RS+M vertical to 1-M, 1.8 times as long as 1-M, and nearly of same as 1-Cu; 2-Cu curved upwards, almost as long as 2-M; 1m-cu 0.43 times and 0.25 times as long as 2-Cu and 3-Cu, respectively; 1cu-a bent distinctly towards wing apex, equal to length of 2-Cu, slightly distal to middle of cell 1mcu; 2m-cu curved nearly at its mid length, located at middle of cell 3rm; cell 1mcu 1.8 times as long as wide, 0.6 times as long as cell 2rm; cell 2rm nearly as long as cell 3rm, and cell 3r 1.7 times as long as cell 2r.

Hind wing (Fig. 2B) SC absent; cell r tapering apically; 1-RS about as long as 1-M; cross vein 1r-m far from bases of both RS and M; 3r-m oblique towards wing apex, separated from apex of cell r by 0.96 times of its own length; cross vein m-cu equal to length of 3r-m, located distal to middle of cell rm; cross vein cu-a nearly at middle of cell mcu; vein M+Cu almost straight and 1A arched upward, cross vein a distant from cu-a.

Material examined.

Holotype, No. CNU-HYM-NN-2012147.

Distribution.

Jiulongshan Formation; Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China (41°18.979'N, 119°14.318'E); latest Middle Jurassic of the Bathonian-Callovian boundary.

Etymology.

The species epithet is derived from the Latin word “dimidius”, meaning half, referring to the pterostigma being more infuscate in the posterior half.