Praeaulacus subrhombeus, Li, Longfeng, Shih, Chungkun & Ren, Dong, 2014

Li, Longfeng, Shih, Chungkun & Ren, Dong, 2014, New fossil Praeaulacinae wasps (Insect: Hymenoptera: Evanioidea: Praeaulacidae) from the Middle Jurassic of China, Zootaxa 3814 (3), pp. 432-442 : 435

Praeaulacus subrhombeus sp. nov.

( Figs. 2 and 3 )

Etymology. The specific name is from Latin “ subrhombers ” meaning approximate rhombus, referring to the first metasomal segment nearly rhomboid in shape.

Type material. Holotype: female. No. CNU-HYM-NN-2012034(P/C). Well preserved with almost complete body, antennae and wings. Color brown.

Occurrence. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China, Jiulongshan Formation, late Middle Jurassic (Callovian–Bathonian boundary).

Diagnosis. Fore wing with 1r-rs absent; first abscissa of Rs shorter than that of M; 2r-m far basad of 2m-cu; cu-a postfurcal. Hind wing with r-m straight; first abscissa of M slightly bent and meet M+Cu basad of Rs original; cu-a very short. First metasomal segment more or less rhomboid shaped.

Description. Head medium-sized, transversely broad, nearly 1.7 times as wide as long. Antenna with scape small, other segments not preserved. Mesosoma broad, nearly 1.2 times as long as wide. Fore wing with first abscissa of Rs both shorter than that of M and that its distance to pterostigma; pterostigmal base distinctly closer to Rs origin than to 2r-rs; 1r-rs absent, 2r-rs arising from pterostigma at its basal 0.5 length, slightly longer than maximal width of 2rm and meeting Rs far basad of 2r-m; both of 2r-m and 3r-m slightly oblique, cell 3rm distinct wider than 2rm, but slightly shorter than 2rm; cell 1mcu nearly forming a parallelogram, about 2.3 times as long as wide; 2m-cu meeting M distad of 2r-m and cell 2mcu about 2.2 times as long as wide; cu-a postfurcal and nearly as long as that first abscissa of M. Hind wing with first abscissa of Rs about 1.6 times as long as r-m; first abscissa of M slightly bent and about 3.7 times as long as r-m; cu-a short, meeting Cu beyond the fork of M+Cu into M and Cu, free M, Cu and A long. Metasoma medium-ovoid, with five segments; first segment broad and nearly rhomboid shaped, about 1.6 times as wide as long; second to fourth slightly shorter and wider than first. Ovipositor shorter than fore wing.

Measurements in mm. Head length 0.8, width 1.3; mesosomal length 2.2, wide 1.8; fore wing length 6.2, width 2.1; first metasomal segment wide length 1.6, length 1.0; metasomal length 3.9; ovipositor length 3.5 (as preserved).

Figures

FIGURE 2 Praeaulacus subrhombeus sp. nov.; Photograph of holotype CNU-HYM-NN- 2012034 (P / C); (A) part, (B) counterpart; Scale bars: 1 mm.

FIGURE 3 Praeaulacus subrhombeus sp. nov. Holotype CNU-HYM-NN- 2012034 (P / C); (A) Line drawing of holotype, body with wings; (B) Line drawing of wings; Scale bars: 1 mm.