Humiryssus leucus Lin, 1980

ZHANG, HAICHUN, 2021, Re-description of the Cretaceous wasp Humiryssus leucus Lin, 1980 (Hymenoptera: Evanioidea: Baissidae), Palaeoentomology 4 (5), pp. 425-428 : 426-427

Humiryssus leucus Lin, 1980

( Figs 1 and 2 )

Holotype. NIGP38557 , a female in laterodorsal aspect with legs incomplete, and hindwings lacking.

Diagnosis. Forewing with 2r-m present as stubs on both Rs and M, where RS and M are bent. Ovipositor slightly bent upwards with sheaths about 0.6× as long as forewing.

Locality and horizon. Laocun Village, Laocun

Town, Jiande City, Zhejiang Province, China; Hauterivian- Barremian, Laocun Formation.

Description. Female. Body with ground colour light, head (including antennae), mesonotal and metasomal dorsum dark brown. Head large, suboval with mouthparts indistinguishable. Eyes large, elongate-oval, occupying most of sides of head. Right antenna incomplete with apical 12 segments preserved; left antenna complete, 13-segmented with scape (very possibly not at the insertion place due to taphonomic changes) thin basally, becoming gradually thicken apically, and longer than wide; pedicel about as thick as scape apically, and as long as wide; flagellum filiform with each flagellomere thin, distinctly or slightly longer than wide. Mesosoma broad-oval; mesonotum with notauli distinct, reaching transscutal suture. Legs with only hind ones distinguished but incomplete; coxa and trochanter small, femur slightly thinner than coxa, tibia as long as femur, tarsus very thin. Forewing with costal area narrow but slightly widened near pterostigma; pterostigma fairly large, nearly semicircular, issuing 2r-rs medially; 2r-rs subvertical, slightly shorter than half of pterostigmal maximum width; cell 3r about 2× as long as wide; 1-Rs and 1-M nearly aligned, 1-RS slightly shorter than 1-M; 1-M about as long as 1m-cu; 2r-m rudimentary as short stubs on both Rs and M; Rs distinctly bent between 3-Rs and 4-Rs; 3-Rs distinctly shorter than 2r-rs; 2-M broadly curved and longer than 3-M; 3r-m rudimentary as stubs on both Rs and M; Rs distinctly bent between 4-Rs and 5-Rs; M greatly bent between 4-M and 5-M; cell 2rm greatly shorter than 3rm and narrower than 3rm distally; 2m-cu complete; 3rm broader than 2mcu; A nearly straight except in cell 2cua curved toward wing posterior margin. Metasoma oval, about 1.8× as long as mesosoma, with seven tergites distinguished and at least two sternites (indicated by dark spots) visible near metasomal apex. Ovipositor slightly bent upwards with sheaths as long as metasoma, and about 0.6× as forewing.

Measurements in mm: Head length 0.45, width 0.52; eye length ca. 0.19 and width ca. 0.07 (as preserved); antennal length 0.97 for left one, 1.10 for right one as preserved; mesosomal length 0.74, width 0.72 mm; metasomal length 1.25, width 0.85; forewing length 1.99, width 0.91; ovipositor sheath length 1.25.

Male unknown.

Figures

FIGURE 2. Humiryssus leucus Lin, 1980, holotype NIGP38557, laterodorsal view, line drawings. A, Habitus. B, Right forewing. C, Left forewing. Scale bars = 1 mm.

FIGURE1.Humiryssusleucus Lin,1980,holotypeNIGP38557, laterodorsal view, photograph. Scale bar = 1 mm.