Lasiopsychops impunctatus, Bai & Chang & Shih & Ren & Wang, 2019

Bai, Haiyan, Chang, Yu, Shih, Chungkun, Ren, Dong & Wang, Yongjie, 2019, New silky lacewings from mid-Cretaceous Burmese amber (Insecta: Neuroptera Psychopsidae), Zootaxa 4661 (1), pp. 182-188 : 183-185

Lasiopsychops impunctatus sp. nov.

( Figs. 1 , 2 )

Etymology. The specific name is derived from the Latin word “ impunctatus ” in reference to the forewings without any colour pattern.

Type material. Holotype CNU-NEU-MA2017009 ( Fig. 1A ) (female, the characters of the body structures are well-preserved, but parts of the hind wings cannot be distinguished.)

Locality and horizon. Hukawng Valley, Kachin State, Northern Myanmar; lowermost Cenomanian, mid-Cretaceous.

Diagnosis. As for the genus by monotypy.

Description. Female. Body, 6.40 mm long, densely covered with long hairy setae. Head prognathous, short, about 1.07 mm long. Eyes prominent. Antenna filliorm. Mouthparts chewing, labrum short, mandibles well-developed and maxillary palpi 5-segmented, two segments of labial palps detected ( Fig. 2A ). Prothorax slightly arched, wider than long, covered with long setae; mesothorax and metathorax also slightly arched ( Fig. 2B ).

Legs slender, 2.98 mm long, with sparse long setae; tibia thickened, with a pair tibial spurs; tarsi 5-segmented, 1 st tarsomere approximately as long as 2 nd ‒ 4 th tarsomeres combined, 5 th tarsomere long, subequal to 1 st tarsomere; claws slender and curved, arolium prominent ( Fig. 2C ).

Forewing: 13.14 mm long, 6.14 mm wide, sub-triangular, with long setae along margins and veins; trichosors along the entire margin; basal nygma present; costal space equally broad throughout, most costal cross-veins branched, costal gradate series absent; humeral veinlet strongly bent to wing base with six simple branches; Sc and RA fused distally and straightly reaching the margin; subcostal space with 3 cross-veins preserved; RA space with 5 cross-veins preserved; RP with 11 branches, and most branches dichotomously branched; cross-veins in radial space irregularly arranged, not forming long gradate series; M forked at about 1/3 of wing length, MA with three simple branches distally, MP dichotomously branched distally; Cu branched almost from its base, CuA and CuP forming multiple dichotomous branches distally; anal space well developed, A1 forming eight obliquely pectinate branches, A2 deeply forked, with 3-4 dichotomous branches ( Fig. 1B ).

Hind wing: Smaller than forewing, 10.40 mm long, 4.38 mm wide; trichosors present along entire wing margin; costal space broad throughout, subcostal space and RA space preserved; the branch of RP not distinguishable clearly; an outer gradate series of cross-veins present in radial space ( Fig. 1C ).

Abdomen short. Sternite 8 with many long setae on the margin; tergite 9 greatly expanded ventrally; ectoprocts paired, covered with long setae (due to preservation, female genitalia only discernible in dorsal view); a pair of gonocoxites 9 (gx 9) present ( Figs. 2D, E ).

Figures

FIGURE 1. Holotype (CNU-NEU-MA2017009) of Lasiopsychops impunctatus gen. et sp. nov., holotype female, photographs. A. Habitus; B. Line drawing of left forewing. C. Right hind wing. Scale bars: 2 mm for A, C; 0.5 mm for B.

FIGURE 2. Lasiopsychops impunctatus gen. et sp. nov., holotype female. A. Mouthparts, lb, labrum, lbp, labial palpus, mxp, maxillary palpus; B. Head and thorax, pro, prothorax, mes, mesothorax, met, metathorax; C. Leg; D. Female genitalia, left ven- tral view; E. Same, right ventral view. Scale bars: 0.2 mm for A, C, 0.5 mm for B, E and 0.25 mm for D.