Jersiberotha musivum, Zhang & Yang & Chen & Liu & Cao & Xie, 2022

Zhang, Sihang, Yang, Yihong, Chen, Jiayi, Liu, Liming, Cao, Zhendong & Xie, Sanping, 2022, A new species of beaded lacewings (Neuroptera, Berothidae) from mid-Cretaceous Myanmar amber, ZooKeys 1092, pp. 93-104 : 93

Jersiberotha musivum sp. nov.

Diagnosis.

Jersiberotha musivum may be easily distinguished from the other four species of Jersiberotha by a combination of the following character states: in forewing, two cross-veins ra-rp are present; inner or outer graduate series of cross-veins are absent; RP has three branches; ma-mp cross-veins and cua-cup cross-veins are absent; and basal cross-vein 1r-m is absent from hind wing.

Etymology.

The specific name is from the Latin " musivum " (meaning “mosaic”), in reference of the new species with some characters in wing venation occurring mosaically in both two similar genera, i.e. Iceloberotha and Jersiberotha .

Locality and horizon.

Noije Bum Hill, Hukawng Valley, Kachin State, Myanmar; lower Cenomanian, mid-Cretaceous.

Material examined.

Holotype LZUGSW20210219; deposited in the Institute of Paleontology and Stratigraphy , School of Earth Sciences, Lanzhou University, Gansu Province, China.

Description.

Female (Fig. 1A ). Body length ca. 1.50 mm as preserved. Head: oval in lateral view, length ca. 0.2 mm. Compound eyes prominent, ovoid, large, length ca. 0.14 mm. Vertex with sparse long setae. 3rd and 4th segments of maxillary palpus relatively short, approximately twice as long as wide; apical tarsomere elongated, very acute distally, approximately five times as long as wide. Labial palpus not fully visible. Antenna: length ca. 0.5 mm (Fig. 1B ), scapus elongate, approximately three times as long as maximum width; pedicellus elongate, approximately two times longer than maximum width and slightly broader than flagellomeres; the following 21 flagellomeres, cylindrical, slightly longer than wide, with relatively long setae around; basal flagellomeres transverse, distal flagellomeres slightly elongate; apical flagellomere conical.

Forewing: narrowly slender and oval shaped (Fig. 2A, B ), length ca. 1.70 mm, width ca. 0.55 mm. Leading edge with short setae, trailing edge with long setae. Costal space narrow, slightly narrowed medially. All subcostal veinlets simple, basal and distal subcostal veinlets slightly curved. Humeral veinlet cross-vein-like. Subcostal space nearly as broad as costal space, proximal cross-vein (1scp-r) located proximad at origin of RP; ScP terminating at RA. ScP+RA entering margin before wing apex, shallowly forked distally with five short branches. RA space a little broader than subcostal space, with only two cross-veins present, the basal one proximad to middle of wing and the distal one proximad at fusion of ScP and RA. RA slightly thickened; RP originating from RA relatively distant from wing base, with two long branches originating between 2ra-rp and 3ra-rp and one short branch distad at 3ra-rp. RP1 with 2 branches, primary fork distad at 3ra-rp, one branch not forked, other with three pectinate distal branches; stem of RP, RP2 and RP3 shallowly forked. No cross-veins between branches of RP. M fused with R basally. One cross-vein between RP and M (2r-m) connecting stem of RP and MA. M basally approaching R; forked nearly at origin of RP. MA forked primarily distad at 3ra-rp, proximal branch with two pectinate distal branches, distal branch once forked distally; MP forked primarily between 2ra-rp and 3 ra-rp, proximal branch with two pectinate distal branches, distal branch once forked distally. No cross-veins between MA and MP. Two cross-veins between M and Cu: 1m-cu connecting M and Cu distad at origin of CuP; 2m-cu connecting MP and CuA. Cu divided into CuA and CuP rather far from wing base. CuA and CuP dichotomously branched. No intracubital cross-veins. One cross-vein (1cu-aa1) between Cu and AA1 connecting CuP, AA1 much proximad to their branching. AA1 once forked distally, AA2 thickened, pectinately branched, with two short branches. AA3 short, simple. Marginal setae long to very long and arranged in bunches at end of veins and trichosors. Trichosors prominent along entire wing margin. Wing membrane hyaline, with following dark brown maculation; narrowly margined cross-vein 2ra-rp, 3ra-rp and 2r-m; widely margined cross-vein 2m-cu; spots at origin (inside) of RP, RP1, RP3 and at primary forks of RP1, MA, MP, CuA and CuP.

Hind wing: narrowed proximally, broadened distally, length ca. 1.40 mm, width ca. 0.55 mm (Fig. 2C, D ). Costal space strongly narrowed medially, slightly dilated proximally and strongly dilated distad at fusion of ScP and RA. Subcostal veinlets simple, closely spaced; distal subcostal veinlets strongly oblique, thickened. Subcostal space rather broad, basally appears narrowed; no cross-veins detected. ScP stout, nearly straight before terminating at RA, ScP + RA entering margin far before wing apex, veinlets are difficult to be accurately counted, but it appears there are six veinlets. RA space clearly wider than subcostal space, with one cross-vein proximad to fusion of ScP and RA, none distad. RP originating rather far from wing base, with two branches originated proximad to 3ra-rp, none distad. Stem of RP, RP1 and RP2 shallowly once forked. No cross-veins between branches of RA, RP and M; basal 1r-m absent. M basally fused with R; forked distad origin of RP. MA and MP nearly parallel for most of the length; MA dichotomously branched; MP pectinately branched, with two short simple branches, no intramedian cross-veins. Cross-veins between M, Cu (1m-cu) not discernible. CuA pectinately branched, with three short simple branches. CuP and AA1 not detected. Marginal setae very long, arranged in bunches at end of veins, especially along hind margin. Wing membrane hyaline, without maculation.

Abdomen oval, stout. All segments clearly visible except terminal-most, with broad membranous space between sternites and tergites (Fig. 3A ). Tergite I not visible, Tergite II and sternite II shorter than tergites and sternites of abdominal segments III - VII, without specialised modifications. Tergite VIII well developed, dorsally broader than laterally, elongate and extending towards the sternite. Tergite IX not clearly identified, sternite VIII reduced. The genitalia structures of the new species are not well preserved, the pair of ectoprocts (e) are slightly shorter than the other pair of gonocoxites (gcx) and the unpaired club-shape process may be a part of inner genitalia (Fig. 3B, C ). All tergites and sternites covered with dense, long fine setae.

Figures

Figure 1. Jersiberotha musivum sp. nov. Holotype LZUGSW 20210219 A photograph of holotype habitus (lateral left view) B photograph of head, pedicel (Pe) and scape (Sp) C photograph of antenna, maxillary palpus (Mp) and labrum (La). Scale bars: 1 mm (A); 200 μm (B); 100 μm (C).

Figure 2. Wing venation of Jersiberotha musivum sp. nov., Holotype LZUGSW 20210219 A photograph of forewing B line drawing of forewing C photograph of hind wing D line drawing of hind wing. Scale bars: 500 μm (A, B); 200 μm (C, D).

Figure 3. Abdomen and genital of Jersiberotha musivum sp. nov., Holotype LZUGSW 20210219 A abdomen, lateral view B terminal segments, ventro-lateral view C terminal segments, lateral view. Scale bars: 200 μm (A); 100 μm (B, C).