Panorpidium stenos Yu et Liu H., 2025

Panorpidium stenos Yu et Liu H. , sp. nov.

( Figure 4–5 View FIGURE 4 View FIGURE 5 ).

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Type material. Holotype: MHBU-ORT-0002. A male fossil is poorly preserved, which is filled with bubbles and cracks: the right side is damaged, with a penetrating crack in thorax, head and right prothoracic leg clearly visible, right mesothoracic legs only mesotarsus and distal of mesotibia visible, left mesotibiae and mesotarsus absent, right metafemur partially visible near metatibiae, metabasitarsus obscured by cracks, abdomen absent except near cerci, the basal of right tegmina blur, middle and distal parts partially visible, the left side confused, pronotum and left metafemur near metatibiae visible, tegmina venation with distal and basal near the posterior margin can be seen. Specimen deposited at the Museum of Hebei University (MHBU), Baoding, China.

Locality and horizon. The lowermost Cenomanian, middle Cretaceous. Myanmar: An amber-mine near Tanai Village in the Hukawng Valley.

Diagnosis. This new species resembles P. maculosum Zhou, Xu, Jarzembowski & Xiao, 2022 from Burmese amber, but differs in the following characters: head with special convex and small, regular concave; tegmina lack spot,tegmina present five branches between CuPb basal and 1A, 1A near distal with two short branches; base of protibiae with a pair of small denticles (in P. maculosum , the head smooth, without convex or concave; tegmina with two regular circular spot, distance between CuPb and 1A short, CuPb without branch, 1A distal with four branches; base of protibiae without small denticles). Moreover, this new species maybe resembles P. longirostris ( Penalver & Grimaldi, 2010) , although the type specimen of the latter is a nymph, can be distinguished by the protibiae without long setae, and base with a pair of small denticles (in P. longirostris , the protibiae with long setae, base without symmetrical denticle).

Etymology. The specific name is derived from the Greek “ stenos ” (narrow, slim), referring to the frons with a long and narrow convex.

Description. Head hypognathous, longer than wide obviously; frontal tubercle flat, smooth; vertex smooth; eyes large, ovoid, protruding distinctly outward, positioned dorsally on the head dorsal; interocular distance twice the width of the scape; scape cylindrical, larger and thicker than pedicel; pedicel pyriform, the length and width approximately half those of the scape; the binding site between two antennomere is dark, with a pair of opposite setae distally; antennal cavities flanked by two small triangle-like concave and a narrow longitudinal convex between two triangle-like cavities; frontoclypeal sulcus both sides straight, with a small triangle-like curved in middle; maxilla laciniae inner curved, with four denticles distally, galea large and smooth; labium apical area narrow, with hair ( Fig. 4A, B, C, D View FIGURE 4 ).

Pronotum saddle-shaped, smooth; disc more than a third of body length, front and middle of disc flat and hind part faint convex, distal prolonged, lateral margins rounded into paranota; lateral lobe flat, ventral margin convex and posterior margin concave, the length of convex longer than concave ( Fig. 4E, F View FIGURE 4 ).

Tegmina membranous, narrow. RA distal with one narrow, dark pterostigma, with a cross-vein between RA and RP; RP has two parallel branches connected by one cross-vein; M divided into MA and MP in the middle of tegmina, MA divided into MA1 and MA2 near tegmina middle, MA1 has three cross-veins between MA1 and the RP branch which close to MA1, a large dark area extending from MA1 end to tegmina distal and extended to the middle of RP distal branch, MA2 parallel with MA1, two branches end posterior margin, interconnected by three cross-veins; MP has two branches to posterior margin and a cross-vein between MA2 and MP; CuPa differentiated into CuPaα and CuPaβ basally, CuPaα obscured, perhaps curved upward and fused basally with CuA, CuA+CuPaα band down and end in posterior margin, close MP; CuPaβ fused with CuPb distal, two cross-veins between CuPaβ and CuPb; 1A with two branches, five cross-veins between 1A and CuPb, finally fused with CuPaβ+CuPb and end in posterior margin ( Fig. 5E, F View FIGURE 5 ).

Legs cover with short hairs. Pro- and mesofemora with a pair of minute dorsal apical lobules; pro- and mesotibiae with a pair of ventral apical spurs, protibiae close base has a pair of symmetrical small denticles; the length of pro- and mesotarsomere I longer the combined length of II and III, ventrally with dense spines-like setae and a pair of apical spurs; pro- and mesotarsomere II short, with a pair of apical spurs; pro- and mesotarsomere III simple; metafemora sturdy; metatibiae shorter than metafemora, dorsal basal with two rows of minute denticles, metatibiae has a single proximal dorsal spur and three pairs of large, leaf-like dorsal spurs, with two pair of apical spurs, the dorsal apical spurs almost as twice long as the ventral one; metatarsomere I about twice of III, with a pair of large apical spurs and apical lobules respectively; metatarsomere II small, with a pair of apical lobules; metatarsomere III simple ( Fig. 5A, B, C, D View FIGURE 5 ).

Abdomen short, only one cercus visible, short.

Measurements. Length of body 7.96 mm; eyes diameter 2.18 mm; scape 0.62 mm long, 0.56 mm wide; pedicel 0.33 mm high, 0.22 mm wide; one antennomere 0.31- 0.28 mm long, 0.06-0.09 mm wide; pronotum 3.82 mm long; lateral lobe 1.71 mm high; cercus 1.26 mm long; profemora 4.16 mm long; mesofemora 4.00 mm long; protibiae 3.15 mm long; mesotibiae 3.46 mm long; protarsomere I 1.17 mm long, 0.13 mm wide; mesotarsomere I 1.37 mm long, 0.08 mm wide; protarsomere II 0.26 mm long, 0.18 mm wide; metafemora 7.65 mm long; metatibiae 6.84 mm long; ds1-ds4 long 0.36, 0.54, 0.56, 0.61 mm; metatarsomere I 1.74 mm long; tegmina 9.72 mm long; 2.07 mm wide.