Jurakempynus loculosus, Ma & Shih & Ren & Wang, 2020

Ma, Yiming, Shih, Chungkun, Ren, Dong & Wang, Yongjie, 2020, New lance lacewings (Osmylidae: Kempyninae) from the Middle Jurassic of Inner Mongolia, China, Zootaxa 4822 (1), pp. 94-100 : 97-98

Jurakempynus loculosus sp. nov.

( Fig. 2 )

Zoobank LSID: urn:lsid:zoobank.org:act:35431551-EB67-40EC-BF43-0C7277EEA6E2

Etymology. From the Latin loculosus , meaning subdivided in compartments, referring to the multi-row cells between MA and MP in the hind wing.

Type material. Holotype CNU-NEU-NN2020002 ( Fig. 2 ).

Locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, Aalenian/Bajocian boundary, Middle Jurassic.

Diagnosis. Forewing: slender and oblate, membrane scattered with numerous small markings, especially densely packed at the wing margin; radial crossveins irregularly spaced, not forming gradate series; A2 about half as long as A1, dichotomously branched close to base, the first branch pectinatedly branched. Hind wing: membrane without obvious spots; sinuate and irregular crossveins arranged in intramedial area to produce three rows of irregular cells; CuP long, with 14 oblique pectinated branches medially; anal region relatively small; A1 shorter than half length of CuP, and proximal branches denser to CuP branches; A3 distally fused with the first branch of A2.

Description. Only the forewing and nearly two thirds of the hind wing preserved. Forewing about 28.03 mm in length, 8.63 mm in width. Hind wing about 14.10 mm in length as preserved, 7.61 mm in width.

Forewing ( Fig. 2A and C ): nygmata undetected; trichosors well-defined along the wing margin; distally forked subcostal veinlets piecemeally appeared; RP branches more than 20, slightly incurved downward, and closely arranged; MA and MP parallel, sub-equal in lengths, and forming 3–4 simple branches distally; CuA symmetrically biforked distally, each branch forming 3–4 complicated pectinated branches, forming a large triangular region; CuP about three quarters of CuA, with three simple branches; A1 long and parallel to the posterior margin, forming irregular 11 pectinated branches; A3 simple not branched.

Hind wing ( Fig. 2B and D ): membrane spotless, gradually paler near the wing base; costal region basally narrowed and then distinctly expanded; subcostal veinlets simple; numerous crossveins in radial area arranged irregularly, not forming a gradate series; sinuous veins present between the bases of RS1 and MA; M forked at wing base before RP1 from RA; MP with 5 pectinated branches; CuA with 8 pectinated branches, then each branch forming dichotomous branching; A2 with 3 simple branches.

Remarks. Five species of Jurakempynus were described from the Daohugou locality of the Middle Jurassic, Shar-Teg locality, Mongolia and Karatau locality, Kazakhstan of the Late Jurassic. The distribution of these localities suggested that the genus experienced a distinct dispersal during the Jurassic. They shared the following apomorphies: forewing CuA forked at the middle, and each fork with complex branches; CuP forming 3–4 distal simple branches; hind wing M region widened, with more than two rows of cells occupying almost the entire length of M; MA and MP only forming distal forks in the hind wing; outer gradate series of both wings apparently lacking in radial area ( Wang et al. 2011; Khramov 2014b; Khramov et al. 2017).

Jurakempynus loculosus sp. nov. can be distinguished from Jurakempynus epunctatus Wang, Liu, Ren & Shih, 2011 and Jurakempynus bellatulus Wang, Liu, Ren & Shih, 2011 by irregular crossveins forming three rows of cells in the whole M region of hind wing rather than irregular cells only at middle as in J. epunctatus , or cells of M region arranged regularly, as in J. bellatulus . The new species differs from J. sublimis Khramov, 2014 , whose M region of hind wing is relatively narrower and with an additional row of cells is short and narrow. Another distinctive feature of the new species is the shape of A2, being relatively long and bent, more than half the length of A1. In addition, compared to Jurakempynus species with preserved forewing ( J. sinensis Wang, Liu, Ren & Shih, 2011 and J. arcanus Khramov, 2014 ), the forewing of the new species is characterized by a unique shape and markings —being slenderer and oblate (The ratio of the length to the width of forewing is about 3.25, those two species are about 3) instead of falcate and without spotted areas ( Wang et al. 2011; Khramov et al. 2014b).

Figures

FIGURE 2. Lance lacewing Jurakempynus loculosus sp. nov., Holotype from the Middle Jurassic of Jiulongshan Formation in Daohugou, China. A–B. Holotype CNU-NEU-NN2020002. Photo 2B is flipped left to right for easy comparison with C and D. C–D. Line drawings of of Jurakempynus loculosus sp. nov.; forewing (C), hind wing (D). A. Scale bar is 10 mm. B–D. Scale bar is 5 mm.