Tricholabidura elongata Peng & Engel, 2022

Ancheng Peng, Michael S. Engel, Yuhui Zhuang, Ziying Wu, Chen Feng & Yu Liu, 2022, A new genus of striped earwigs allied to Zigrasolabis in mid- Cretaceous Kachin amber (Dermaptera: Labidurida), Cretaceous Researc 139, pp. 1-7 : 4-6

Tricholabidura elongata Peng & Engel , sp. nov. ( Figs. 1 ̅ 3)

Etymology. The specific epithet is taken from the Latin ̅ elong ̅ atus, meaning, “elongate”, and refers to the elongate antennae and legs,particularly the secondtarsomere.

Holotype. ♀, YKLP-AMB-003 , deposited in the research collection of the Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China.

Locality and horizon. Hukawng Valley , Kachin State, northern Myanmar; upper Albian ̅ lower Cenomanian (ca. 98.79 ± 0.62 Ma). Diagnosis. As for the genus (vide supra).

Description. ♀: Total length as preserved (excluding forceps and antenna) approximately 13.4 mm, with forceps total length approximately 16 mm; integument (as preserved) brown to light brown; with scattered punctures, particularly setigerous punctures, otherwise largely imbricate; head prognathous with length (to apex of clypeus) 1.8 mm, width (across compound eyes) 1.9 mm; surface not tumid except slightly tumid area on frons, otherwise relatively flat; ecdysial cleavage scar faint; compound eyes prominent, length 0.49 ̅ 0.53 mm, width between inner margins of compound eyes 1 mm; temple corner rounded with series of stiff, erect bristles, such bristles extending along posterior margin of head; clypeus with scattered, relatively long setae; maxillary palpus ( Fig. 2C, D ) length 1.5 mm, with short setae and several long setae; labial palpus length 0.64 ̅ 0.7 mm; ligula and prementum highly sclerotized, length 0.36 mm; antenna elongate, more than half of total body length, length (as preserved) 9 mm, with scattered, minute setae, with at least 30 antennomeres ( Fig. 2A, B ); scape shorter than distance between compound eyes, length 0.62 mm; pedicel length and width about 0.12 mm; flagellomere I length about 2.4 × width, length 0.27 mm, flagellomere II length 0.10 mm, flagellomere III length 0.16 mm; remaining flagellomeres gradually and progressively longer, shape gradually more filiform; pronotum subquadrate, 1.48 mm wide, 1.42 ̅ 1.49 mm long, slightly narrower than head, longitudinal groove of pronotum with numerous prominent and short setae, anterior margin gently convex with numerous prominent and elongate setae, anterolateral corners relatively angulate, lateral margins slightly converging posteriorly with scattered, short, suberect setae, posterolateral angle rounded with short setae, posterior border weakly convex. Tegmen long, rectangular, with numerous fine setae, length, as preserved, 2.83 ̅ 3.12 mm (one tegmen damaged and twisted), width 0.75- ̅ 1.06 mm (wider medially, lateral margins slightly converging posteriorly in apical quarter); humeral angle rounded, relatively straight; lateral margin slightly convex but generally parallel with inner margin; hind wing present and fully developed, with posteriorly directed setae, squama length 1.05 ̅ 1.15 mm, width 0.57 ̅ 0.70 mm. Legs long, slender; femora swollen, with numerous

elongate prominent setae; tibiae with abundant short setae and several thickened, elongate bristles; tarsi trimerous with spines or bristle-like setae ( Fig. 3C ̅ E). Abdomen long, with abundant subappressed, fine setae ( Fig. 2E ); surface relatively smooth with scattered, shallow, coarse punctures; length approximately 8.5 mm (excluding forceps); segments transverse, maximum width 2.3 mm; basal segments overlapped by tegmina; lateral margins relatively straight; slightly wider at midlength; pygidium prominent ( Fig. 3B ), basal width 0.23 ̅ 0.28 mm, medial length (excluding apical process) 0.42 mm, with prominent, slender, medioapical process, process length 0.12 ̅ 0.14 mm; gonapophyses elongate, slender, length 0.48 ̅ 0.56 mm; forceps nearly oval in cross section, glabrous, length 2.1 ̅ 2.3 mm, basal maximum width 0.51 mm, separation between bases 0.52 mm.

ZooBank LSID: This nomenclatural act is registered in ZooBank (www.zoobank.org), the official registry of the International Commission on Zoological Nomenclature, with the following LSID: urn:lsid:zoobank.org:act:A247327C-DC3C-4BED-AE9B- BAA4ED16C4AC.

Figures

Fig. 1. Female of Tricholabidura elongata gen. et sp. nov., holotype, YKLP-AMB-003; Scale bars for all ¼ 1.0 mm. (A), Dorsal view. (B), Line drawing of A. (C), Ventral view. (D), Line drawing of C. Abbreviations: a ¼ antenna; d ¼ dorsal valvulae; f ¼ forceps; gp ¼ gonapophyses; hw ¼ hind wing; mp ¼ maxillary palpus; pr ¼ pronotum; te ¼ tegmina.

Fig. 2. Female of Tricholabidura elongata gen. et sp. nov., holotype, YKLP-AMB-003; A, E Images taken under green epifluorescence; scale bars for all ¼ 0.5 mm. (A), Dorsal view. (B), Line drawing of antenna in dorsal view. (C), Head in ventral view.(D), Line drawing of head in ventral view.Note the mouthparts consisting of maxillary palpus (blue), galea (orange red), lacinia (light green), labial palpus (yellow), and paraglossa (pink). (E), Tegmina and hind wing (arrow indicates setae). Abbreviation: ap ¼ apical papilla; avc ¼ anterior ventral cervical; e ¼ compound eye; f ¼ forceps; fr ¼ frons; fl ¼ flagellomeres; F1̅F28 ¼ flagellomeres I̅XXVIII; hw ¼ hind wing; lp ¼ labial palpus; lr ¼ labrum; mp ¼ maxillary palpus; pe ¼ pedicel; pg ¼ paraglossa; pr ¼ pronotum; pvc ¼ posterior ventral cervical; te ¼ tegmina; s ¼ scape; su ¼ submentum.

Fig. 3. Female of Tricholabidura elongata gen. et sp. nov., holotype, YKLP-AMB-003; D Image taken under green epifluorescence. Scale bars for A, 0.5 mm, for B̅E, 0.2 mm. (A), Abdominal sterna in ventral view.(B), Abdominal apex in ventral view.(C), Tarsi in ventral view. (D), Tarsi in ventral view (epifluorescence).(E), Line drawing of tarsi in ventral view (each leg labelled with a different colour). Abbreviations: ar ¼ arolium; avc ¼ anterior ventral cervical; cl ¼ pretarsal claw; d ¼ dorsal valvulae; f ¼ cercal forceps; gp ¼ gonapophyses; mst ¼ mesosternum; p ¼ pygidium; pst ¼ prosternum; pvc ¼ posterior ventral cervical; ta1̅3 ¼ tarsomeres I̅III.