Tricholabidura 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 : 3-4

Genus Tricholabidura Peng & Engel , gen. nov.

Type species: Tricholabidura elongata sp. nov.

Etymology. The new genus-group name is a combination of the Ancient Greek trikh́os (T P ῐ X ό ς, genitive of thríx / Ɵ ρ ῐϵ, meaning, “hair”), and Labidura Leach , itself a combination of the genitive of the noun labís (λ β ῐÇ, meaning, “forceps” or “tongs”; genitive labídos / λ ᾰ β ῐδΟ ς) and the noun our ̅ a (Ο ὐ P ᾱ, meaning, “tail”). The gender of the name is feminine.

Diagnosis. Stout, modestly large earwigs (approximately 13.4 mm in length), somewhat dorsoventrally compressed; integument not chaetulose, with abundant, scattered, fine, short setae on tegmina and abdominal terga, including fine apical margin fringes of posteriorly directed setae (forming vibrissae-like fringes), and more widely scattered on other sclerites; temples of head with numerous long, erect bristles, such bristles less numerous but also present along pronotal margins and sparsely on thoracic sterna; integument matte and seemingly imbricate and impunctate (except setigerous punctures). Head slightly wider than long, not tumid, posterior border relatively concave with fine bristles, frons darker in colour making it distinctive among head regions; compound eyes large, separated from posterior border of head by slightly more than compound eye length; ecdysial cleavage lines faint; antenna with at least 30 antennomeres, total length more than one-half body length; scape sturdy, long, shorter than interocular distance but longer than compound eye length; pedicel small, length and width subequal; flagellomere I distinctly longer than wide, longer than combined lengths of flagellomeres II and III, flagellomere II slightly longer than wide, succeeding flagellomeres gradually more filiform; anterior ventral cervical sclerite narrow and greatly transverse, posterior cervical sclerite large, with apical margin broadly and gently protruded medially, surface with at least a couple prominent bristles, ́

lateral margins converging posteriorly, posteriorly narrower than prosternum. Pronotum subquadrate, slightly narrower than head, longitudinal groove of pronotum with numerous prominent and short setae, anterior margin gently convex with numerous prominent and elongate bristles, anterolateral corners relatively angulate, lateral margins slightly converging posteriorly, posterolateral angle rounded with short setae, posterior margin weakly convex; prosternum twice as long as wide, with procoxae positioned in posterior half, anterior margin gently convex and abutting posterior cervical sclerite, lateral margins straight and converging posteriorly, posterior margin straight, surface with some prominent bristles and shorter finer setae. Tegmina well-developed and long (extending to at least apical margin of abdominal tergum II), approximately rectangular, with blunt apices, surface with numerous fine setae; hind wings present and well-developed, squama as on tegmen. Femora neither compressed nor carinulate, with numerous prominent elongate setae; tibiae with abundant short setae, and several thickened, elongate spine-like bristles; tarsi trimerous with spines or bristle-like setae on surface, many extending beyond apex of each tarsomere; tarsomeres elongate, tarsomere shortest tarsomere but still long, tarsomere II more than 0.5 × length of tarsomere I, slightly extended beneath base of tarsomere III; pretarsal claws long and stout; arolium swollen. Abdomen long, comparatively slender, roughly parallel-sided; terga broader than long, with apical margins straight; pygidium slightly exposed, subtriangular, with short, acute, medioapical projection, apex acutely rounded; dorsal valvulae and gonapophyses long, slightly extended as preserved; antepenultimate sternum broader than long, apical margin straight; penultimate sternum broader than long, apical margin strongly convex medially, broadly and subtriangularly rounded medially; terminal sternum simple, apical margin weakly convex; female forceps symmetrical, broadly separated at bases, smooth and stout, parallelsided in proximal third, then angled and narrowing gradually to apex, apical third subfalcate, apex acutely rounded, without flanges, serration, or dentition.

Remarks. The genus differs from Zigrasolabis in the larger body and more slender shape, antenna longer than half the body, more elongate legs and tarsomere II more elongate, abundant tegminal abdominal pubescence, longer tegmina, abundantly and finely setose abdominal terga, marginal vibrissae, exposed pygidium, apical sternum with medioapical margin produced as broadly rounded lobe, cerci somewhat broad in proximal third before tapering gently to acutely rounded apices, apical third subfalcate, and somewhat exposed valvulae.

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:D35DD0E0-705E-435A-A47A- C60911528364.