Macrotrachelos Besuchet & Hlaváč 2011, gen. nov.
Creators: name: Besuchet, Claude
name: Hlaváč, Peter
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Macrotrachelos

description: Macrotrachelos gen. nov.
(Figs. 3, 8)
Type species. Macrotrachelos longiceps sp. nov., by present designation.
Diagnosis. Body large, with a very long head, antennae with three antennomeres, last antennomere very long, clavate, slightly oblique, slightly widened to apex, at apex round, head rectangular, with wide rostrum, well separated from neck, with two trichomes on first visible paratergite.
Description. Whole body (Fig. 3) reddish-brown, shiny, with dense, fine microsculpure, with long, bristle-like setae on posterior part of head, sides of pronotum and posterior part of elytra and abdominal segments.
Head about 2.5 times as long as wide, neck clearly separated from the rest of head, lacking occipital foveae; eyes large, compact, slightly protuberant; temples very long. Venter completely smooth, with very scarce setae mainly on sides, lacking baso-median foveae and gula. Antennae finely pubescent, scape and pedicel very small, pedicel shorter than scape, scape barely visible dorsally, terminal antennomere very long, more than twice as long as head, reaching basal margin of elytra when bent backwards, evenly widened and curved to apex, flat laterally, at apex rounded, with a bunch of long apical setae.
Pronotum rhombic, widest at base and narrowed apically, slightly wider than long and clearly wider than head, with large, discal X-shaped depression, lacking any fovea, scutellum not visible; proventrite punctured, lacking median carina, procoxae contiguous.
Venter of body shiny, with dense, fine puncturation and golden setation on sides of mesoventrite, metaventrite and all other abdominal ventrites, metaventrite at middle slightly longer than mesoventrite, with X-shaped mesoventral process separating mesocoxae, metaventral process slightly rounded; disc of mesoventrite with rough, wrinkled sculpture; metaventrite with deep, triangular basal depression; metacoxae widely separated by large, oval basal metaventral process, first visible sternite (IV) narrow, about as long as sternite VI–VII together, second visible sternite (V) longest, much longer than IV, V, VI and VII together.
Elytra slightly widened posteriorly, finely punctured and pubescent, with about 30 long setae on posterior margin; widest at level of posterior corners, at suture clearly longer than pronotum, humeri normally developed, sutural striae complete and well-defined.
Legs long and stout, tibiae at base very shortly pedunculate, femora clavate, bearing spines and spurs.
Abdomen shiny, finely punctured and pubescent with few long setae, composite tergite (IV–VI) with large, deep basal depression, Paratergites of composite tergite elongate, bearing small trichomes on dorsal as well as on lateral side.
Sexual dimorphism. Female with metaventrite transversely convex, lacking any depression, area between metacoxae straight and lacking long and sharp preapical spines on mesofemora.
Differential diagnosis. Macrotrachelos gen. nov., due to its general appearance of having a very long and rectangular head and rhombic pronotum, can be readily distinguished from any other species of the subtribe Clavigerodina with three-segmented antennae.
Etymology. The name is combination of ‘ macro -’ meaning large size and ‘ trachelos ’ meaning neck. Gender: masculine.
description: Published as part of Besuchet, Claude & Hlaváč, Peter, 2011, Contribution to the knowledge of Clavigeritae (Coleoptera: Staphylinidae: Pselaphinae) from Fiji and Vanuatu, with the catalogue of Clavigeritae of Oceania, pp. 517-528 in Acta Entomologica Musei Nationalis Pragae 51 (2) on pages 524-525, DOI: 10.5281/zenodo.5328923