On the Cephennium fauna of the Iberian Peninsula and the Atlantic Islands (Coleoptera, Staphylinidae, Scydmaeninae) Author Assing, Volker text Linzer biologische Beiträge 2021 2021-02-28 52 2 891 931 journal article 172795 10.5281/zenodo.5039032 7eb79be8-aa10-4707-a05e-e856090182de 0253-116X 5039032 A65F79A5-2F0E-450C-994C-608C6D3C1A69 Subgenus Macroderus CROISSANDEAU , 1894 Macroderus previously included a single species, the type species C. divergens REITTER, 1884 from Aragón (Northeast Spain). Species of this well-defined subgenus are characterized by the following character combination: body broad and robust, strongly convex (cross-section); colouration reddish to reddish-brown; antennae slender, antennomeres VI and VIII not transverse, VII only indistinctly longer and larger than VI and VIII at most, and IX and X weakly transverse, less than 1.5 times as broad as long; eyes composed of approximately five to seven large ommatidia; pronotum strongly transverse, at least 1.25 times as broad as long, very shiny; punctation sparse and extremely fine, barely noticeable even at high magnification (100 x); pubescence long and suberect to depressed; elytra broad, strongly convex in cross-section, anteriorly with a lateral humeral carina only and with a pronounced sulcus originating from the anterior impression; hind wings reduced; metaventrite practically impunctate and very glossy; legs without appreciable sexual dimorphism; all tibiae more or less distinctly clavate, i.e., very narrow in basal half and distinctly dilated in apical half; male metaventrite more or less distinctly impressed; aedeagus with bulbous capsule, short and often broad ventral ventral process, and with internal structures partly composed of clusters of filaments; parameres thin, reaching apex of median lobe, or nearly so, and with moderately long apical seta. Several of these characters (shape and punctation of pronotum; pronotum strongly transverse; elytra with prounced lateral humeral carina, without supra-humeral carina, and with a pronounced sulcus extending from anterior impression; metaventrite practically impunctate; all tibiae without sexual dimorphism; derived morphology of the aedeagus) are unique in the genus and partly evidently synapomorphic. For this reason, the subgeneric status Macroderus is retained for the purpose of the present paper.