Obhylius Germann, 2021

Germann, Christoph, 2021, Two new Cotasteromimina from Borneo (Coleoptera, Curculionidae: Molytinae), Zootaxa 4933 (4), pp. 567-574 : 569

Obhylius Germann , gen. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:CE2CB056-D577-47CA-82AC-395AF559A2E4

Type species: Obhylius arboricola Germann sp. nov. by monotypy.

Description: Head globular, partly hidden in pronotum. Rostrum short and stout, bent downwards and straight ( Figs 1 A-D). In dorsal view widening anteriad. Eyes oval, larger than width of rostrum at base and weakly protruding from outline of head ( Fig. 1 D). Antennae with six funicular segments, second segment partly hidden in first. Club oval, large, as long as funicular segments together ( Fig. 1 H). Prothorax cylindrical, constricted before front and hind margins ( Fig. 1 A). Front margin of prothorax in ventral view angularly emarginate ( Fig. 1 B). In ventral view, both, front and hind margins of prothorax with fringes of appressed, scale-like bristles ( Fig. 1 B). Scutellum pentagonal. Elytra wider than prothorax with prominent shoulders, hind wings present. Elytra with ten striae, stria 10 shortened and bent into 9 after first third of elytral length. Striae with coarse punctation, intervals of same width, weakly vaulted. Inner side of elytra at apex without stridulatory ridges. Prothorax and elytra with weakly bowed, adjacent and long and clubbed scales. Venter with procoxae separated by one third of coxal diameter, metacoxae separated by half coxal diameter and metacoxae separated by little more than diameter of a coxa ( Fig. 1 B). All ventrites with sutures clearly visible ( Fig. 1 G). Legs stout all femora with femoral tooth ( Figs 1 J-K). Tibiae uncinate, premucro present. Tarsi with bilobed third tarsomere, claws free. Male genitalia with large tegminal plate, short lobes and long tegminal apodeme ( Figs 1 E-F).

Derivation of name: The genus name is an anagram of the name Hylobius Germar, 1817 , a well known genus of Hylobiinae in the Palaearctic and Nearctic Regions. Obhylius arboricola sp. nov. is similar in its habitus and shares some characters with this genus. Gender masculine.

Remarks: Anew genus of Molytinae (Curculionidae) , here assigned to the tribe Pissodini , subtribe Cotasteromimina . It shares the characters originally proposed by Morimoto (1962b), and redescribed by Germann & Grebennikov (2020): 1.) abdominal process between hind coxae much broader than the coxal width; 2.) robust rostrum, relatively short and not more than 1.1x longer than pronotal length; 3.) eyes in lateral view closely approximate to front margin of pronotum, width of temples less than the diameter of the eye. Furthermore, the raised scales on the elytra (as long as distance between intervals), and the peculiar character of the second segment of the antennal funiculus hidden inside the first one, are characters shared with Pseudohylobius ( Morimoto 1962a) . In Pseudohylobius the antennal funiculus consists of seven segments and a broad short oval club, whereas the funiculus of Obhylius counts six segments with a more elongate-oval club whose rather elongate glabrous base might indicate the inclusion of the seventh segment ( Fig. 1 H). Obhylius also shares characters with Hylobiini . The fringes of bristles along front ( Fig. 1 I) and hind margins of the underside of the prothorax, the very prominent strongly uncinate apex of the tibiae, the shape of the tibiae itself, and the presence of a femoral tooth ( Figs 1 J-K) are similar to those of Hylobiini (e.g. Hylobius ), although these fringes consist of conspicuously flattened bristles in the case of Obhylius .

The new genus is placed in the more utilitarian than phylogenetically supported subtribe Cotasteromimina .

Figures

FIGS 1A-K. Habitus, genitalia and details of the male holotype of Obhylius arboricola Germann gen. nov., sp. nov. A-C. – habitus dorsal, ventral and lateral. D. – dorso-lateral view on head and rostrum. E-F. – penis in ventral and lateral views (tegmen and part of apodemes of penis broken). G. – ventrites. H. – antennal funiculus. I. – fringe of characteristic flattened bristles at front margin of prothorax. J. – tooth on left profemur, outer side. K. – tooth on left metafemur, inner side (Photos: C. Germann).