Pentarthrum Wollaston 1854

Omar, Youssef M., Zhang, Runzhi & Davis, Steven R., 2010, Description of a new species of Pentarthrum Wollaston (Coleoptera: Curculionidae: Cossoninae) from China with an annotated checklist to species of the World, Zootaxa 2629, pp. 47-60 : 48

Pentarthrum Wollaston 1854

Pentarthrum Wollaston 1854: 129 . Type species Pentarthrum huttoni Wollaston 1854: 130 by monotypy.

Diagnosis. Species of Pentarthrum can be recognized by the following characters: Body more or less narrow, nearly parallel, closely sculptured, nearly free from scales or pubescence, slightly shining; head conical, somewhat constricted behind eyes; eyes prominent; distance between eyes and post-ocular constriction much shorter than the diameter of eye; rostrum more or less subparallel or slightly expanded towards apex in dorsal view, longer than head; antenna almost medially inserted; scape reaching middle of eye, funicle five segments; club expanded, rounded at apex, first article of funicle distinctly narrower than club, second article longer than the third; pronotum longer than wide, conical, narrowed forward, constricted at apex; scutellum conspicuous; third tarsal joint slightly expanded, cordate, excavate dorsally but not lobate ( Wollaston 1854, 1873a, 1873b; Voss 1955; Folwaczny 1960, 1973; Morimoto 1973; Anderson 2002).

Diversity. Pentarthrum was established in 1854 by Wollaston based on the species P. huttoni from England. In 1936, Csiki reported that Pentarthrum contained 66 species from around the world. Presently 50 species are recognized in the genus. Here provided is a checklist to the 38 species belonging to this genus which were described from 1854 to 1936. as well as the additional 11 species described from 1936 to 1961. Since 1961 no additional species have been described other than the one described herein.