Plegaderus (Plegaderus)

Lackner, Tomáš & Vienna, Pierpaolo, 2017, Histeridae of Socotra (Coleoptera: Histeroidea), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57, pp. 55-76: 65

publication ID

http://doi.org/ 10.1515/aemnp-2017-0107

publication LSID

lsid:zoobank.org:pub:11855C01-FBC0-4B44-89F8-7C7E0379C8E9

DOI

http://doi.org/10.5281/zenodo.5345836

persistent identifier

http://treatment.plazi.org/id/0E54567F-D334-FFB5-FE38-FC76FC8E5039

treatment provided by

Marcus

scientific name

Plegaderus (Plegaderus)
status

 

Plegaderus (Plegaderus)   sp.

(Fig. 23)

Material examined. YEMEN: SOCOTRA: 1 ♀, Al Haghier Mts., Wadi Madar, 12°33.2′N, 54°00.4′E, 1180–1230 m, 12.–14.xi.2010, P. Hlaváč lgt. ( TLCM).

Comments. Genus Plegaderus Erichson, 1834   contains two subgenera: monotypic Hemitrichoderus Reichardt, 1941   with a single species P. (H.) adonis Marseul, 1876   described from Cyprus and also occurring in Turkey, and the nominotypical subgenus, which contains 27 species spread mostly in the Holarctic Region ( MAZUR 2011). The species from Socotra belongs to the group of species with deeply impressed median stria on pronotum, dividing it into two convex parts ( Fig. 8 View Figs 6–12 ). Other species of this group are: P. (P.) caesus (Herbst, 1791)   , spread across Europe, Turkey, Azerbaijan and north Iran; P. (P.) dissectus Erichson, 1839   spread across southern England, central and south Europe, Turkey and north Iran; and the extremely rare P. (P.) fortesculptus Reitter, 1897   described from Azerbaijan and occurring also in Iran ( MAZUR 2011). In fact, the type specimen of P. (P.) fortesculptus   was discovered only recently (LACKNER, unpublished). SECQ & SECQ (1991) beautifully depicted the two former species in their key to French Plegaderini. Of the three, the species from Socotra most resembles Plegaderus (P.) caesus   , which likewise possesses a string of tiny, equally distanced granules along lateral pronotal margins. The Socotran species differs, however, from P. (P.) caesus   , in its smaller size, anteriorly narrowed pronotum; less impressed punctation of the elytra, in more dilated apices of protibia, body shape more rounded; the shape of prosternum, as well as in other characters. The herein depicted specimen from Socotra ( Fig. 8 View Figs 6–12 ) most likely belongs to a new species, we are, however, reluctant to describe it based on a single female. This is the first record of the genus Plegaderus   from the Afrotropical Region, to which the Socotran Archipelago biogeographically belongs.