Plegaderus (Plegaderus), 1834

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

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

publication LSID

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

DOI

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

persistent identifier

https://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 In fact, the type specimen of P. (P.) fortesculptus was discovered only recently (LACKNER, unpublished).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.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Histeridae

Genus

Plegaderus