Abstract
The genus Oplognathus MacLeay, 1819 is revised based on type material of two of the three described species and scattered additional material from several collections around the world. The diagnostic characters of the genus are confirmed, distinguishing it from other Brazilian Areodina mainly by: quadrangular clypeus with trilobate apex in males, rounded in females, extending beyond labrum in both sexes; mandibles with three distinct teeth; maxillae with six teeth; antenna with 10 antennomeres; 10 elytral striae; mesoventral process present; and asymmetrical parameres. The genus and all three species are redescribed, and the female of Oplognathus bahianus Ohaus, 1912 is described for the first time. We consider Oplognathus helmenreichi var. maculicollis Ohaus, 1914 an unavailable infrasubspecific taxon that is conspecific with Oplognathus helmenreichi Ohaus, 1905; its distribution is updated, and the different spelling of the specific epithet is discussed. A neotype is designated for Oplognathus kirbii MacLeay, 1819 since the holotype is currently considered lost. Additionally, an identification key and a distribution map are included.
Highlights
Areodina Burmeister, 1844 (Rutelinae, Rutelini) has 11 genera, most with a New World distribution (Grossi & Vaz-de-Mello 2015)
Oplognathus is considered a rare genus with few specimens represented in collections, and as other areodines, represented by few species: Oplognathus bahianus Ohaus, 1912, O. helmenreichi Ohaus, 1905 and O. kirbii MacLeay, 1819 (MacLeay 1819; Ohaus 1934; Blackwelder 1944; Machatschke 1972; Krajcik 2007)
Species of Oplognathus are distributed in the Brazilian Atlantic Forest, occurring from southern Bahia to northern Paraná states (Ratcliffe & Jameson 1989)
Summary
Areodina Burmeister, 1844 (Rutelinae, Rutelini) has 11 genera, most with a New World distribution (Grossi & Vaz-de-Mello 2015). Areoda MacLeay, 1819, Byrsopolis Burmeister, 1844, Moronius. CARVALHO T.G. et al, Revision of the genus Oplognathus MacLeay, 1819. Grossi & Vaz-de-Mello, 2015 and Oplognathus MacLeay, 1819 are exclusive to South America; Areoda, Moronius and Oplognathus exclusive to Brazil (Ratcliffe & Jameson 1989; Grossi & Vaz-de-Mello 2015); while Xenoproctis Kolbe, 1986 is restricted to Africa (Jameson 1990). The biology of the genus is unknown, except for the report by Grossi & Vaz-de-Mello (2015) of collecting of O. bahianus in light traps, indicating nocturnal habits
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