Adexius Schönherr, 1834

Hlaváč, Peter, 2020, Review of the tribe Typoderini (Coleoptera: Curculionidae) from Caucasus with the description of a new species of Caulomorphus from Armenia, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 629-638 : 631-632

Adexius Schönherr, 1834

( Figs 1a , 2a–e , 3a–h )

Adexius Schönherr, 1834: 366 (original description).Rൾංඍඍൾඋ (1913): 53

(key); Aඅඈඇඌඈ-ZൺඋൺඓൺǤൺ & Lඒൺඅ (1999): 195 (catalogue); Aඅඈඇ-

ඌඈ-ZൺඋൺඓൺǤൺ (2013): 488 (catalogue); Aඅඈඇඌඈ-ZൺඋൺඓൺǤൺ (2017):

480 (catalogue).

Type species. Adexius scrobipennis Gyllenhal, 1834 by original designation.

Diagnosis. Body oval ( Fig. 1a ), length 2.2–3.2 mm, elytra and pronotum with erect, sparse setae on whole surface, head shorter than pronotum. Eyes large, oval, clearly visible in dorsal view, situated at base of rostrum and on head. Rostrum carinate, densely punctate, scrobes visible dorsally. Antennae stout, scape short, not reaching anterior margin of eyes, funicule with 7 antennomeres separated, ventrite I and II separated by suture, ventrite I considerably longer than II ( Fig. 2b ). Legs stout ( Figs 3a–c male, 3d–f female), tarsomere III strongly bilobed, onychium short, less than twice as long as tarsomeres II and III combined. Male terminalia: median lobe of aedeagus ( Figs 3g –h ) symmetrical, lacking internal sclerites, parameres well-developed, male sternite IX ( Fig. 2e ), hemisternite slender, subtriangular. Female terminalia: spermatheca ( Fig. 2d ), sternite VIII cradle-like ( Fig. 2c ).

Remarks. Adexius is a monotypic genus, currently classified in the tribe Molytini , subtribe Plinthina . The genus is here transferred to Typoderini based on the general appearance, the position of eyes and similar sexual dimorphism of tibiae. All reports of Adexius corcyreus Reitter, 1884 from Greece (Kerkyra) in recent catalogues (Aඅඈඇඌඈ-ZൺඋൺඓൺǤൺ 2013, Aඅඈඇඌඈ-ZൺඋൺඓൺǤൺ et al. 2017) are erroneous and refer to Styphlidius corcyreus Reitter, 1884 of the subfamily Curculioninae . Adexius scrobipennis is widely distributed in central and southern Europe; it is also reported from Russian south European territory (Aඅඈඇඌඈ-ZൺඋൺඓൺǤൺ et al. 2017), therefore its presence in the northern part of Caucasus Region is possible but it needs confirmation.

Distribution. Austria, Belgium, Bosnia and Herzegovina, Croatia, Czech Republic, France, Germany, Hungary, Italy, Luxembourg, Poland, Romania, Russia (central and southern territory), Slovakia, Slovenia, Spain, Switzerland, and Ukraine.

Figures

Fig. 1. Dorsal habitus. a – Adexius scrobipennis Gyllenhal, 1834; b – Anchonidium caucasicum Motschulsky, 1845; c – Caulomorphus kociani sp. nov.; d – Anchonidium perpensum Faust, 1886; e – Aparopion costatum (Fåhraeus, 1843); f – Pseudaparopion kadleci Borovec, Osella & Zuppa, 2002.

Fig. 2. Adexius scrobipennis Gyllenhal, 1834: a – antenna; b – abdominal ventrites I–V; c – sternite VIII; d – spermatheca; e – sternite IX and hemisternites. Scale bars: 0.2 mm.

Fig. 3. Adexius scrobipennis Gyllenhal, 1834: a – left foreleg, male; b – left midleg, male; c – left hindleg, male; d – left foreleg, female; e – left midleg, female; f – left hindleg, female; g – aedeagus, dorsal view; h – aedeagus, lateral view. Scale bars: 0.2 mm.