Bruchoptinus schatzmayeri ( Pic, 1934 )

Jerzy, Borowski & Németh, Tamás, 2024, Description of a male and redescription of a female of Bruchoptinus schatzmayeri (Pic, 1934) (Coleoptera: Ptinidae), Zootaxa 5538 (3), pp. 297-300 : 297-299

Bruchoptinus schatzmayeri ( Pic, 1934) ( Figs 1 — 6 )

Ptinus (Bruchoptinus) schatzmayeri Pic, 1934: 29

Type material. Holotype: „ Athos ( Macedonien ), A. Schatzmayer ”, female ( MNHN, M. Pic’s collection.).

Other materials: Greece, Macedonia, distr. Kavála, Pangéo Mts. , 2 km W Chortokopi , oak forest, 500 m, swept from vegetation, 6 VI 2015, leg. P. Brůha, J. Mertlik, T. Neméth & B. Zbuzek, 4 ♂♂, 3 ♀♀ ( DFP) and 10 ♂♂, 7 ♀♀ ( HNHM) ; Greece, prov. Makedonia, distr. Larissa, Mt. Ossa , 3 km SW Stomio , chestnut grove, 39°51’8.85”N, 22°44’4.61”E, 500 m, swept & singled, 9 V 2013, leg. A. Kotán, P. Nemes, Gy. Neméth, T. Neméth & V. Szénási, 2 ♀♀ ( HNHM) ; Greece, Makedonia, pref. Péla, Mt. Kaimaktsalan , 40°53’53.31”N, 21°51’54.29”E, 1550 m, beech forest, sifted, 27 VI 2012, leg. A. Kotán, A. Márkus, P. Nemes & T. Neméth, ♀ ( DFP) .

Diagnosis. The species belonging to genus Bruchoptinus occurring in the Balkans and in Turkey are extremely difficult to differentiate. Males can be classified for certain only by comparing good figures or photos of the aedeagi. In the case of the males of B. schatzmayeri a characteristic feature can be the almost parallel-sides and characteristic pubescences of the apical part of parameres, also of the strongly arched, hoop-like median lobe. Males of the commonest European species, Bruchoptinus rufipes (Olivier, 1790) have the strongly bent parameres in the middle part. The other Balkan species, B. antennatus (Pic, 1899) has glabrous parameres. Females of the new species are slightly more characteristic; the females of B schatzmayeri can be differentiated from other species by the long, strongly erect pubescence of odd interstriae and lack of setae in even interstriae. Females of all other species of the Bruchoptinus genus e.g. B. rufipes , have setae in all interstriae.

Descriptions. Male ( Fig. 1 ). Length 3.0– 4.5 mm. Antennae yellow-brown with elongated segments, slightly longer than the whole body. Eyes large, hemispherical, clearly protruding from the silhouette of the head. Frons between the eyes with golden, upstanding setae, in the posterior part with white ones and forwards directed. Disc of pronotum shining with the posterior part clearly narrowed before the base. Anterior margin of pronotum usually red-brown, rarely pronotum uniformly black-brown. Central part of pronotum with a blunt callus; sides of pronotum with a short, but clear callus. The whole surface of pronotum taken over by small tubercle, poorly visible in the basal part of the pronotum. Setae of pronotum uniform; golden and yellow-brown setae protruding strongly on the lateral calluses and grouping a pinch of cone-like setae. Scutellum large, covered with white, scall-like hair. Elytra brown-black, shining, with partially parallel sides. Humeral calluses well visible. Striae with small punctures. In interstriae setae identical to those on pronotum, clearly raised and directed towards apex of elytra. Additionally in interstriae more delicate, white-grey setae, almost adhering to elytra. Elytral bands of grey, scall-like hair indistinct. The anterior one, runs in an arch from the humerus towards the elytral suture; scall-like hair are sparsely situated there and sometimes the band seems to disappear, particularly in the central part of the elytron. The posterior one is formed by slightly more densely located scall-like hair and runs across the elytron borders towards the elytral suture, in the shape slightly similar to the letter ”M”. Apex of elytra, mouth parts and legs lighter, brown-red. Ventral side of the body dark brown. Anterior half of metasternum with deep punctures. Posterior part with a narrow, deep furrow in the middle. Aedeagus ( Fig. 3 ) with symmetrical parameres, apically pointed and with clear pubescence. Median lobe ( Fig. 4 ) strongly arched, in its apical part with protruding fragment of ejaculatory duct. Flying wings normally developed.

Female. ( Fig. 2 ). Length 2.8–3.8 mm. Antennae red-dark brown, slightly shorter than the body, with cylindrical segments. Eyes small, poorly convex, slightly protrude from head outline. Frons pubescence like in males. Pronotum in the posterior part clearly narrowed, shining, brown-red to dark brown, covered with small tubercle. Pronotum sides with short, slightly conical callus, however, usually with a blunt apex. Pronotum setae golden, on the lateral tubercle grouping a pinch of cone-like setae. The central part of pronotum with two unclear, oblong ridges; setae of ridges are slightly longer than those on lateral calluses. Scutellum large, densely covered with white, scall-like hair. Elytra oval, without visible humeral calluses, shining. The colour of elytra from dark brown-black to red-dark brown. Striae with small punctures. Pubescence in interstriae long, strongly erect. Even interstriae without setae. Setae in striae of half the length of those in interstriae, strongly leaning to elytral apices. In newly-hatched specimens two bands are clearly visible on the elytra: the anterior band, arching, running across from humerus to the elytral suture and the posterior one, similar to the letter ”M”, running from the sides to the centre and elytral suture. The bands are formed by white, scall-like hair. Legs, apart from tarsi, densely covered with grey-white, scall-like hair. Ventral side of the body from dark brown to red-dark brown. Mouth parts lighter. Ventral side of the body covered with adhering, light, scall-like hair. 4th and 5th visible ventrites, in the central part with sensory pit and setae ( Figs 5-6 ); sensory pit with setae on sternite 5 clearly larger than that on sternite 4. Hind wings absent.

Bionomy. Bionomic data on B. schatzamyeri is almost unknown. It is only known that the species was caught at the beginning of June in oak, chestnut and beech forests growing between 500 and 1550 m a.s.l. The specimens were caught by sweeping forest vegetation and sifting dead fallen leaves.

Figures

FIGURES 1–6. Bruchoptinus schatzmayeri (Pic): 1-male, 2-female, 3-aedeagus, ventral view, 4-median lobe, lateral view, 5–6 sternites of abdomen, 5-ventral view, 6-latero-ventral view; arrows show sensory pit with setae.