Glaesotropis (Electranthribus) rohdendorfi, Legalov & Nazarenko & Perkovsky, 2021

Legalov, Andrei A., Nazarenko, Vitaliy Y. & Perkovsky, Evgeny E., 2021, A new species of the genus Glaesotropis Gratshev and Zherikhin, 1995 (Coleoptera, Anthribidae) from Rovno amber, Fossil Record 24 (1), pp. 1-7 : 2-4

Glaesotropis (Electranthribus) rohdendorfi sp. nov.

urn:lsid:zoobank.org:act:67C876B0-5DEB-481A-83B3-9F6889BD4267

Figs. 1–3 .

Etymology

It is named in honour of the great palaeoentomologist Boris B. Rohdendorf, who determined the first Zhytomyr inclusion to family level ( Rhagionidae ).

Type material

Holotype SIZK OL-269 . The amber sample with inclusion is deposited in the amber collection of Schmalhausen Institute of Zoology of the National Academy of Sciences of Ukraine, Kiev ( SIZK). Syninclusions (samples SIZK OL-259 – SIZK OL-269): numerous stellate hairs, 2 dipterans ( Chironomidae and Sciaroidea), and 44 mites. Mites represented by 41 Glaesacarus rhombeus ( Koch and Berendt, 1854) , 2 Oribatei, and undetermined mite.

Type stratum: Rovno amber, Priabonian

Type locality: Olevsk, Zhytomyr region, Ukraine

Description

Size: body length (without rostrum) 3.05 mm, rostrum length 0.46 mm.

Body: black, covered with sparse, light appressed hairs.

Head: rostrum short, almost straight, 0.6 times as long as pronotum, 0.55 times as long as wide at apex, 0.5 times as long as wide in middle, 0.53 times as long as wide at base, densely punctate, flattened, without middle carina. Mandibles large. Labrum free. Forehead 0.7 times as long as wide at rostrum base, 2.0 times as wide as longitudinal eye diameter, weakly flattened, densely punctate. Eyes large, rounded, convex, finely faceted. Temples very short. Vertex slightly convex, densely punctate. Antennae straight and long, inserted laterally in basal third of rostrum. Scape 1.9 times as long as wide. Antennomeres: (2)–(8) conical; 2–1.4 times as long as wide, 1.2 times as long as and 1.6 times as wide as scape; (3) 1.6 times as long as wide, 0.8 times as long as and 0.7 times as narrow as antennomere 2; (4)– (6) subequal in wide; (4) 1.4 times as long as wide, 0.8 times as long as and 0.8 times as narrow as antennomere 3; (5) 1.3 times as long as wide, slightly narrower than antennomere 4; (6) 1.5 times as long as wide, 1.1 times as long as antennomere 5; (7) 1.3 times as long as wide, 0.9 times as long as and slightly wider than antennomere 6; (8) 1.2 times as long as wide, 0.9 times as long as and slightly wider than antennomere 7; antennal club distinct, loose, 0.6 times as long as antennomeres 2–8 combined; (9) 0.7 times as long as wide, 1.3 times as long as and 2.4 times as wide as antennomere 8; (10) 0.5 times as long as wide, 0.8 times as long as and 1.1 times as wide as antennomere 9; (11) 1.1 times as long as wide, 1.8 times as long as and 0.8 times as narrow as antennomere 10.

Pronotum: weakly bell-shaped, width subequal at apex, 0.9 times as long as wide in middle and at base, coarsely punctate, slightly convex. Transverse carina subbasal, angularly extended to scutellum. Lateral carina absent. Posterior angular carina complete. Pronotal declivity about 0.1 times as long as pronotum.

Mesonotum: scutellum small, almost triangular.

Elytra: quite wide, 1.9 times as long as pronotum, 1.3 times as long as wide at base and in apical quarter, 1.1 times as long as wide in middle. Humeri weakly smoothed. Striae shallow. Interstriae convex, finely punctate.

Thorax: prosternum coarsely punctate. Precoxal part of prosternum equal to procoxa length. Procoxal cavities rounded, separated. Postcoxal part of prosternum 0.7 times as long as procoxa length. Mesocoxal cavities rounded and separated. Metaventrite 1.1 times as long as length of mesocoxa, flattened, densely punctate. Metepisternum 5.0 times as long as wide in middle. Metacoxal cavities dilated.

Abdomen: convex, weakly flattened in middle. Abdominal ventrites 1–4 fused. Ventrite 1, 0.7 times as long as metacoxae. Ventrite 2, 1.4 times as long as ventrite 1. Ventrite 3, 1.1 times as long as ventrite 2. Ventrite 4, 0.8 times as long as ventrite 3. Ventrite 5, 1.5 times as long as ventrite 4. Pygidium exposed.

Legs: long. Procoxae spherical. Femora clavate, without tooth. Profemora 2.4 times as long as wide in middle. Mesofemora 2.8 times as long as wide. Metafemora 3.0 times as long as wide. Tibiae almost straight, weakly flattened, without mucro. Protibia 5.6 times as long as wide in middle. Mesotibia about 6.3 times as long as wide in middle. Metatibia 5.3 times as long as wide in middle. Tarsi elongate, shorter than tibiae, with pulvilli ventrally. Tarsomeres: (1) elongate, conical; (2) wide, conical, bilobed, covers base of tarsomere 3; (3) bilobed, narrower than second; (5) elongate. Claws large, diverging, free, with teeth. Protarsomeres: (1) 2.1 times as long as wide; (2) 1.4 times as long as wide, 0.9 times as long as and 1.3 times as wide as tarsomere 1; (3) 1.2 times as long as wide, 0.5 times as long as and 0.6 times as narrow as tarsomere 2; (5) 3.5 times as long as wide, 2.7 times as long as and 0.9 times as narrow as tarsomere 3.

Comparison

The new species is most similar to the largest species of the subgenus, Glaesotropis (Electranthribus) zherikhini ( Legalov, 2013a) by their shared complete posterior angular carinula and precoxal part of prosternum subequal in length of the procoxa. It differs in its transverse carina extended to the scutellum, the shorter antennomere 2 (1.3 times as long as antennomere 3), wider antennal club (length 2.0 times maximum width), more convex eyes, and its larger body size. The species differs from G. (Glaesotropis) diadiasashai Gratshev and Perkovsky, 2008 ( Fig. 4 ) from Rovno amber by its smaller body size, antennomere 3 distinctly narrower and shorter than antennomere 2, shorter rostrum, and the transverse carina extended to the scutellum.

Remarks

Tarsomere 2 covers the base of tarsomere 3, the labrum is free, the pygidium is exposed, the antennae are straight, and the tibiae lack spurs, suggesting placement of the new species in the family Anthribidae . The antennae are inserted laterally, abdominal ventrites 1–4 are fused and the elytra striate suggest that it belongs to the subfamily Anthribinae . Placement of this species in the tribe Zygaenodini is based on the rostrum being shorter than its width, and the eyes being finely faceted. Its strongly convex eyes, wide antennal club, and transverse carina quite distant from base of the pronotum indicate that the new species belongs to the genus Glaesotropis . It belongs to the subgenus Electranthribus based on its forehead being wider than its longitudinal eye diameter, and antennomere 3 being distinctly narrower and shorter than antennomere 2.

Figures

Figure 1. Glaesotropis rohdendorfi sp. nov., holotype. SIZK OL- 269, rostrum and head, dorsally. Scale bar 0.2 mm.

Figure 2. Glaesotropis rohdendorfi sp. nov., holotype. SIZK OL- 269, body, dorsally. Scale bar 1.0 mm.

Figure 3. Glaesotropis rohdendorfi sp. nov., holotype. SIZK OL- 269, body, laterally. Scale bar 1.0 mm.

Figure 4. Glaesotropis diadiasashai Gratshev and Perkovsky, 2008, holotype. SIZK UA-2223, body, laterally. Scale bar 0.5 mm.