(Coleoptera: Curculionoidea) in Baltic Amber
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© Entomologica Fennica. 31 August 2016 Two new genera and four new species of fossil weevils (Coleoptera: Curculionoidea) in Baltic amber Andrei A. Legalov Legalov, A. A. 2016: Two new genera and four new species of fossil weevils (Co- leoptera: Curculionoidea) in Baltic amber. — Entomol. Fennica 27: 57–69. Two new genera, Palaeodexipeus gen. n. (type species: Palaeodexipeus kirej- tshuki sp. n.)andSuccinalophus gen. n. (type species: S. attenboroughi sp. n.), and four new species, Oxycraspedus poinari sp. n., Palaeodexipeus kirejtshuki sp. n., Dorytomus electrinus sp. n. and Succinalophus attenboroughi sp. n.,are described and illustrated. These are the first records of the tribes Oxycraspedini in the family Belidae, and Stromboscerini and Tropiphorini in Curculionidae in the Baltic amber. A. A. Legalov, Institute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, Frunze Street, 11, Novosibirsk 630091, Russia; E-mail: [email protected] Received 25 September 2015, accepted 28 October 2015 1. Introduction Germany, as well as in the Baltic and Dominican amber (Legalov 2015). Curculioinoid beetles are well represented in the In this paper, two new genera and four new fossil record (Bouchard et al. 2011, Legalov species from the Baltic amber are described. 2015), probably as a result of their solid integu- ment and ability of many groups to fly. Fossil rep- resentatives of wingless extant weevils are also 2. Materials and methods known primarily from amber. The oldest weevils are discovered in layers of the middle–late Juras- The Baltic amber mines are located along the Bal- sic of Karatau, and they represent 57 species from tic Sea coast at the Amber quarry of Yantarny 3 families (Gratshev & Legalov 2011, Legalov near Kaliningrad in the Kaliningrad Oblast (Rus- 2011, 2013b, Gratshev & Legalov 2014). The sia). The amber from this deposit was probably number of the fossil specimens and described produced by the tree pine Pinus succinifera species rapidly increases thanks to current stud- (Goeppert) Conwentz (Schubert 1961). The Bal- ies, and especially in the period between the early tic amber from this Prussian Formation dates Cretaceous and the Neogene (Legalov 2012d). back to the upper Eocene (Grigjalis et al. 1971), The superfamily Curculionoidea is the major although sometimes it is considered older, even group of Coleoptera represented in the Cenozoic the Lowermost Eocene (Weitschat & Wichard sedimentary deposit that exhibits extraordinary 2010). fossils with exceptional preservation such as The type specimens are stored in the Institute Green River and Florissant beds in USA, Aix-en- of Systematics and Ecology of Animals, the Sibe- Provance in France and Rott and Oeningen in rian Branch of the Russian Academy of Sciences 58 Legalov • ENTOMOL. FENNICA Vol. 27 (Novosibirsk, Russia). Comparative material is large, rounded, convex, 1.1 times longer than deposited in the Institute of Systematics and Eco- wide; vertex weakly flattened, punctate; temples logy of Animals, Museum für Tierkunde, short, 0.8 times as long as eye, punctate; antennae Senckenberg Naturhistorischen Sammlungen inserted at base of rostrum ventrally, non- Dresden (Germany) and the Zoological Institute geniculate, quite long, reaching first third of pro- of the Russian Academy of Sciences. notum; scape quite long, 2.4 times longer than Descriptions and photographs were taken us- wide; desmomeres almost conical; 1st desmomere ing the Zeiss Stemi 2000-C dissecting stereo- 1.6 times longer than wide, 0.6 times as long and microscope. 0.9 times as wide as scape; 2nd desmomere 2.2 The systematics of the studied taxa are given times longer than wide, 1.2 times as long and 0.8 by Legalov (2009, 2015) and Gratshev and times as wide as 1st desmomere; 3rd desmomere Legalov (2014) with corrections by Zherikhin 1.8 times longer than wide, 0.7 times as long and and Egorov (1991), Kuschel (1995a) and Ander- 0.9 times as wide as 2nd desmomere; 4th desmo- son (2002). The terminology of the names of mere equal to 3rd desmomere; 5th desmomere 1.4 body parts were used here after Klimaszewski times longer than wide, 0.9 times as long and 1.1 and Watt (1997) and Anderson (2002) with some times as wide as 4th desmomere; 6th desmomere corrections. equal to 5th desmomere; 7th desmomere 1.3 times longer than wide, 1.1 times as long and 1.2 times as wide as 6th desmomere; club noncompact, 0.6 3. Systematics times as long as flagellum; 1st club article 1.3 times longer than wide, 1.1 times as long and 1.2 3.1. Description of Oxycraspedus poinari times as wide as 7th desmomere; 2nd and 3rd club ar- sp. n. ticles fused, 2.1 times longer than wide, 2.6 times as long and 1.6 times as wide as 1st club article, Belidae Schoenherr, 1826 weakly acuminate. Oxycoryninae Schoenherr, 1840 Pronotum. Pronotum transverse, 1.4 times Oxycraspedini Marvaldi & Oberprieler, 2006 longer than apical width, 0.9 times longer than Oxycraspedus Kuschel, 1955 wide in middle and at base; disk narrowed at apex and at base, densely and quite coarsely punctate. Oxycraspedus poinari sp. n. (Fig. 1) Mesonotum. Scutellum small, rectangular. Type material. Holotype: no. BA2015/2, female. Elytra. Elytra weakly convex, slightly elon- Diagnosis. This new species is similar to O. gate, 2.3 times as long as pronotum, 1.6 times lon- cribricollis (Blanchard, 1851) from Chile and Ar- ger than wide at base, 1.4 times longer than wide gentina (Ferrer et al. 2007, Legalov 2009) but dif- in middle, 2.1 times longer than wide in apical fers in the protibiae without a fringe of long setae, quarter; greatest width behind middle; humeri a body black, a more convex form and wider pro- flattened; punctured striae quite regular and dis- notum and elytra. tinct; scutellar striole present; punctures rounded, Description. Female. Body length (without dense; intervals somewhat flat, narrow, slightly rostrum) 3.7 mm; rostrum length 1.1 mm. wider than punctures; epipleuron distinct. Body black, naked, partially appearing sil- Thorax. Prosternum punctate, with lateral very shiny due to the presence of cavities between serrulate carina; precoxal part of prosternum specimen and internal surface of its impression. weakly elongate, 1.2 times as long as procoxa Head. Head 0.4 times as long as rostrum; ros- length; procoxal cavities round, separated; trum long, narrow, almost equal in length to pro- postcoxal part of prosternum short, 0.5 times as notum, 5.2 times longer than wide at apex and in long as procoxa length; mesocoxal cavities middle, 3.4 times longer than wide at base, rounded, separated; metasternum short, 1.9 times weakly convex, finely and densely punctate; as long as metacoxa length, convex, punctate; forehead wide, 1.2 times as wide as rostrum base metepisternum narrow, densely punctate. width, flattened, densely punctate, without me- Abdomen. Abdomen weakly convex; dian striae, without tubercles on either side; eyes ventrites free; 1st ventrite 1.2 times as long as ENTOMOL. FENNICA Vol. 27 • New fossil weevil taxa in Baltic amber 59 Fig. 1. Habitus of Oxycraspedus poinari sp. n. (holo- type). – a. Dorsal view. – b. Ventral view. – c. Lateral (right) view. Scale bar = 1 mm. metacoxal length; 2nd ventrite 0.9 times as long as ical; tibiae almost straight, weakly flattened, wid- 1st ventrite; 3rd ventrite 0.9 times as long as 2nd ened at apices, with costate dorsal margin, with ventrite; 4th ventrite 0.7 times as long as 3rd weak apical setose fringe, without mucro; ventrite; 5th ventrite 1.5 times as long as 4th protibiae possessing a wide apical groove clothed ventrite. in fine, dense vestiture on the inner face opposite Legs. Legs long; femora weakly clavate and the tarsal articulation, without fringe of long flattened, without teeth; profemur length/width setae, length/width ratio 5.1; mesotibia length/ ratio 2.9; mesofemur length/width ratio 2.9; width ratio 4.0; metatibia length/width ratio 5.1; metafemur length/width ratio 2.8; trochanter con- tarsi long, with thick light erect setae dorsally; 1st 60 Legalov • ENTOMOL. FENNICA Vol. 27 tarsomere triangular, shorter than the second and 3.2. Description of Palaeodexipeus gen. n. third tarsomeres combined; 2nd and 3rd tarsomeres and a new species widely bilobed; 5th tarsomere elongate; claws large, connected, without teeth; protarsi: 1st tarso- Curculionidae Latreille, 1802 mere 0.8 times longer than wide; 2nd tarsomere Dryophthorinae Schoenherr, 1825 0.6 times longer than wide, 1.6 times as long as Stromboscerini Lacordaire, 1866 and 2.0 times as wide as 1st tarsomere; 3rd tarso- mere 1.1 times longer than wide, 2.1 times as long Palaeodexipeus gen. n. as and 1.1 times as wide as 2nd tarsomere; 5th tarso- Type species: Palaeodexipeus kirejtshuki sp. n. mere 3.6 times longer than wide, 1.1 times as long Diagnosis. This new genus is similar to the as and 0.3 times as wide as 3rd tarsomere; genus Dexipeus Pascoe, 1885 from Japan, Java mesotarsi: 1st tarsomere 0.7 times longer than and Sumatra (Alonso-Zarazaga & Lyal 1999) but wide; 2nd tarsomere 0.7 times longer than wide, differs by the unusual carinate elytral intervals, 1.8 times as long and 1.9 times as wide as 1st tarso- antennal club weakly obliquely truncate and the mere; 3rd tarsomere 0.9 times longer than wide, rostrum not widened at the antennal attachment. 1.6 times as long and 1.2 times as wide as 2nd tar- From the Oriental genus Orthosinus Motschul- somere; 5th tarsomere 2.7 times longer than wide, sky, 1863 and the genus Stenommatomorphus 1.1 times as long and 0.4 times as wide as 3rd tar- Nazarenko, 2009 from Eocene Rovno amber it somere; metatarsi: 1st tarsomere 0.8 times longer differs by the eye being much wider than high and than wide; 2nd tarsomere 0.8 times longer than the carinate elytral intervals.