Updated distributional checklist of the genus Pytho Latreille, 1796 of the Palearctic realm with the first records of P.abieticola J. R. Sahlberg, 1875 from Lithuania and the family Pythidae (Coleoptera) from Moldova and Serbia.

Background: Pytho Latreille, 1796 is a small genus of the dead log bark beetles (Coleoptera, Pythidae). All species are distributed in the Holarctic, being recognised as typically boreal taxa, but knowledge about the geographical ranges of particular taxa is far from complete. New information: The updated distributional checklist of the genus Pytho of the Palearctic is given, based on literature and new records, including citizen-scientific data. Pythodepressus and the family Pythidae are recorded for the first time from the Republic of Moldova (Municipality of Chișinau) and the Republic of Serbia (Municipality of Vozdovac) and P.abieticola is recorded for the first time from Lithuania (Alytus District Municipality, Ignalina District Municipality and Kaisiadorys District Municipality).

First Report of the Larch Longhorn (Tetropium gabrieli Weise, Coleoptera: Cerambycidae: Spondylidinae) on Larix spp. in Lithuania.

Tetropium gabrieli is known to be native to the Alps in Europe where it breeds in European larch (Larix decidua), but it has spread to other areas and was reported in Poland, Sweden, Denmark and Belorussia. Although T. gabrieli is considered an important secondary pest of Larix spp., it can be particularly harmful to trees subjected to abiotic stress. Here we report that in Lithuania, T. gabrieli was for the first time captured in 2019 using sticky traps attached to Larix spp. trees. Two adult beetles were trapped at two different sites in central Lithuania, and this was in the period between 10th of May and 5th of June. Regarding potential threats caused by this insect pest, this new finding requires special attention, particularly on its biology, ecology, and local distribution.

Climatic oscillations in Quaternary have shaped the co-evolutionary patterns between the Norway spruce and its host-associated herbivore.

During the Last Glacial Maximum in the Northern Hemisphere, expanding ice sheets forced a large number of plants, including trees, to retreat from their primary distribution areas. Many host-associated herbivores migrated along with their host plants. Long-lasting geographic isolation between glacial refugia could have been led to the allopatric speciation in separated populations. Here, we have studied whether the migration history of the Norway spruce Picea abies in Quaternary has affected its host-associated herbivorous beetle-Monochamus sartor. By using microsatellite markers accompanied by the geometric morphometrics analysis of wing venation, we have revealed the clear geographic structure of M. sartor in Eurasia, encompassing two main clusters: southern (Alpine-Carpathian) and eastern (including northeastern Europe and Asia), which reflects the northern and southern ecotypes of its host. The two beetles' lineages probably diverged during the Pleniglacial (57,000-15,000 BC) when their host tree species was undergoing significant range fragmentation and experienced secondary contact during post-glacial recolonization of spruce in the Holocene. A secondary contact of divergent lineages of M. sartor has resulted in the formation of the hybrid zone in northeastern Europe. Our findings suggest that the climatic oscillations during the Pleistocene have driven an insect-plant co-evolutionary process, and have contributed to the formation of the unique biodiversity of Europe.

Faunistic review of Tetratomidae and Melandryidae (Coleoptera: Tenebrionoidea) in Lithuania with an annotated checklist of the species.

This paper presents the first faunistic review of species composition and distribution of Tetratomidae and Melandryidae (Coleoptera: Tenebrionoidea) in Lithuania. An annotated checklist of the species is given. The peculiarities of some morphological structures of Dircaea australis, Phloiotrya subtilis, Orchesia fusiformis, O. micans and Zilora cf. obscura are briefly reviewed and illustrated. Information on five species of Tetratomidae and twenty-two species of Melandryidae is given, including faunistic data, prior records, general distribution, and notes on frequency, ecology and morphological peculiarities of some species. Eustrophus dermestoides (Tetratomidae), Phloiotrya rufipes, Hypulus bifasciatus and Phryganophilus ruficollis (Melandryidae) known from previous literature records are excluded from the Lithuanian fauna due to suspect data on their occurrence in the country. Phloiotrya subtilis and Orchesia fusiformis are recorded from Lithuania for the first time. The presence of Tetratoma fungorum and Abdera flexuosa in the Lithuanian fauna was confirmed by actual faunistic data, which were previously absent. Four species of Tetratomidae and 19 species of Melandryidae are confidently included in the Lithuanian fauna, corresponding to 50% of the total European fauna of both families excluding regional endemics.

A new species of Eupariini from Eocene Baltic amber (Coleoptera: Scarabaeidae: Aphodiinae).

Based on 10 specimens from Late Eocene Baltic amber, an extinct species of Eupariini (Coleoptera: Scarabaeidae: Aphodiinae), Airapus lithuanicus Tamutis, Alekseev, & Bukejs new species, is described and illustrated. The new species is compared with two known fossil representatives of Aphodiinae from Baltic amber. The generic placement of these two species, Saprosites succini (Zang, 1905) and Ataenius europaeus Quiel, 1910, is discussed, as are details of paleoecology for the new species.

A catalogue of Lithuanian beetles (Insecta, Coleoptera).

This paper presents the first complete and updated list of all 3597 species of beetles (Insecta: Coleoptera) belonging to 92 familiesfound and published in Lithuania until 2011, with comments also provided on the main systematic and nomenclatural changes since the last monographic treatment in two volumes (Pileckis and Monsevicius 1995, 1997). The introductory section provides a general overview of the main features of the territory of Lithuania, the origins and formation of the beetle fauna and their conservation, the faunistic investigations in Lithuania to date revealing the most important stages of the faunistic research process with reference to the most prominent scientists, an overview of their work, and their contribution to Lithuanian coleopteran faunal research.Species recorded in Lithuania by some authors without reliable evidence and requiring further confirmation with new data are presented in a separate list, consisting of 183 species. For the first time, analysis of errors in works of Lithuanian authors concerning data on coleopteran fauna has been conducted and these errors have been corrected. All available published and Internet sources on beetles found in Lithuania have been considered in the current study. Over 630 literature sources on species composition of beetles, their distribution in Lithuania and neighbouring countries, and taxonomic revisions and changes are reviewed and cited. An alphabetical list of these literature sources is presented. After revision of public beetle collections in Lithuania, the authors propose to remove 43 species from the beetle species list of the country on the grounds, that they have been wrongly identified or published by mistake. For reasons of clarity, 19 previously noted but later excluded species are included in the current checklist with comments. Based on faunal data from neighbouring countries, species expected to occur in Lithuania are matnioned. In total 1390 species are attributed to this category and data on their distribution in neighbouring countries is presented. Completion of this study provides evidence that the Lithuanian coleopteran fauna has yet to be completely investigated and it is estimated that approximately 28 % of beetle species remain undiscovered in Lithuania. More than 85% of beetle species expected for Lithuania have been found in the following families: Cerylonidae, Geotrupidae, Haliplidae, Kateridae, Lycidae, Lucanidae, Mycetophagidae, Scarabaeidae and Silphidae. In families with few species such as Alexiidae, Boridae, Byturidae, Dascilidae, Drilidae, Eucinetidae, Lampyridae, Lymexilidae, Megalopodidae, Nemonychidae, Nosodendridae, Noteridae, Orsodacnidae, Pyrochroidae, Pythidae, Psephenidae, Rhysodidae, Sphaeritidae, Sphaeriusidae, Sphindidae, Stenotrahelidae and Trogidae, all possible species have already been discovered. However in some beetle families such as Aderidae, Bothrideridae, Eucnemidae, Laemoploeidae, Mordellidae, Ptiliidae, Scraptidae and Throscidae less than 50% of all possible species are known. At present the beetle species recorded in Lithuania belong to 92 families, with species from 9 other families such as Agyrtidae, Biphylidae, Deradontidae, Mycteridae, Ochodaeidae, Phleophilidae, Phloeostichidae, Prostomidae, Trachypachidae are expected to be found.A bibliography and a index of subfamily and genus levels are provided. The information published in the monograph will serve to further faunistic and distribution research of beetles and will help to avoid confusion in the identificatation of coleopteran fauna of Lithuania.