Ecological Groups of Coleoptera (Insecta) as Indicators of Habitat Transformation on Drained and Rewetted Peatlands: A Baseline Study from a Carbon Supersite, Kaliningrad, Russia.

A total of 281 coleopteran species from 41 families were recorded from different sites of an abandoned cut-over peatland designated as the Carbon Measurement Supersite in Kaliningrad Oblast. This beetle assemblage is considered a baseline (pre-impact) faunal assemblage for further investigations during the 'before-after' (BA) or 'before-after control-impact' (BACI) study on a peatland that is planned to be rewetted. The spontaneously revegetated peatland has a less specialised beetle assemblage than at an intact raised bog. Tyrphobiontic species are completely absent from the peatland, while some tyrphophiles (5.3% of the total beetle fauna) are still found as remnants of the former raised bog communities. The predominant coenotic coleopteran group is tyrphoneutral generalists from various non-bog habitats (72.9%). The species composition is associated with the vegetation structure of the disturbed peatland (fragmentary Sphagnum cover, lack of open habitats, and widespread birch coppice or tree stand), which does not correspond to that of a typical European raised bog. The sampled coleopteran assemblage is divided into several relative ecological groups, whose composition and peculiarities are discussed separately. Possible responses to the rewetting measurements in different coleopteran groups are predicted and briefly discussed. A complex assemblage of stenotopic peatland-specialised tyrphophiles (15 spp.) and the most abundant tyrphoneutral generalists (31 spp.) were assigned as indicators for the environmental monitoring of peatland development.

First Record of the Genus Cartorhynchites Voss, 1958 (Coleoptera: Rhynchitidae) from Eocene Baltic Amber with a List of Fossil Tooth-Nosed Snout Weevils.

A new species of the genus Cartorhynchites (Rhynchitini, Rhynchitina) is described from Baltic amber. Cartorhynchites groehni Legalov, Bukejs et Alekseev sp. n. differs from C. struvei Zherikhin, 1992 from the Miocene of Germany in its smaller body size (2.6 mm), strongly convex eyes, narrower pronotum and wide elytra, and dark brown legs. A new species is studied and illustrated in detail using X-ray micro-computed tomography (µCT). It is the earliest fossil record of subtribe Rhynchitina. A list of fossil Rhynchitidae was compiled. A key to species of Rhynchitidae in Baltic amber was given. Fossil finds of the family Rhynchitidae were discussed. The assumption was made that the Recent distribution range of the genus Cartorhynchites is within the range of its host plant of the genus Symplocos. Probably, a new Eocene species developed on Symplocos kowalewskii, and the Oligocene C. struvei was associated with Symplocos myosotis (Unger).

News from Baltic amber: a new tribe of extinct Paleogene ironclad beetles (Coleoptera: Zopheridae: Zopherinae).

A new extinct monotypic genus of the ironclad beetles, Zopheromimus auriborussiensis gen. et sp. nov., is described and illustrated based on an inclusion in Baltic amber. The new Eocene fossil taxon is placed in Zopheromimini trib. nov., a new tribe within the subfamily Zopherinae, and compared with related extant beetles of the subfamily. The genus Yantaroxenos Nabozhenko, Kirejtshuk et Merkl, 2016 is transferred from the tribe Belopini (Tenebrionidae: Lagriinae) to the newly described tribe of Zopheridae.

A new fossil species and new record of Atomaria Stephens (Coleoptera: Cryptophagidae) from Eocene Baltic amber.

Based on well-preserved specimen in Eocene Baltic amber, Atomaria (Anchicera) propinqua sp. nov. is described and illustrated. It is the sixth fossil species of Atomaria Stephens, 1829 reported from fossil resins. In addition, a new fossil record of A. (Anchicera) alekseevi Lyubarsky et Bukejs, 2022 from Baltic amber is presented.

Extant genus of flat bark beetle (Coleoptera: Silvanidae) with a present-day Australian-southern South American disjunction discovered in Eocene Rovno amber.

Austronausibius aenigmatista sp. nov., the first fossil silvanid beetle belonging to the Recent genus Austronausibius Halstead distributed in Australia and southern South America, is described from late Eocene Rovno amber. The new fossil species is illustrated and compared with related extant and morphologically close extinct taxa. A key to species of fossil Silvanidae known from Eocene East European amber (Baltic and Rovno) is provided.

Eustrophus praecursor sp. nov.: the first Eocene species of Eustrophinae (Coleoptera: Tetratomidae) from Baltic amber.

Based on well-preserved specimen in Baltic amber (the Kaliningrad Region, Russia), a new polypore fungus beetle of the extant Holarctic genus Eustrophus Illiger, E. praecursor sp. nov. is described and illustrated. It is the first described Cenozoic member of the subfamily Eustrophinae. This fossil record expands the diversity of Tetratomidae known to occur in the Eocene amber forest. A checklist of described fossil Tetratomidae is provided.

The first extinct species of Monolepta Chevrolat (Coleoptera: Chrysomelidae: Galerucinae) from Bitterfeld amber, described using X-ray micro-computed tomography.

Based on a well preserved female specimen from Bitterfeld amber, Monolepta rappsilberi sp. nov. is described and illustrated using X-ray micro-computed tomography (CT). It is the second reported member of Chrysomelidae from this fossil resin and the first described fossil Monolepta representative. The fossil species represents a lineage that is extinct in Recent Europe. A longitudinal carina on abdominal ventrite 5 of the female is a unique character for the subfamily Galerucinae.

First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber.

Based on material originating from five amber collections of Eocene Baltic amber, Protostomopsis pandema gen. et sp. nov. is described and illustrated using X-ray micro-computed tomography. It is the first formally described extinct species of Cerylonidae, and the first known Palaearctic representative of the subfamily Ostomopsinae. As such, the new species extends the temporal range of the family Cerylonidae by approximately 45 Ma.

Fossil Melandryidae (Coleoptera: Tenebrionoidea) from Eocene Baltic amber of the Sambian peninsula: new genus, six new species, new records and key to described taxa.

Six new extinct representatives of the family Melandryidae, namely Electroxylita chronographica gen. et sp. nov., Madelinia capillata sp. nov., Microscapha kugelanni sp. nov., Phloiotrya inmarinata sp. nov., Symphora pollocki sp. nov., and S. glaesonauta sp. nov. are described from inclusions in Eocene Baltic amber. Twenty-eight additional fossil specimens of melandryid beetles belonging to ten species are reported. A list of Melandryidae described from Baltic amber is compiled and an identification key is provided.

The first new genus of the tribe Hypulini Seidlitz (Coleoptera: Melandryidae) described from late Eocene Baltic amber.

A new extinct monotypic genus of the false darkling beetles, Madelinia gedanoposita gen. et sp. nov., is described and illustrated based on an inclusion in Baltic amber. The new taxon from a northern European Eocene forest is compared with the morphologically similar extant beetles as well as fossil melandryid beetles found in Baltic amber. The specimen establishes that the tribe Hypulini dates back to at least the Eocene and represents the first fossil genus of the group described. The composition of the tribe is discussed, and its present-day geographic distribution is mapped.

The first described fossil species of Litargus Erichson (Coleoptera: Mycetophagidae) from Eocene Baltic amber examined with X-ray microtomography, and new records of Crowsonium succinium Abdullah, 1964.

A new species of Mycetophagidae belonging to the genus Litargus, namely L. (Litargosomus) dantiscensis Alekseev, Kupryjanowicz et Bukejs sp. nov., is described and figured from Eocene Baltic amber using X-ray micro-computed tomography (µCT). Three additional specimens of a mycetophagid beetle that is rather common in Baltic amber, Crowsonium succinium Abdullah, are also reported. Prototoma striata Heer, which was originally placed in Mycetophagidae, is discussed based on its original description and illustration: it is proposed that the position incertae sedis within Coleoptera be given to this Early Jurassic fossil. Consequently, the records of Mycetophagidae from Eocene European amber should be considered the earliest occurrence of the family known to date.

Description of the first extinct member of the tribe Anaglyptini (Coleoptera: Cerambycidae) from European Tertiary.

New longhorn beetle taxon, Acanthoglyptus picollus gen. et sp. nov., is described and figured from Baltic amber found in the Baltic Sea coast, Yantarny settlement, Kaliningrad Region, Russia. The new amber inclusions presented here prove the occurrence of the tribe Anaglyptini in the 'Baltic amber forest', giving this group at least a Palaeogene age. The closest living relative of the extinct beetle appears to be the Chinese genus Yoshiakioclytus Niisato, 2007. A brief updated list of the described longhorn beetles from European ambers, including 6 subfamilies, 17 tribes, 25 genera, and 27 species is compiled.

A new fossil Eurypinae genus and sexual dimorphism in the representatives of Omineus (Coleoptera: Mycteridae) from Tertiary amber of Europe.

Europoeurypus inglaeso gen. et sp. nov. is described from Eocene Baltic amber found on the Sambian Peninsula, Kaliningrad Region, Russia. Four additional specimens of mycterid beetles from collections of Baltic amber are reported. The secondary sexual characters and sexual dimorphism in the Eocene representatives of the genus Omineus Lewis, 1895 are documented for the first time and examined using X-ray micro-computed tomography (µCT). The studied Omineus male specimens were attributed to the fossil species Omineus febribilis Alekseev, Pollock Bukejs, 2019. A key to fossil species of Eurypinae from Eocene ambers is provided and several aspects of the biogeography of the subfamily Eurypinae are discussed.

A new fossil species of Bolitophagini (Coleoptera: Tenebrionidae) from Baltic amber suggests the genus Eledonoprius Reitter is persistent in the Western Palaearctic since the Tertiary.

The first fossil representative of Eledonoprius Reitter, E. incoronatus sp. nov., is described from Eocene Baltic amber. The genus is associated with old-growth forests in the modern Western Palaearctic Region and apparently has persistent in this Region since the Paleogene.

Two new species of Xyletinus Latreille (Ptinidae: Xyletininae) in Eocene Baltic amber.

New species of the genus Xyletinus Latreille, 1809, namely X. (s.str.) besseli sp. nov. and X. (s.str.) barsevskisi sp. nov., from Eocene Baltic amber, are described and illustrated.

Waidelotinae, a new subfamily of Pyrochroidae (Coleoptera: Tenebrionoidea) from Baltic amber of the Sambian peninsula and the interpretation of Sambian amber stratigraphy, age and location.

Waidelotus hoffeinsorum gen. et sp. nov. is described from Eocene Baltic amber and assigned to Waidelotinae subfam. nov. within family Pyrochroidae (Coleoptera). The new subfamily differs from the other subfamilies by the following combination of features: penultimate tarsomere of all tarsi deeply bilobed, antepenultimate tarsomere of each pro- and mesothoracic tarsus slightly bilobed, antepenultimate tarsomere of metathoracic tarsi slightly widened apically; pronotum laterally margined in basal half; eyes emarginate; pretarsal claws appendiculate; prosternal intercoxal process incompletely separating prothoracic coxae; pronotum with fine posterior submarginal groove; head without distinct constriction behind eyes; posterior pronotal pits absent; and elytral pubescence homogenous. It is the only authentic species of Pyrochroidae (Coleoptera) from Baltic amber, pending final placement of Palaeopyrochroa crowsoni Abdullah, 1965. Additionally, the available data on stratigraphy of amber-bearing strata on the Sambian peninsula, and the age and location of Eocene amberiferous forests are discussed. A middle Eocene (mostly Bartonian) age is interpreted for the extinct Central European resin-producing forests resulting in the Sambian amber deposits.

A new fossil species of Pycnomerus Erichson (Coleoptera: Zopheridae) from Baltic amber, and a replacement name for a Recent North American congener.

Based on a well-preserved specimen from Eocene Baltic amber, the second fossil species belonging to the genus Pycnomerus Erichson (Coleoptera: Zopheridae: Zopherinae), P. agtsteinicus Bukejs, Alekseev McKellar sp. nov. is described and illustrated using synchrotron X-ray micro-CT observations. The new species adds to the sparse fossil record of Pycnomerus, which consists of the Baltic amber discoveries, and only four subfossil records in sediments that are less than one million years old. As part of this work, the new replacement name Pycnomerus lordi Bukejs, Alekseev McKellar nom. nov. is also established for the extant species Pycnomerus sulcicollis LeConte, 1863 [non Pycnomerus sulcicollis (Germar, 1824)].

Two new fossil representatives of Eurypinae (Coleoptera: Tenebrionoidea: Mycteridae) from Eocene Baltic amber and placement of Neopolypria nigra Abdullah, 1964.

Two new species of Eurypinae (Coleoptera: Mycteridae) are described from Eocene Baltic amber from the Kaliningrad Region, Russia: Glesoconomorphus nachzehrer gen. et sp. nov. and Omineus febribilis sp. nov. The first new fossil taxon displays affinity to recent members of the Neotropical Conomorphus-Stilpnonotus lineage, and the second species was placed into the present-day eastern and southeastern Asian genus Omineus Lewis. The fossil Neopolypria nigra Abdullah, 1964 (Baltic amber) is moved from Mycteridae and placed as incertae sedis within Tenebrionoidea Latreille, 1802.

A new species of Dignomus Wollaston (Coleoptera: Ptinidae) from Eocene Baltic amber.

Dignomus francescovitalii sp. nov. is described and illustrated based on a well-preserved specimen from Eocene Baltic amber. This new extinct species is placed into D. irroratus species-group. The distribution of the genus Dignomus including fossil records is mapped.

A new extinct species of Ataenius Harold from Baltic amber (Coleoptera: Scarabaeidae: Aphodiinae).

Fossil records of Scarabaeidae in Eocene amber deposits are scarce. Previously, only three species were known from Baltic amber. Based on well-preserved specimens, an additional extinct species of Eupariini (Coleoptera: Scarabaeidae: Aphodiinae), Ataenius damzeni Bukejs Alekseev, new species is described and illustrated from this Lagerstätte. A key to the species of Scarabaeidae that have been described from European Eocene amber is provided.