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The Ants of the Genus Lasius (Hymenoptera, Formicidae) from Late Eocene European Ambers
Finds of the genus Lasius Fabricius in the Baltic, Bitterfeldian, Rovno, and Scandinavian Ambers (Late Eocene) are revised. Neotypes of L. pumilus Mayr, 1868 and L. punctulatus Mayr, 1868 are designated. A key to workers and gynes of Lasius species from the Late Eocene European ambers is compiled. All Lasius species from these ambers belong to the subgenus Lasius s. str. L. schiefferdeckeri Mayr, 1868 is one of most abundant ant species in the Late Eocene European ambers: it consists 15.2-19.5% of all ant specimens in Baltic Amber, 24.5% in Bitterfeldian Amber, 23.8% in Rovno Amber, and 23.6% in Scandinavian Amber of the examined collections. Based on the features of fossilization of this species, it is possible to assume that at least in part it constructed arboreal nests and made roads to aphids' colonies. The list of nine ant species found in syninclusions with L. schiefferdeckeri is provided.
New Species of Stilbus (Coleoptera, Clavicornia, Phalacridae) from the Late Eocene Rovno Amber
The first Eocene species of Stilbus Seidlitz, 1872, S. bedovoyi Lyubarsky et Perkovsky, sp. n., is described from Late Eocene Rovno amber. S. bedovoyi is most similar to Stilbus atomarius (Linnaeus) and differs from it by smaller body size, strong and large punctation of elytra, and broadly oval apex of elytra.
The First Eocene Species of the Genus Micrambe (Coleoptera, Clavicornia, Cryptophagidae)
Based on a fossil specimen from the Late Eocene Rovno amber (Ukraine), Micrambe sarnensis Lyubarsky et Perkovsky, sp. n., the first Eocene species of this genus is described. The new species is similar to the extant Micrambe abietis (Paykull) and M. ulicis (Stephens), differing by having the callosity with an acutangular caudolateral corner.
Atomaria gedanicola Lyubarsky et Perkovsky, sp. n., a new cryptophagid species from Baltic amber is described. The new species is the first recorded Eocene Atomariinae. The new species is similar to A. fuscipes Gyllenhal. It differs from the latter in having pronotum flat, posterior angles of pronotum obtuse, and antenna short. The record of A. gedanicola syninclused with Ceratopogon biting midge supports the Late Eocene age of the Baltic amber, for the Holarctic affinities of both taxa are incompatible with the paratropical climate characteristic of the Mid-European Middle Eocene.
Based on a fossil specimen from Late Eocene Rovno amber, Latridius usovae Sergi et Perkovsky, sp. n. is described. It differs from Latridius alexeevi Bukejs, Kirejtshuk et Rucker, 2011 and L. jantaricus Borowiec, 1985 (both described from Baltic amber) by the shape of pronotum, elytra, mid and hind tibiae.
Out of 49 names of genera described from Rovno amber, 10 names (20.4 %) are related to Ukrainian toponyms. One way or another, 15.7 % of names out of 217 animal species described from Rovno amber and 67 % out of 6 described plant species are related to Ukrainian toponyms and ethnonyms. Today, only 8 out of 217 species described from Rovno amber, are known from Baltic amber. Th e ratio between Ukrainian and Baltic toponyms in the names of Rovno representatives of any given family directly depends both on the degree of exploration of a family in the corresponding faunas and floras, and on the degree of a family’s link with the ecosystem of the amber forest itself. Ant Formica paleopolonica Dlussky is recorded for Rovno amber for the first time.
Three new genera and six new species of the tribes Brachineurini and Ledomyiini from the Late Eocene Rovno amber are described: Rovnobrachineura kiryeyevi Fedotova et Perkovsky, gen. et sp. n.; Brachineura polessica Fedotova et Perkovsky, sp. n.; Popovineura nacta Fedotova et Perkovsky gen. et sp. n.; Nascensluna mellea Fedotova et Perkovsky, gen. et sp. n.; Rhizomyia parkalovi Fedotova et Perkovsky, sp. n.; Ledomyia olgae Fedotova et Perkovsky, sp. n. Th e new species of genera Brachineura and Rhizomyia are the first extinct representatives of the respective genera. Diagnoses of Ledomyia, Brachineura and Rhizomyia are updated.
Two extinct species of the modern genus Tetramorium Mayr, T. paraarmatum sp. n. and T. kulickae sp. n., are described from the Baltic amber (Poland, ca. 37 Ma). This is the first record of the fossil species of this genus. Described species resemble recent Palaearctic species, and we preliminarily place them to the inerme and caespitum species groups, respectively. Findings of other, previously non-recorded and not described yet fossil Tetramorium species from the Middle (or possibly Early) Eocene and Miocene deposits of Europe and North America are discussed.