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The Khasurty locality (Lower Cretaceous of Transbaikalia, Russia) is one of the largest fossil insect sites in the region. Over the entire period of study, more than 6000 insect imprints have been collected here, representing 16 orders and 130 families. Dipterans, aphids and hymenopterans are the most common forms here, the most diverse taxa are Diptera, Hymenoptera, Coleoptera and Trichoptera. In addition to insects, remains of crustaceans, mosses, liverworts and vascular plants were found in Khasurty, as well as occasional finds of arachnids, bird feathers and fish scales. Two new families, 17 new genera and 21 new species of Trichoptera, two new species of Orthoptera, one new genus and species of Phasmatoptera, one new species of Reculida, three new genera and species of Hemiptera, a new genus and species of Thysanoptera, a new genus and species of Hymenoptera, a new subfamily, two new genera and six new species of Lepidoptera, three new genera and four new species of Neuroptera, as well as a new genus and species of liverworts are described. In terms of the composition of the fauna and flora, the Khasurty locality is very peculiar, it includes both Jurassic and Cretaceous taxa, but in general it can be attributed to the Jehol biota.
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... The Khasurty fossil site (Buryatia Republic, Russia: 50 21 00 N, 103 38 0 E) is represented by sandstones, clays and aleurolitic deposits of the lower subunit of the Sanga suite of the Gusinoozersk series, assigned to the Lower Cretaceous, Hauterivian (Kopylov et al., 2020). Structurally, the fossil site is confined to the marginal part of the Dzhidinsky synclinorium of the Altai-Sayan folded region, which took shape at the Early Paleozoic stage of folding. ...
... The specimens described here were found in the lake-origin pack. Detail characteristics of the locality, including stratigraphic profile, age estimation and paleontological and paleoenvironmental implications are available in Kopylov et al. (2020). ...
... The Khasurty locality demonstrates great diversity of the beetle families from suborders Archostemata, Adephaga and Polyphaga. Archostemata are few in number of fossils and represented by the family Ommatidae and controversial Jurodidae, making 4% all beetles, as well as in the most part of Mesozoic localities, particulary in late Mesozoic (Strelnikova, 2019;Kopylov et al., 2020). In the articles mentioned Ommatidae are named as a subfamily of Cupedidae sensu Ponomarenko (1969). ...
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Ponohydrochus buryaticus gen. et sp. nov. is described from from the Khasurty fossil site, Lower Cretaceous, Hauterivian, at the Buryatia Republic, Russia. The new taxon is assigned to the family Hydrochidae and represents its first remarkable fossil in the Mesozoic. The description is illustrated by photographs, scanning electron micrographs and line drawings. The genus Cretohelophorus Ponomarenko, considered as possibly representing the Hydrochidae by some recent authors, is for the moment excluded from the family; detailed studies of both its species are needed to reveal its family placement.
... Recent studies, based on UePb dating suggest an age comprised between 120 and 130 Ma and consider the Yixian Formation as Lower Cretaceous, BarremianeAptian age (Chen et al., 2015). The position of the biota of the Yixian Formation within the Jehol Biota, to which it belongs, is discussed by Rasnitsyn (2020). ...
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Three new species, Brachyoxyela conjunctiva sp. nov., Brachyoxyela leei sp. nov. and Brachyoxyela elliptica sp. nov., in the tribe Macroxyelini, subfamily Macroxyelinae of the family Xyelidae, are described and illustrated. All type specimens were collected from the Lower Cretaceous (Barremian–Aptian) Yixian Formation. Brachyoxyela conjunctiva sp. nov. and Brachyoxyela leei sp. nov. were from Huangbanjigou, Beipiao City, Liaoning Province, China, and Brachyoxyela elliptica sp. nov. from Sandaogou, Duolun County, Inner Mongolia, China. These specimens are assigned to a previously erected genus Brachyoxyela Gao, Zhao and Ren, 2011 based on the characters: vein Sc joining R distad origin of Rs and antenna with thread (terminal part of flagellum distal to the enlarged first flagellomere) longer than the first flagellomere. A key to species of Brachyoxyela is provided.
... Nowadays, the academic community generally supports the results of radioactive geochronological dating method, considering the Yixian Formation as the Early Cretaceous, Barremian-Aptian age [32,33]. The position of biota of the Yixian Formation within the Jehol Biota, which it belongs to, is discussed by Rasnitsyn (2020) [34]. Up to date, there are 5 species of Macroxyelinae reported from Daohugou, and 14 species from Huangbanjigou [35]. ...
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One new genus and species, Leptoxyela eximia gen. et sp. nov., and one new species, Scleroxyela cephalota sp. nov., are described and illustrated based on two well-preserved compression fossils from the Lower Cretaceous Yixian Formation and the Middle Jurassic Jiulongshan Formation of China, respectively. Leptoxyela eximia gen. et sp. nov. is placed in the tribe Angaridyelini, 1966 and Scleroxyela cephalota sp. nov. in the tribe Xyeleciini Benson, 1945; while both tribes are in the subfamily Macroxyelinae Ashmead, 1898 of Xyelidae. A key to the genera of Angaridyelini is provided. In addition, we investigated various angles between Rs+M and 1-Rs for known fossil species of Macroxyelinae, and we found the angle and the length of 1-Rs are correlated; however, we could not see any correlation between the angles and the fossil ages even within a tribe. Furthermore, based on Sc2 connected to R before Rs, the angle between Rs+M and 1-Rs, and the length of the first flagellomere, we believe that the tribe Ceroxyelini may have only one genus of Ceroxyela, and suggest that Isoxyela and Sinoxyela should be transferred to Gigantoxyelini.
... Nevertheless, the vespids seem to be already well diversified during the Cretaceous since they are nearly distributed worldwide (Botswana, USA, Kazakhstan, South Africa, Russian Federation, Mongolia, and Myanmar). This vespid fossil record seems to corroborate the estimated age of origin of the family with the earliest evidences known from the Aptian period in the Zaza Formation and the Dzun-Bain Formation (now called Khurilt Formation; Kopylov et al. 2020), respectively from Russia and Mongolia (Carpenter & Rasnitsyn 1990). ...
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The first vespid species from the Lower Cretaceous Crato formation (Brazil) is described and figured as Curiosivespa sennlaubi Jouault, Rasnitsyn & Nel, n. sp. This new species can be differentiated from the other Curiosivespa species, inter alia, by its forewing venation (e.g. Rs+M and 2-M aligned; 2 m-cu meeting M slightly prior to 2 r-m). This first occurrence of the family Vespidae in South America during the Cretaceous indicates that the family was widely distributed during this period.
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... The records of Glossata become more numerous and reliable since the Early Cretaceous. Members of the basal family Eriocraniidae, with elongate galeae not coupled into a common proboscis, were described from the Lower Cretaceous of Transbaikalia (Kopylov et al., 2020). An undescribed larva of Glossata was found in Lebanese amber (Grimaldi, 1999: fig. ...
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