Volume 50, Nº 5 (2016)
- Ano: 2016
- Artigos: 13
- URL: https://journals.rcsi.science/0031-0301/issue/view/10144
Article
Anniversary of Alexei Yurevich Rozanov
New subfamily Petschoricinae and its position in the system of Foraminifera
Resumo
A new foraminiferal subfamily, Petschoricinae subfam. nov., with the type genus Petschorica Suchov, 2012, from the Ufimian (Upper Permian) of the Pechora Province is described. The subfamily belongs to the family Saccamminidae and differs from all other subfamilies of this family in the presence of small supplementary apertures, which are irregular in shape and scattering on the test surface. The family Saccamminidae is included in the order Saccamminida of the subclass Hormosinana Mikhalevich, 1992, class Nodosariata Mikhalevich, 1992.
Morphology, taxonomic position, and stratigraphic distribution of the early Cambrian skeletal problematics Mobergella radiolata Bengtson, 1968
Resumo
Morphology of the phosphatic sclerites of the species Mobergella radiolata that come from the Lower Cambrian sections is studied, and the stratigraphic distribution of the species is revised. The sclerite laminated microstructure of this species is described and is shown to be similar to that of some gastropods, bivalves, brachiopods, bryozoans, and corals. The species M. hexactina Skovsted, 2003 and M. sibirica Skovsted, 2003 are shown to be junior synonyms of M. radiolata based on sclerite morphology supported by the results of statistical analysis.
Revision of the superfamily Acrotheloidea (Brachiopoda, class Linguliformea, order Lingulida) from the Lower and Middle Cambrian of the Siberian Platform
Resumo
This paper continues our revision of Yu.L. Pelman’s collection of the superfamily Acrotheloidea (phosphatic brachiopods) and of our own material from the Early–Middle Cambrian of the Siberian Platform. The following representatives of the superfamily Acrotheloidea (order Lingulida, class Linguliformea) are restudied and revised based on new techniques: the genus Botsfordia (family Botsfordiidae Schindewolf, 1955) and the genera Acrothele, Eothele, and Orbithele (family Acrothelidae), which are widespread on the Siberian Platform. Only one out of the three Acrothele species described by Pelman is recognized as a valid species, and one new species of this genus that comprises some part of the brachiopods that Pelman figured and placed in another taxon is described. All these species are described using data on shell microsculpture and microstructure. In addition, the genera Eothele and Orbithele are described for the first time from the Siberian Platform.
New species of Jakutoproductus from the Lower Permian of Verkhoyansk Region
Resumo
Two new brachiopod species of Jakutoproductus, J. lenensis sp. nov. and J. talchanensis sp. nov., are described. J. lenensis occurs in the upper part of the J. verkhoyanicus Zone of the Khorokytian Horizon (Asselian–Sakmarian deposits) of the lower reaches of the Lena River and in the Sobolokh-Mayan and Allara-Khadaryn’ya river basins. J. talchanensis is identified from the Khorokytian Horizon of the Talchan River (Baraiy River basin). A new subzone, the J. lenensis Subzone, is proposed for the upper part of the J. verkhoyanicus Zone of the Khorokytian Horizon of the Verkhoyansk Region.
Paleogeography of the Ordovician bryozoans of the genus Diplotrypa Nicholson (Trepostomida)
Resumo
The stratigraphic and paleogeographic ranges of Ordovician bryozoans of the genus Diplotrypa (Trepostomida: Halloporidae) are analyzed. It is shown that they were then limited in geographic range to the Paleobaltic Basin (the most probable center of origin of the genus Diplotrypa) and to the West Arctic and North American basins. The Silurian bryozoans of this genus were represented by only a few species. In addition, the intercolonial variability of the species Diplotrypa abnormis (Modzalevskaya, 1953) and D. petropolitana (Nicholson, 1879) is studied; Upper Ordovician specimens of these species have been discovered from the Leningrad Region of Russia for the first time. The colonies of these species from the Leningrad Region are compared here with those of Podolia (Western Ukraine) and Vaygach Island (western sector of the Russian Arctic).
Caddisflies from Cenozoic resins of Europe
Resumo
Analysis of the available data on the findings and taxonomical structure of caddisflies (Insecta, Trichoptera) in the Cenozoic fossil resins of Europe shows that there are four European amber regions (Baltic, Rovno, Saxonian, and Danish) are characterized by a relatively abundant trichopteran fauna, comprising 27 families, 72 genera, and 256 species. These faunas show the dominance of Psychomyioidea (families Polycentropodidae, Psychomyiidae, and Ecnomidae) with Polycentropodidae comprising up to 75% of all records. The amber faunas are second in the dominance of Polycentropodidae only to the terminal Eocene of Florissant (84% of Polycentropodidae). No modern caddisfly species have been found. The amber regions are significantly different in the species composition of Trichoptera although the generic and family structures are similar. Comparison with the modern faunas of Europe shows the absence of advanced Limnephilidae, which are characteristic of the Holocene faunas of Europe, and the rarity of recently abundant Hydropsychidae and Hydroptilidae. The overall composition of amber Trichoptera suggests that it is structurally related to the faunas of Caucasus and Southeastern Asia and might be evidence of seasonally low-contrast (equable) climate in the Late Eocene of Europe.
A new species of the plesiosaur genus Polycotylus from the Upper Cretaceous of the southern Urals
Resumo
The most complete specimen of the plesiosaur genus Polycotylus from the Upper Cretaceous of the southern Urals is described. This specimen has much in common with the species P. latipinnis described from North America, but differs in the limb structure and cranial bones, so that it is assigned to a separate species, Polycotylus sopozkoi sp. nov.
Lizards of the family Hodzhakuliidae (Scincomorpha) from the lower Cretaceous of Mongolia
Resumo
The lizard family Hodzhakuliidae (Scincomorpha) endemic to the Early Cretaceous of Central Asia is characterized in the light of finds from the Khoobur (Höövör) locality in Mongolia. Available material includes Hodzhakulia magna Nessov, 1985 described from the Upper Albian of Uzbekistan and three new genera and species. It is proposed that Hodzhakuliidae occupied the adaptive zone of small carnivorous predators before the appearance of Platynota.
Revision of non-Passeriform birds from Polgárdi (Hungary, Late Miocene): 1. Anseriformes
Resumo
Polgárdi is a series of Late Miocene localities in central Hungary, which have yielded one of the richest Miocene avifaunas. The taxonomic composition of the waterfowl (Anseriformes) from Polgárdi is revised. As a result of revision, Anas denesi Kessler, 2013 is transferred to the genus Aythya. This species has a combination of primitive and advanced morphological characters, which do not come in conflict with the concept of gradual formation of morphological features of the modern type in various lineages of Aythya. Another small duck from Polgárdi referred to as Anas albae Jánossy, 1979 is only possible to be identified as Mergini gen. indet.
Evolution of the biome of the Middle Siberian Trappean Plateau
Resumo
The Middle Siberian volcanic plateau is characterized with respect to its paleoecological environments. In this area, volcanism commenced in the Severodvinian (Vishkilian) Age. The lower (tuffaceous) part of the plateau section (Lebedev deposits) was formed in the Vyatkian Age. Its middle (tufflava) part (Khungtukun deposits) is correlative with the Goudikeng Formation (interval of 65–111 m) in the Dalongkou type section of China and corresponds to the Quadrocladus pachyphyllus ... Echinolimnadia mattoxi Zone. The top of this sedimentary unit (111 m up from the base of the Goudikeng Formation) should be correlated with the base of the Otoceras Ecozone. The upper (lava) part of the plateau (Putorana deposits) corresponds to the interval of 111–210 m, belongs to the Elatocladus linearis ... Cornia vosini Ecozone, and is older than the Hindeodus parvus Zone, which is now considered as the basal unit of the Triassic marine sequences. The volcanic plateau section shows now evidence of any biotic crisis.
Fossil wood Ginkgoxylon amurense sp. nov. (Ginkgoaceae) from the Upper Cretaceous of the Amur River area, Russian Far East
Resumo
A new species, Ginkgoxylon amurense (Ginkgoaceae) from the Upper Cretaceous (middle Maastrichtian) of the Amur River area (Russian Far East) is described on the basis of fossil wood anatomy. Ginkgoalen fossil wood is found in Russia for the first time.