New tetrapodomorph vertebrates from the Yam-Tesovo locality (Amata Regional Stage, Middle–Upper Devonian) of Leningrad Region, northwestern Russia

2018 ◽  
Vol 109 (1-2) ◽  
pp. 61-73
Author(s):  
Oleg A. LEBEDEV ◽  
Gaël CLÉMENT
Keyword(s):  
Mandibular Canal ◽  
Upper Devonian ◽  
Dorsal Margin ◽  
Leningrad Region ◽  
New Taxon ◽  
Morphological Pattern ◽  
Lateral Projection ◽  
Regional Stage ◽  
Early Tetrapods ◽  
Northwestern Russia

ABSTRACTEach piece of data is valuable for unearthing the earliest history of tetrapod origin. Despite frequently incomplete preservation, each skeletal element provides important information on the morphology, phylogeny and faunistic diversity of early tetrapodomorphs. We describe here new and earlier collected material from the fossil vertebrate site Yam-Tesovo on the Oredezh River (Leningrad Region, northwestern Russia) in the deposits of the Yam-Tesovo Formation within the Amata Regional Stage (?lowermost Frasnian, Upper Devonian). Upon similarity of their dermal ornamentation, two mandibular fragments are suggested to belong to the new tetrapodomorph taxon Rubrognathuskuleshovi n. gen. et sp. This species demonstrates a general ‘elpistostegalian' morphological pattern with some early tetrapod characters. The new taxon is characterised by an almost closed intercoronoid fossa, a prearticular that is strongly convex in section and bearing small teeth along its dorsal margin, low vertical coronoid laminae and coronoid fangs that enter the coronoid tooth row. The mandibular canal runs partly in open groove or opens to the surface by a row of large pores. The dermal ornament consists of a network of small ridges forming tubercles in the nodes. The postfrontal assigned to Tetrapodomorpha shows a ‘tetrapod-like' pits-and-ridges sculpturing and a supraorbital ridge characteristic of early tetrapods as well as ‘elpistostegalians'. Its long posterolateral bone margin demonstrates a lateral projection similar to that in Tiktaalik and unknown in other ‘elpistostegalians' and early tetrapods. An unusually flattened vomer is doubtfully related to the tetrapodomorph genus Livoniana Ahlberg, Lukševičs & Mark-Kurik, 2000, based upon characteristic multiple tooth rows. Teeth in rows decrease labially and show no clearly enlarged fang pairs. New finds of the last two decades present the earliest records of some tetrapod characters in non-limbed tetrapodomorphs. This challenges previous hypotheses on the origin of tetrapods.

scholarly journals Distribution of ground beetles of the genus Bembidion (Coleoptera, Carabidae) in the agricultural landscape in Northwestern Russia

2021 ◽  
Vol 7 ◽  
pp. 227-236
Author(s):  
Olga G. Guseva ◽  
Alexander G. Koval
Keyword(s):  
Agricultural Landscape ◽  
Ground Beetles ◽  
Leningrad Region ◽  
Dense Vegetation ◽  
Field Boundaries ◽  
Northwestern Russia

We have observed seven species of predator beetles of the genus Bembidion in the agricultural landscape of the Leningrad Region (Northwestern Russia) between the years 2008 and 2018. These species reach their highest abundance in sun-exposed areas, especially mesophilic B. quadrimaculatum Linnaeus, 1761, B. properans (Stephens, 1828), B. lampros (Herbst, 1784), and B. femoratum Sturm, 1825. A few mesohygrophilic B. guttula (Fabricius, 1792) and B. gilvipes (Sturm, 1825) live primarily in areas of dense vegetation. Finally, the hygrophilic B. bruxellense (Wesmael, 1835) was only observed on the most humid soils. Assemblages of Bembidion ground beetles were separated in the fields, field boundaries, and adjacent habitats.

Fossil Organisms of the Redkino Regional Stage of the Upper Vendian of the Northwestern Russian Platform (Leningrad Region)

2021 ◽  
Vol 55 (5) ◽  
pp. 579-587
Author(s):  
E. Yu. Golubkova ◽  
I. M. Bobrovskiy ◽  
E. A. Kushim ◽  
Yu. V. Plotkina
Keyword(s):  
Russian Platform ◽  
Leningrad Region ◽  
Regional Stage ◽  
Upper Vendian

A new species of Hyattechinus (Echinoidea) from the type Devonian of the United Kingdom and implications for the distribution of Devonian proterocidarid echinoids

2018 ◽  
Vol 156 (5) ◽  
pp. 801-810 ◽  
Author(s):  
JEFFREY R. THOMPSON ◽  
TIMOTHY A. M. EWIN
Keyword(s):  
New Species ◽  
Sea Urchins ◽  
Appalachian Basin ◽  
Upper Devonian ◽  
Late Devonian ◽  
New Taxon ◽  
The North ◽  
Late Palaeozoic ◽  
Diversity Dynamics ◽  
A New Species

AbstractMany of the most diverse clades of Late Palaeozoic echinoids (sea urchins) originated in the Devonian period. Our understanding of diversity dynamics of these Late Palaeozoic clades are thus informed by new systematic descriptions of some of their earliest members. The Proterocidaridae are a diverse and morphologically distinct clade of stem group echinoids with flattened tests and enlarged adoral pore pairs, which are first known from the Upper Devonian. We herein report on a new species of Hyattechinus, Hyattechinus anglicus n. sp., from the Upper Devonian of the North Devon Basin, Devon, UK. This is the first Devonian Hyattechinus known from outside of the Appalachian Basin, USA, and provides novel information regarding the palaeogeographic and stratigraphic distribution of proterocidarids in Late Devonian times. We additionally update the stratigraphic distribution of Devonian Hyattechinus from the Appalachian Basin, following recent biostratigraphic resolution of their occurrences. Hyattechinus appears to have been present in the Rheic echinoderm fauna during Late Devonian times, and comparison of the palaeoenvironmental setting of Hyattechinus anglicus with that of other Hyattechinus from the Famennian of the Appalachian Basin suggests that the genus may have preferred siliciclastic settings. Furthermore, this new taxon increases the diversity of echinoids from the Upper Devonian of Devon to three species.

Deltaherpeton hiemstrae, a new colosteid tetrapod from the Mississippian of Iowa

2010 ◽  
Vol 84 (6) ◽  
pp. 1135-1151 ◽  
Author(s):  
John R. Bolt ◽  
R. Eric Lombard
Keyword(s):  
Lateral Line ◽  
New Taxon ◽  
Ventral Margin ◽  
Skull Roof ◽  
The Family ◽  
Early Tetrapods ◽  
Relationship Of ◽  
Dermal Bones ◽  
The Relationship

A new colosteid, Deltaherpeton hiemstrae gen. et sp. nov., is described from the Mississippian Upper Viséan site at Delta, Iowa. Deltaherpeton is represented by a skull roof and both jaws. The new taxon is unique among colosteids in having an internasal and single midline postparietal. An additional midline pair of cf. ‘interfrontonasals’ may be present. Characters previously used to define the colosteids are reviewed and a refined diagnosis for the family Colosteidae is presented. Synapomorphies which unite Deltaherpeton, Colosteus, Greererpeton, and Pholidogaster as Colosteidae are: premaxilla with fang pair; dentary with notch for receipt of premaxillary fang; mandible with single elongate exomeckelian fenestra; pre-narial infraorbital lateral line terminating at ventral margin of premaxilla just anterior to external naris; and post-narial infraorbital lateral line terminating at the ventral margin of the maxilla just posterior to the external naris. Our review of dermal bones in the colosteid snout concludes that no specimen is sufficiently free of distortions or breakage to indicate clearly whether or not the prefrontal borders the external naris, or that an anterior tectal is present. The morphology of Deltaherpeton and the revised data presented for colosteids do not clarify the relationship of colosteids to other early tetrapods.

scholarly journals Distribution of ground beetles of the genus Amara Bonelli, 1810 (Coleoptera, Carabidae) in the agrolandscape in Northwestern Russia

2019 ◽  
Vol 5 (1) ◽  
pp. 56-62
Author(s):  
O. G. Guseva ◽  
A. G. Koval
Keyword(s):  
Common Species ◽  
Ground Beetles ◽  
Phleum Pratense ◽  
Leningrad Region ◽  
Pitfall Trapping ◽  
Natural Habitats ◽  
Species Richness And Abundance ◽  
First Time ◽  
Phleum Pratense L ◽  
Northwestern Russia

The article investigates the abundance of beetles of the genus Amara in the agrolandscape of the Leningrad Region. In the period from 2004 to 2010, 14 Amara species were collected by pitfall trapping. Amara fulva (O.F. Müll.) is the most common species in the potato and clean fallow fields, Amara similata (Gyll.) – in the grain and grasses fields, and A. communis (Pz.) ˗ in adjacent semi-natural habitats respectively. The cluster analysis shows that assemblages of ground beetles of the genus Amara in fields of different crops, field boundaries, and adjacent habitats are separated from each other. In the agrolandscape, the population of beetles of the genus Amara reaches its greatest species richness and abundance in perennial grassfields. In addition, to our best knowledge, this research was a first time when Amara ingenua (Duft.) was observed feeding on the flowering spikelets of timothy grass (Phleum pratense L.).

The Stipinai Regional stage (Upper Devonian) in Petrašiūnai quarry

Geologija ◽  
2014 ◽  
Vol 56 (2) ◽  
Author(s):  
Giedrius Bičkauskas ◽  
Sigitas Radzevičius
Keyword(s):  
Upper Devonian ◽  
Regional Stage

scholarly journals Temporal evolution, petrography and composition of dolostones in the Upper Devonian Plavinas Regional Stage, southern Estonia and northern Latvia

2013 ◽  
Vol 62 (3) ◽  
pp. 139
Author(s):  
A Kleesment ◽  
K Urtson ◽  
T Kiipli ◽  
T Martma ◽  
A Põldvere ◽  
...  
Keyword(s):  
Temporal Evolution ◽  
Upper Devonian ◽  
Regional Stage

scholarly journals Frasnian age (upper devonian) key section biostratigraphic characteristic of Voronezh anteclise middle part (well 16, Schigry, Nizhnekrasnoe village, Kursky region)

2019 ◽  
Vol 27 (2) ◽  
pp. 80-106
Author(s):  
V. М. Nazarova ◽  
L. I. Kononova ◽  
T. А. Kulashova ◽  
Е. L. Zaytseva
Keyword(s):  
Middle Part ◽  
Upper Devonian ◽  
Stage Ii ◽  
Voronezh Anteclise ◽  
Regional Stage ◽  
Conodont Zonation

Conodonts, scolecodonts, and foraminifers were studied from Frasnian age deposits of Well 16 Schigry (Nizhnekrasnoe village, Voronezh anteclise). Six conodont complexes are identified: I in Timan regional stage, II and III in Sargaevo regional stage, and IV and VI in Semiluky regional stage. Correlation by local zonal units and Standard Conodont Zonation is performed. Shallow environment is confirmed for Timan regional stage, the deepest environment settings is confirmed for Semiluky regional stage. Five scolecodont complexes are identified: complexes 1 and 2 for Sargaevo regional stage, complexes 3 and 4 for Semiluky regional stage, and complex 5 for the upper part of Semiluky regional stage and Voronezh regional stage. Foraminifers are presented by two complexes: first for Sargaevo regional stage and the second for the Semiluky regional stage. The characteristic microfossils species are given in plates.

First record of Corynephorus canescens (Poaceae) in Leningrad Region and its status in Northwestern Russia

2020 ◽  
pp. 113-117
Author(s):  
A. V. Leostrin
Keyword(s):  
Natural Habitat ◽  
Perennial Grass ◽  
Local Population ◽  
First Record ◽  
Pine Forest ◽  
Leningrad Region ◽  
European Origin ◽  
Limited Distribution ◽  
Corynephorus Canescens ◽  
Northwestern Russia

Corynephorus canescens (L.) P. Beauv. is a perennial grass of European origin, having a limited distribution in Russia. Previously, it was reliably reported from five administrative regions (i. e. the Bryansk, Kaliningrad, Moscow, Pskov and Smolensk Regions). In this article, I present the first record of C. canescens in the Leningrad Region (Northwestern Russia). The local population of the species was found in a natural habitat, a dry pine forest. This is the northernmost known locality of the species in Russia so far. The residence status of C. canescens in Northwestern Russia is briefly discussed.

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