Sorosaccus sibiricus Prynada (Ginkgoales) from the Middle Jurassic deposits of the Irkutsk Coal Basin, Eastern Siberia

Palaeobotany ◽  
2018 ◽  
Vol 9 ◽  
pp. 5-17
Author(s):  
N. V. Nosova ◽  
N. M. Zavialova ◽  
A. I. Kiritchkova ◽  
E. I. Kostina
Keyword(s):  
Middle Jurassic ◽  
Pollen Grains ◽  
Eastern Siberia ◽  
Coal Basin ◽  
New Findings ◽  
Irkutsk Coal Basin ◽  
First Time

New findings of pollen cones of Sorosaccus sibiricus Prynada were studied in detail from the Aalenian—Bajocian Prisayan Formation of two localities in the Irkutsk coal basin (Ust’-Baley and Vladimirovka). Specimens of S. sibiricus previously described from Ust’-Baley (Heer, 1876) were reexamined. It was revealed that S. sibiricus differs from other species of Sorosaccus in a shape of the apical (free from the microsporangia) part of the microsporophylls. Microsporophylls of S. sibiricus consist of a petiole and a wide-oval distal lamina with acute apex, commonly bending upward. The lamina was often folded and became lanceolate, linear, or fan-shaped with uneven to toothed margin. Microsporangia (6—8) are oval in outline, helically attached to the petiole. Pollen grains were extracted from S. sibiricus microsporangia for the first time. They are oval to boat-shaped in outline, monosulcate and differ from other known Sorosaccus pollen grains by the verrucate surface of the exine. The diagnosis of the species Sorosaccus sibiricus is emended.

scholarly journals The first discovery leaves of angiosperms in the Middle Jurassic deposits in Eastern Siberia

2020 ◽  
Author(s):  
А.О. Frolov ◽  
◽  
I.V. Enushchenko ◽  
Keyword(s):  
Middle Jurassic ◽  
Eastern Siberia ◽  
Coal Basin ◽  
Anomocytic Stomata ◽  
Irkutsk Coal Basin

There is fossil of linear whole-marginal leaves with parallel venation in the Middle Jurassic (Aalenian) sediments of the Irkutsk Coal Basin, were found. During the study of cuticle preparations it was found that leaves were steam-bearing, has anastomoses between veins, anomocytic stomata and the diamond-shaped main cells of the epidermis. Such a combination of characters is widespread in modern monocotyledonous and is absent among fossil as well as modern sporeals and gymnosperms plants. We have every reason to believe that we have found unique structures of leaves characteristic of monocotyledons. This find is the oldest among the herbaceous angiosperms of the Jurassic period, such as Yuraherba and Yukhaniya, and the first found in Siberia.

Leafy shoots and pollen cones of conifers from the Middle Jurassic deposits of the Irkutsk Coal Basin

Palaeobotany ◽  
2017 ◽  
Vol 8 ◽  
pp. 5-27
Author(s):  
N. V. Nosova ◽  
A. I. Kiritchkova ◽  
E. I. Kostina
Keyword(s):  
Pollen Grains ◽  
Apical Part ◽  
Coal Basin ◽  
Abaxial Epidermis ◽  
Epidermal Structure ◽  
Stomatal Complexes ◽  
Leafy Shoots ◽  
Irkutsk Coal Basin ◽  
Subsidiary Cells ◽  
Pollen Cone

Among the numerous remains of the Jurassic conifers in the Irkutsk Coal Basin, several types of leafy shoots are distinguished. One type is characterized by the leaves with numerous veins. These remains were described as Podozamites irkutensis N. Nosova et Kiritch. (Nosova et al., 2017). The leaves of other types have a midvein. These leafy shoots are attributed to several taxa: Marskea sp. nov. (in press), Elatocladus falcatus (Heer) Prynada, E. heeriana N. Nosova et Kiritch., sp. nov., Elatocladus sp. and Pagiophyllum sp. Elatocladus falcatus (Heer) Prynada, 1962 (=Elatides falcata Heer, 1976) was described from the deposits of the lower subformation of the Prisayan Formation (the Aalenian) of the Ust’-Baley locality. An epidermal structure of the Elatocladus falcatus leaves is unknown. Here we designate the lectotype for E. falcatus. We have studied the leaf epidermal structure of the leafy shoots from the upper subformation of the Prisayan Formation (the Aalenian-Bajocian) in the localities Topka and Vladimirovka. Based on the morphological and epidermal features, we describe a new species Elatocladus heeriana. The shoots of E. heeriana have with helically arranged leaves. The leaves are sessile and dorsoventrally flattened, linear, lanceolate to falcate, with the tip curving toward the apex of the stem, with the broad and decurrent base and acute apex. The leaves are hypostomatic. They are characterized by straight to undulating anticlinal cell walls of the abaxial epidermis near the leaf edge and base. Stomata are arranged in two narrow bands, orientated transversely to irregularly. Subsidiary cells of the stomatal complexes are without papillae. Rare fragments of the Pagiophyllum sp. shoots were found in the deposits of the upper subformation of the Prisayan Formation (the Aalenian–Bajocian) in the localities Olkha and Vladimirovka. Their leaves are falcate, with a median keel on the abaxial side. The bad preservation of the cuticle did not allow us to study the epidermal pattern in details. Stomata are arranged in the bands, orientated irregularly. Subsidiary cells of the stomatal complexes are without papillae. One pollen cone (microstrobilus), attached presumably to the E. heeriana shoot, and several detached pollen cones of Schidolepium gracile Heer (1880) were found. The pollen cones are elongated, with numerous imbricate, helically arranged and dorsoventrally flattened microsporophylls. Sterile part of the microsporophyll expands to the distal lamina with acute apex. Some microsporophylls near the cone base are oval with rounded apex. The numerous microsporangia are visible in the apical part of the mature pollen cone, but a distal lamina of the microsporophylls often is indistinct here. Microsporangia (5–7 per microsporophyll) are elongated, fusiform. Pollen grains are spherical, nonsaccate, with the rugulate-perforate surface, apertures are invisible. The emended diagnosis is provided for the type species S. gracile, as well as the lectotype is designated.

Revision of existing classification of fossil insect feeding traces and description of new ichnotaxa from Middle Jurassic sediments of Eastern Siberia (Russia)

Zootaxa ◽  
2020 ◽  
Vol 4758 (2) ◽  
pp. 347-359
Author(s):  
ILYA V. ENUSHCHENKO ◽  
АNDREY O. FROLOV
Keyword(s):  
Middle Jurassic ◽  
Egg Laying ◽  
Zoological Nomenclature ◽  
Eastern Siberia ◽  
Fossil Plants ◽  
Insect Feeding ◽  
Fossil Insect ◽  
Formal Classification ◽  
Irkutsk Coal Basin

This paper revises the existing system of formal classification by Vialov and Vasilenko for fossil plants involving insect feeding and oviposition. The classification of these fossil traces has been amended and supplemented in accordance with the requirements of the International Code of Zoological Nomenclature. The following nomenclatural combinations are made: Insectophagichnata (Vialov) Enushchenko and Frolov, comb. et stat. (classis) nov., Phagolignichnidina (Vialov) Enushchenko and Frolov, comb. et stat. (subordo) nov., Phagophytichnidina (Vialov) Enushchenko and Frolov, comb. et stat. (subordo) nov. Fossil traces of these interactions were found and illustrated for Mesozoic insects and leafes of Ginkgo tapkensis from Middle Jurassic sediments of the Irkutsk Coal Basin in Eastern Siberia, Russia. The examined traces consist of ovipositions (traces of insect egg laying), galls (traces of insect caused teratologies) and epidermal punctures (traces of piercing and sucking). The following ichnotaxa are described and illustrated: Paleoovidinae Enushchenko and А. Frolov, ichnosubfam. nov., Paleoexoovoidinae Enushchenko and Frolov, ichnosubfam. nov., Sugophytichninae Enushchenko and А. Frolov, ichnosubfam. nov., Sugophytichnida pertusura Enushchenko and Frolov, ichnogen. et ichnospec. nov., Paleoovidus vasilenkoi Enushchenko and А. Frolov, ichnospec. nov., Paleoexoovoida ovoidea Enushchenko and А. Frolov, ichnogen. et ichnosp. nov., Paleogallus vialovi Enushchenko and Frolov, ichnospec. nov. Punctures of the leaf epidermis probably belong Mesozoic cicadas of the Palaeontini, which dominate the adjacent strata of the studied location. The extremely low occurrence of interaction between insects and plants in these Jurassic deposits of Eastern Siberia have ichnotaxonomic importance for understanding the functioning of Jurassic terrestrial paleoecosystems. 

The genus Leptotoma Kiritch. et Samyl. (Ginkgoales): systematics and characteristics of the leaf epidermal structure

Palaeobotany ◽  
2010 ◽  
Vol 1 ◽  
pp. 2-44
Author(s):  
N. V. Nosova
Keyword(s):  
Western Siberia ◽  
Type Material ◽  
Coal Basin ◽  
Type Specimens ◽  
Diagnostic Features ◽  
Epidermal Structure ◽  
New Findings ◽  
Eastern Transbaikalia ◽  
Subsidiary Cells ◽  
First Time

Diagnostic features are systematized for the leaf epidermal structure of the Leptotoma Kiritch. et Samyl. The study of the new findings and the revision of the type material of L. kryshtofovichii Srebrod. et Samyl. from the Early Cretaceous of Eastern Transbaikalia reveal the occurrence of occasional stomata on the lateral epidermis as well as the presence of a central or proximal papilla on the subsidiary cells of the stomata, which allows to emend the specific diagnosis. The same sediments yield L. baikalica N. Nosova, sp. nov., that differs considerably from other Leptotoma species in its peculiar set of epidermal characters. For the first time, discrete resin ducts are found in the leaves of Leptotoma. The revision of type specimens of L. tenuis Samyl. and L. prynadae Travina from the Middle Jurassic of Kansk-Achinsk Coal Basin (Krasnoyarsk kray) suggests their affinity to Baiera. The re-investigation of the type material of L. borealis Travina and L. sibirica Kiritch. et Batjaeva from the Jurassic of Western Siberia indicates that these species should be merged, with L. sibirica kept as the priority name. For the first time for the Lower Cretaceous, findings of Leptotoma leaves are reported from the Maastrichtian of the Amur oblast (L. samylinae N. Nosova, sp. nov.).

Provenance change in the Irkutsk coal basin during the early and middle Jurassic: Geochemical and Sm-Nd isotope evidence

2017 ◽  
Vol 25 (4) ◽  
pp. 363-384 ◽  
Author(s):  
E. A. Mikheeva ◽  
E. I. Demonterova ◽  
A. O. Frolov ◽  
A. V. Arzhannikova ◽  
S. G. Arzhannikov ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Coal Basin ◽  
Nd Isotope ◽  
Irkutsk Coal Basin ◽  
Isotope Evidence

Materials to the lichen flora of Samurskiy Ridge (high mountainous Dagestan)

2018 ◽  
Vol 52 (2) ◽  
pp. 397-406
Author(s):  
A. B. Ismailov ◽  
G. P. Urbanavichus
Keyword(s):  
North Caucasus ◽  
Lichenicolous Fungi ◽  
Greater Caucasus ◽  
Altitudinal Range ◽  
The North ◽  
New Findings ◽  
Mountainous Landscapes ◽  
First Time ◽  
Lichen Flora

The lichens and lichenicolous fungi of high mountainous landscapes of Samurskiy Ridge were studied in altitudinal range 2400–3770 m a. s. l. for the first time and 112 species are recorded. Among them 33 species, 10 genera (Arthrorhaphis, Baeomyces, Calvitimela, Epilichen, Lambiella, Psorinia, Rufoplaca, Sagedia, Sporastatia, Tremolecia) and 4 families (Anamylopsoraceae, Arthrorhaphidaceae, Baeomycetaceae, Hymeneliaceae) are new for Dagestan, six species (Buellia uberior, Carbonea atronivea, Lecanora atrosulphurea, Lecidea fuliginosa, L. swartzioidea, Rhizoplaca subdiscrepans) are reported for the first time for the Greater Caucasus and two species (Acarospora subpruinata and Rhizocarpon postumum) — for the North Caucasus. Most of the new findings were collected from 3500–3770 m a. s. l.

New and interesting lichen records for Republic of Sakha (Yakutia). III

2017 ◽  
Vol 51 ◽  
pp. 220-231 ◽  
Author(s):  
S. V. Chesnokov ◽  
L. A. Konoreva ◽  
L. N. Poryadina ◽  
A. G. Paukov ◽  
E. S. Kusnetsova ◽  
...  
Keyword(s):  
Lichen Species ◽  
Eastern Siberia ◽  
First Time

Lichen specimens collected in 2008, 2015 and 2016 in Central (Olekminsky district), Eastern (Oimyakon district) and Southern (Aldan, Neryungri districts) Yakutia were studied. As a result 16 lichen species are recorded for Yakutia for the first time, among them 8 species are new to Eastern Siberia and one species — Ramonia himelbrantii — new to Asia. At present the list of lichens of Yakutia numbers about 820 species.

Rekonstruktion des Ursprungs und Neudatierung zweier magischer Gemmen mit Hilfe einer Zauberzeichensequenz

2020 ◽  
Vol 147 (2) ◽  
pp. 153-163
Author(s):  
Kirsten Dzwiza
Keyword(s):  
Comparative Study ◽  
Fine Arts ◽  
17Th Century ◽  
The State ◽  
Roman Period ◽  
16Th Century ◽  
New Findings ◽  
State Museum ◽  
Museum Of Fine Arts ◽  
First Time

SummaryThere are only a few sequences of ancient magic signs known to us today that have been preserved on multiple artefacts. A previously unnoticed sequence of 17 signs on a gem in the Museum of Fine Arts in Vienna occurs with minor but significant variations on two other gems in the State Museum of Egyptian Art in Munich. The Viennese gem is dated to the 16th century and is documented as a drawing in a 17th century publication. The first Munich gem has been assigned to the Graeco-Roman period. The second gem, which, according to the inventory card of the museum, also belongs to the Graeco-Roman period, is published here for the first time. A comparative study of the three gems and the drawing has lead to a number of new findings, including the re-dating of the Munich gems.

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