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Wyszukujesz frazę "Doguzhaeva, L A" wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    A rare coleoid mollusc from the Upper Jurassic of Central Russia
    Autorzy:
    Doguzhaeva, L A
    Powiązania:
    https://bibliotekanauki.pl/articles/20063.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cephalopoda
    mollusc
    Russia
    Upper Jurassic
    Kostromateuthis roemeri
    paleontology
    shell ultrastructure
    Spirulida
    Coleoidea
    Opis:
    The shell of the coleoid cephalopod mollusc Kostromateuthis roemeri gen. et sp. n. from the lower Kimmeridgian of Central Russia consists of the slowly expanding orthoconic phragmocone and aragonitic sheath with a rugged surface, a weakly developed post-alveolar part and a long, strong, probably dorsal groove. The sheath lacks concentric structure common for belemnoid rostra. It is formed by spherulites consisting of the needle-like crystallites, and is characterized by strong porosity and high content of originally organic matter. Each spherulite has a porous central part, a solid periphery and an organic cover. Tubular structures with a wall formed by the needle-like crystallites are present in the sheath. For comparison the shell ultrastructure in Recent Spirula and Sepia, as well as in the Eocene Belemnosis were studied with SEM. Based on gross morphology and sheath ultrastructure K. roemeri is tentatively assigned to Spirulida and a monotypic family Kostromateuthidae nov. is erected for it. The Mesozoic evolution of spirulids is discussed.
    Źródło:
    Acta Palaeontologica Polonica; 2000, 45, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some critical notes on “Comment on ‘Triassic coleoid beaks and other structures from the Calcareous Alps revisited’ by Doguzhaeva et al. (2022)” by Lukeneder and Lukeneder (2022)
    Autorzy:
    Doguzhaeva, L.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341367.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    critical note
    paleontology
    review
    discussion
    comment
    Triassic
    coleoid cephalopod
    cephalopod
    structure
    remains
    Alps Mountains
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 4; 966-968
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and calcification of the ammonitella shell
    Autorzy:
    Kulicki, C
    Doguzhaeva, L A
    Powiązania:
    https://bibliotekanauki.pl/articles/19971.pdf
    Data publikacji:
    1994
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fauna kopalna
    Aconeceras trautscholdi
    skamienialosci
    jura
    slimaki
    muszle larwalne
    paleontologia
    amonity
    muszle embrionalne
    Archaeogastropoda
    Aconeceras
    Opis:
    Aconeceras trautscholdi ammonitellae mass occurring in the Aptian of Symbirsk, central Russia represent consecutive calcification stages of the primary organic shell wall. Already after the formation of the organic shell with proseptum, the first whorl and umbilical walls of the initial chamber were calcified, then the remaining part of the initial chamber, and finally the nacreous primary constriction was formed and the proseptum was calcified. The original mineral participating in calcification was aragonite, which formed primary prismatic layers. The ammonite embryonic shell was thus formed similarly to the archaeogastropod larval shell. This explains the microstructural distinction of the ammonitella and proseptum walls with respect to the rest of the ammonite shell.
    Muszle embrionalne (amonitelle) Aconeceras, masowo występujace w konkrecjach aptu Syrnbirska, ukazują kolejne stadia kalcyfikacji ścianek. Pierwotna muszla amonitelli była niezmineralizowana, podobnie jak muszla larwalna dzisiejszych ślimakow Archaeogastropoda.
    Źródło:
    Acta Palaeontologica Polonica; 1994, 39, 1; 17-44
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaetognath grasping spines from the Upper Mississippian of Arkansas [USA]
    Autorzy:
    Doguzhaeva, L A
    Mutvel, H.
    Mapes, R.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/23070.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    grasping spine
    fossil
    USA
    protoconodont
    organic spine
    phosphatized fossil
    morphology
    Arkansas
    ultrastructure
    Chaetognatha
    paleontology
    chaetognath
    Opis:
    Previously unidentified tiny (about 0.5 mm in length), hollow, gently curved, serrated spines probably originally composed of horny, organic fibers from the Upper Mississippian (Middle Chesterian = Namurian A equivalent or lower Serpukhovian) of Arkansas (USA) are described, and their probable chaetognath affinities are discussed. The specimens are preserved in an oval accumulation (about 15 mm long and 6 mm wide) of approximately 200 specimens within a small (about 25 mm in length) phosphatic concretion. For comparison, the grasping spines of the Recent chaetognath Eukrohnia hamata were examined. The Arkansas specimens are named Eoserratosagitta serrata gen. et sp. nov., and this genus is assigned to the Phylum Chaetognatha. The Upper Mississippian spines are also compared with protoconodonts. This comparison supports the hypothesis that the chaetognaths may have existed in the Cambrian.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A unique late Eocene coleoid cephalopod Mississaepia from Mississippi, USA: New data on cuttlebone structure, and their phylogenetic implications
    Autorzy:
    Doguzhaeva, L.A.
    Weaver, P.G.
    Ciampaglio, C.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/23390.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    A new family, Mississaepiidae, from the Sepia–Spirula branch of decabrachian coleoids (Cephalopoda), is erected on the basis of the following, recently revealed, morphological, ultrastructural and chemical traits of the cuttlebone in the late Eocene Mississaepia, formerly referred to Belosaepiidae: (i) septa are semi−transparent, largely chitinous (as opposed to all other recorded cephalopods having non−transparent aragonitic septa); (ii) septa have a thin lamello−fibrillar nacreous covering (Sepia lacks nacre altogether, Spirula has fully lamello−fibrillar nacreous septa, ectochochleate cephalopods have columnar nacre in septa); (iii) a siphonal tube is present in early ontogeny (similar to siphonal tube development of the Danian Ceratisepia, and as opposed to complete lack of siphonal tube in Sepia and siphonal tube development through its entire ontogeny in Spirula); (iv) the lamello−fibrillar nacreous ultrastructure of septal necks (similar to septal necks in Spirula); (v) a sub−hemispherical protoconch (as opposed to the spherical protoconchs of the Danian Ceratisepia and Recent Spirula); (vi) conotheca has ventro−lateral extension in early ontogenetic stages (as opposed to Sepia that has no ventro−lateral extention of the conotheca and to Spirula that retains fully−developed phragmocone throughout its entire ontogeny). Chitinous composition of septa in Mississaepia is deduced from (i) their visual similarity to the chitinous semi−transparent flange of Sepia, (ii) angular and rounded outlines and straight compressive failures of the partial septa and mural parts of septa similar to mechanically−damaged dry rigid chitinous flange of Sepia or a gladius of squid, and (iii) organics consistent with −chitin preserved in the shell. The family Mississaepiidae may represent a unknown lineage of the Sepia–Spirula branch of coleoids, a conotheca lacking a nacreous layer being a common trait of the shell of this branch. However, Mississaepiidae is placed with reservation in Sepiida because of similarities between their gross shell morphology (a cuttlebone type of shell) and inorganic−organic composition. In Mississaepia, as in Sepia, the shell con− tains up to 6% of nitrogen by weight; phosphatised sheets within the dorsal shield may have been originally organic, like similar structures in Sepia; accumulations of pyrite in peripheral zones of aragonitic spherulites and in−between the spherulites of the dorsal shield may also indicate additional locations of organics in the shell of living animal.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triassic coleoid beaks and other structures from the Calcareous Alps revisited
    Autorzy:
    Doguzhaeva, L.A.
    Summesberger, H.
    Brandstaetter, F.
    Gruber, D.
    Tintori, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341404.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Triassic
    coleoid
    beak
    Cephalopoda
    Coleoidea
    Phragmoteuthis
    vertebrate
    invertebrate
    structure
    cephalopod
    Phragmoteuthis bisinuata
    Lunzoteuthis schindelbergensis
    Glochinomorpha stifeli
    Calcareous Alps Mountains
    Alps Mountains
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 3; 655-666
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Early Triassic gladius associated with soft tissue remains from Idaho, USA-a squid-like coleoid cephalopod at the onset of Mesozoic Era
    Autorzy:
    Doguzhaeva, L.A.
    Brayard, A.
    Goudemand, N.
    Krumenacker, L.J.
    Jenks, J.F.
    Bylund, K.G.
    Fara, E.
    Olivier, N.
    Vennin, E.
    Escarguel, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/23235.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    We describe an Olenekian (Early Triassic) “fossil squid” belonging to the oldest complex Mesozoic marine biota collected in the Lower Shale unit of the Lower Triassic Thaynes Group in Idaho, USA. The studied specimen shows a tapered structure embedded in a cylindrical soft body. Morphological, ultrastructural and geochemical features of the specimen suggest that it corresponds to an internally-shelled cephalopod exhibiting a tapered micro-laminated gladius with rachis, narrow median and lateral fields and a large conus; a pair of posterior large fin-supported cartilages and fins; ventral and dorsal mantle band-shape structures, the dorsal one being cartilaginous; mantle patches; a stomach containing undigested arm-hooks and sheet-like pieces of potential flooded ink. Coupled SEM/EDS analyses show that (i) arm-hooks and ink were pseudomorphed by nanoparticles (less than 0.6 mm in diameter) of carbon, (ii) gladius and soft tissues were substituted by granules of calcium phosphate, (iii) cartilage canalicula’s were partially filled with calcium phosphate grains and crystals of Zn- and S-containing minerals. The specimen was hence probably fossilized due to metabolism of P- and C-accumulating bacteria. Based on this specimen, Idahoteuthis parisiana Doguzhaeva and Brayard gen. et sp. nov. and Idahoteuthidae Doguzhaeva and Brayard fam. nov. are erected. This family is characterized by an elongated, cylindrical, dorsally cartilaginous muscular mantle; well-developed, about 0.2 mantle length, rounded anteriorly and acute posteriorly, fin-supported cartilages and similarly shaped two fins at conical mantle termination, and thin slender gladius with narrow median and lateral fields, rachis and breviconic conus. This family assumedly falls in Myopsida (Decabrachia). A streamlined body, large fin-supported cartilages and eroded arm-hooks in the stomach of Idahoteuthis Doguzhaeva and Brayard gen. nov. suggest that this was a maneuverable cannibal predator that dwelled in the subequatorial shallow sea of the west coast of Pangaea.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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