Podrobnosti záznamu

Název
    Variability of colour pattern and shell malformations in Silurian nautiloid Peismoceras Hyatt, 1884
Autor
    Manda, Štěpán
    Turek, Vojtěch
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of the National Museum (Prague). Natural History Series
Svazek/č.
    Roč. 179, č. 16
Strany
    8
Rok
    2010
Výraz tezauru
    Nautiloidea, Barrandeocerina, Peismoceras, colour pattern, shell malformation, Bohemia, Czech Republic
Klíčové slovo
    1884
    Colour
    Hyatt
    Malformations
    Nautiloid
    Pattern
    Peismoceras
    Shell
    Silurian
    Variability
Abstrakt (anglicky)
   A cephalopod Peismoceras Hyatt, 1884 from the Silurian (Gorstian) of Bohemia is the single known nautiloid genus of the suborder Barrandeocerina with a documented colour pattern. However, spiral bands on lateral side of the shell, oblique to the shell axis, illustrated by J. Barrande in 1865 in Peismoceras pulchrum and later mentioned in several papers are not typical for this species. Zigzag bands are more common and they are developed either on the entire circumference of the shell or on one lateral side, while the other side retained the above mentioned spiral bands. A marked asymmetry of colour pattern on lateral sides has been observed in several cases, but with no proven relationship to the slight dextral coiling of the shell. Densely spaced longitudinal bands preserved on ventral side of P. asperum (Barrande, 1865) are illustrated for the first time. Some unusual malformations occurring in shells of Peismoceras are discussed.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014