Record details

    Kirkocystid ankyroids (Stylophora: Echinodermata) from the Šárka Formation (Ordovician) of Bohemia
Statement of responsibility
    Ronald L. Parsley, Rudolf J. Prokop, Kraig Derstler
Other titles
    Kirkocystidní ankyroidi (Stylophora: Echinodermata) ze šáreckého souvrství českého ordoviku
    Derstler, Kraig
    Parsley, Ronald L.
    Prokop, Rudolf J.
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
    Vol. 75, no. 1
    s. 37-47
    1 obr., 2 pl.
    České resumé
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    morfologie funkční
    nový taxon
    pražská pánev
Geographical name
Abstract (in english)
   Kirkocystids were originally described as the cirriped genus Anatifopsis Barrande, 1872. Now recognized as stylophoran echinoderms, kirkocystid from the Llanvirn age Šárka Formation are represented by two monospecific genera: Anatifopsis (=Anatiferocystis Chauvel, 1941) bohemica Barrande, 1872 and Sagittacystis gen.nov. (=Balanocytsites Barrande, 1887) prima (=Anatifopsis prima Barrande, 1872). During Arenigian, kirkocystids probably evolved from Peltocystis-like ancestors in the relatively dysaerobic Prague Basin which seems to be the centre for dispersal for subsequent representatives found in the Western United States. The kirkocystid theca has been reduced to six plates, dominated by the paired adorals, but within the subclade the aulacophore has remained conservative and primitive. Like in most ankyroids kirkocystid thecae are flexible, but quite exceptionally, they could apparently expand and contracts along dorsal and ventral sutures of the righ adoral.
   Juvenile specimens indicate that ontogenetic development accentuates plate growth towards the thecal posterior
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    5. 4. 2007
Import date
    8. 8. 2012