Sheltered preservation of cyrtocrinid crinoids from the Lower Cretaceous of Madagascar and their palaeogeographic significance  

作　　者：Mariusz A.Salamon Sreepat Jain Marcin Krajewski Piotr Duda Bruno Ferre Mohamed Benzaggagh Bartosz J.Plachno 

机构地区：[1]University of Silesia in Katowice,Faculty of Natural Sciences,Bedzinska 60,PL-41-200 Sosnowiec,Poland [2]Department of Geology,School of Applied Natural Science,Adama Science and Technology University,ETH-1888 Adama,Oromia,Ethiopia [3]AGH University of Science and Technology,Faculty of Geology,Geophysics and Environmental Protection,Al.A.Mickiewicza 30,PL-30-059 Krakow,Poland [4]University of Silesia in Katowice,Faculty of Science and Technology,Bedzinska Street 39,41-200 Sosnowiec,Poland [5]2 rue Guy de Maupassant,F-76800 Saint
Etienne du Rouvray,France [6]Universite Moulay Ismail,Faculte des Sciences,Departement de Geologie,BP 11.201,Zitoune,Meknes,Morocco [7]Jagiellonian University in Krakow,Faculty of Biology,Institute of Botany,Gronostajowa Street 9,PL-30-387 Cracow,Poland

出　　处：《Journal of Palaeogeography》2023年第1期69-81,共13页古地理学报（英文版）

基　　金：supported by the National Science Centre;Poland (www.ncn.gov.pl)-Grant No.2020/39/B/ST10/00006。

摘　　要：Sheltered preservation,in which organisms are trapped within shells of cephalopods,is a wellknown phenomenon.This preservational style constitutes an important source of paleontological data.Here,we report the first crinoid preserved inside the early Albian ammonite Cleoniceras besairiei Collignon from Madagascar.This crinoid is assigned to the aspidocrinid phyllocrinid(Apsidocrinus,Phyllocrinidae),and constitutes the first phyllocrinid from the African continent,the second from the southern margin of the Tethys(after New Zealand),and also from the southern hemisphere.This specimen represents the youngest occurrence of a phyllocrinid in the world as well,and constitutes one of the youngest occurrences of cyrtocrinids from shallow sea environments,before predation-induced migration of the stalked crinoids to the deep sea refugia due to the so-called Mesozoic Marine Revolution.This finding highlights that ammonite shells may also be a convenient material for studying echinoderms.

关 键 词：ECHINODERMS CRINOIDS Cyrtocrinids CRETACEOUS Madagascar AFRICA 

分 类 号：P534.53[天文地球—古生物学与地层学] Q915[天文地球—地质学]