Record details

    Eostangeria ruziciniana (Zamiaceae) from the Middle Miocene of Bulgaria and its relationship to similar taxa of fossil Eostangeria, and extant Chigua and Stangeria (Cycadales).
Statement of responsibility
    Krassimira Uzunova, Emanuel Palamarev, Zlatko Kvaček
    Kvaček, Zlatko, 1937-
    Palamarev, Emanuel
    Uzunova, Krassimira
Source title - serial
    Acta palaeobotanica
    Vol. 41, no. 2
    p. 177-193
    1 obr., 2 tab., 4 pl., 18 bibl.
    Zkr. název ser.: Acta palaeobot. (Kraków)
Subject group
Geographical name
Abstract (in english)
   Characterisation of Eostangeria ruzinciniana (Palamarev, Petkova a Uzunova) Palamarev a Uzunova (Middle Miocene - Volhynian, Bulgaria) is augmented. The species is compared with morphologically similar cycads: E. saxonica Barthel (Eocene of Germany), E. pseudopteris Z. Kvaček a Manchester (Late Palaeocene and Eocene of estern USA), and the extant Chigua D. Stevenson and Stangeria T. Moore. Leaf epidermal anatomy indicates that E. ruzinciniana is closely related to other members of Eostangeria, forming with them a natural unit. Eostangeria slightly differs from Chigua (Zamioideae) in the presence of short dark-staining cells in the lower epidermis, densely toothed margins, and in the case of Eostangeria ruzinciniana by obviously persistent, non-articulated leaflets.
   In morphological features of the leaflets, Eostangeria resembles Stangeria (Stangeriaceae); however, the latter decidedly differs in entirely cyclocytic stomata lacking ventral lignified lamellae, coarsely striated epidermis with strongly undulate anticlines and an absence of short dark-staining cells. A new subfamily Eostangerioideae is suggested to accommodate Eostangeria within Zamiaceae
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    2. 10. 2007
Import date
    8. 8. 2012