The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 50 , Issue 598
Showing 1-3 articles out of 3 articles from the selected issue
  • Ken-itiro OTATUME
    1943 Volume 50 Issue 598 Pages 185-195
    Published: July 20, 1943
    Released: April 11, 2008
    JOURNALS FREE ACCESS
    Download PDF (1632K)
  • Teiichi KOBAYASHI, Asahi HUZITA
    1943 Volume 50 Issue 598 Pages 196-202
    Published: July 20, 1943
    Released: April 11, 2008
    JOURNALS FREE ACCESS
    Fossil estherids are so similar to Posidonia and a few other genera of Pelecypoda that they are easily mistaken, but when well preserved, they can readily be distinguished from the pelecypod-genera by their shell-substance, absence of hinge teeth as well as adductor scars and notably by their surface sculpture., Futhermore, BILL and WRIGHT reported the soft parts of Estheria minuta (?) and Limnestheria ardra respectively through which the conchostracan nature of the fossil esthrids was thoroughly proved., Unfortunately, however, Estheria RUPPEL, 1837, cannot be used because it is preoccupied by Estherio ROBINEAU-DESVOIDY, 1830., Likewise, Isaura JOLY, 1841, is preoccupied by Isaura SAVINGNY, 1817., When DADAY classified the living estherids into 5 families and 11 genera, Estheria dahalacensis RUPPEL, the type of Estheria, was referred to Leptestheria., There are no less than eleven fossil-genera which have been referred to the Limnadidae or Estheriidae, but Estheria is the only genus which is quite similar to living estherids, especially to caenestherids, cyzicids and leptestherids., While leptestherids generally have reticulated sculptures, cyzicids and caenestherids more commonly possess puncated or granulated ones., However neither one of these sculptures can be used for the generic distinction of the groups, and accordingly Estheria cannot be replaced by any living genus., Therefore Estherites is proposed here to be used for fossil Estheria, and Estheria mitsuishii KOBAYASHI and HUZITA, 1942, is selected for the type of Estherites.,
    Download PDF (815K)
  • Teiichi KOBAYASHI
    1943 Volume 50 Issue 598 Pages 203-206
    Published: July 20, 1943
    Released: April 11, 2008
    JOURNALS FREE ACCESS
feedback
Top