Transactions and proceedings of the Paleontological Society of Japan. New series
Online ISSN : 2186-0963
Print ISSN : 0031-0204
ISSN-L : 0031-0204
Search
Advanced search
OR
Browse
Search
Volume 1979, Issue 116
Displaying 1-3 of 3 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • 708. KIDOA, EINE NEUE DIATOMEEN-GATTUNG AUS DEN OBERNEOGENEN KOITOI SCHICHTEN, TENPOKU, HOKKAIDO
    SEIICHI KOMURA
    1979 Volume 1979 Issue 116 Pages 175-178_1
    Published: December 30, 1979
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1979.116_175
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Kidoa graviarmata, n. gen., n. sp. (araphid diatom) is described from the Koitoi Formation (Upper Neogene) in the Tenpoku district, Japan.
    View full abstract
    Download PDF (1293K)
  • 709. A STUDY OF THE "PENNATAE TRIGONIIDS" FROM JAPAN
    MASAYUKI TASHIRO
    1979 Volume 1979 Issue 116 Pages 179-222_1
    Published: December 30, 1979
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1979.116_179
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The present work is a taxonomic revision of the so-called pennatae trigoniids from Japan, with an attempt to explain the evolutionary parallelism between Heterotrigonia and Apiotrigonia. 16 species belonging to the pennatae trigoniids are known from various localities of the Upper Cretaceous in Japan. They are classified into two genera (Apiotrigonia and Heterotrigonia) and four subgenera (Apiotrigonia s. str., Heterotrigonia s. str., Microtrigonia and Nakanotrigonia nov.). I propose Apiotrigoniinae nov. as a new subfamily of the Trigoniidae on these genera and subgenera together with several other genera and subgenera outside Japan, such as Columbitrigonia, ?Quoiecchia, Dampietrigonia nov. and Turkestanella nov. Apiotrigoniinae nov. is mainly composed of the Heterotrigonia trunk and the Apiotrigonia trunk which were probably derived from a common ancestor in the Lower Cretaceous. The evolutionary tempo of the Heterotrigonia trunk is more rapid than that of the Apiotrigonia trunk. Microtrigonia is an off-shoot of Apiotrigonia, whereas Nakanotrigonia nov. is that of Heterotrigonia. The apparently directional changes of characters are recognized in both trunks in parallel with each other.
    View full abstract
    Download PDF (5042K)
  • 710. SOME NEW BIVALVE SPECIES FROM THE LOWER GYEONGSANG GROUP, KOREA
    SEONG YOUNG YANG
    1979 Volume 1979 Issue 116 Pages 223-234_1
    Published: December 30, 1979
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1979.116_223
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Two new bivalvian species from the Yeonhwadong Formation, the lowermost formation of the Gyeongsang Group are described here. Trigonioides (Koreanaia) bongkyuni sp. nov. is ornamented with large angled V-shape subradial ribs of Koreanaia type and possesses fine crenulated hinge teeth of Wakinoa type. On account of the stratigraphic relation as well as the morphologic characters, T. (K.) bongkyuni is reasonably interpreted as a link-species between T. (K.) cheongi and some species of T. (Wakinoa) in the evolutionary lineage. The other new one, Pseudohyria matsumotoi, may be considered to be an ancestor of other species of Pseudohyria reported from the continental side of Asia in respect of the stratigraphic occurrences.
    View full abstract
    Download PDF (2308K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top