Transactions and proceedings of the Paleontological Society of Japan. New series
Online ISSN : 2186-0963
Print ISSN : 0031-0204
ISSN-L : 0031-0204
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Volume 1981, Issue 124
Displaying 1-3 of 3 articles from this issue
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  • 737. EARLY JURASSIC PLANTS IN JAPAN. PART 3
    TATSUAKI KIMURA, MASANORI TSUJII
    1981 Volume 1981 Issue 124 Pages 187-207
    Published: December 30, 1981
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1981.124_187
    JOURNAL FREE ACCESS
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    This is the third of our serial papers on the early Jurassic plants in Japan. In this paper we describe Phlebopteris sp. A (Matoniaceae), Coniopteris neiridaniensis sp. nov. (Dicksoniaceae), Clathropteris meniscoides, Dictyophyllum kotakiense sp.nov., Thaumatopteris elongata, Hausmannia (Protorhipis) sp. A (Dipteridaceae) and the following sterile fern leaves : Cfr. Asterotheca okafujii, Cfr. Todites fukutomii, Cfr. T. yamanoiensis, Sphenopteris sp. A, Cladophlebis kurumensis sp. nov., C. pseudodelicatula, C. raciborskii, C. sp. A, C. sp. B and C. sp. C.
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  • 738. A NEW PERMIAN RADIOLARIAN GENUS FROM THE TAMBA BELT, SOUTHWEST JAPAN
    ATSUSHI TAKEMURA, KOJIRO NAKASEKO
    1981 Volume 1981 Issue 124 Pages 208-214_1
    Published: December 30, 1981
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1981.124_208
    JOURNAL FREE ACCESS
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    An Upper Permian radiolarian assemblage which includes more than 10 species has been found in the Tamba Belt, Southwest Japan. A new genus Neoalbaillella belonging to the family Albaillellidae DEFLANDRE emend. HOLDSWORTH is proposed from this assemblage. Genus Neoalbaillella is characterized by its curved apical cone, winged pseudothorax and pseudoabdomen with windows and trabeculae. 4 species (of which 2 are new) belonging to this new genus are described.
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  • 739. EARLY SHELL MORPHOLOGY IN SOME UPPER CRETACEOUS HETEROMORPH AMMONITES
    KAZUSHIGE TANABE, IKUWO OBATA, MASAO FUTAKAMI
    1981 Volume 1981 Issue 124 Pages 215-234_1
    Published: December 30, 1981
    Released on J-STAGE: May 25, 2010
    DOIhttps://doi.org/10.14825/prpsj1951.1981.124_215
    JOURNAL FREE ACCESS
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    This paper describes the early shell morphology in some Upper Cretaceous heteromorph ammonites (five nostoceratids and three diplomoceratids) on the basis of well-preserved specimens from Hokkaido. The ontogeny of the species examined may be divided essentially into the planispiral ammonitella first stage and the uncoiled or abnormally-coiled post-ammonitella second stage, both of which are bounded by a nepionic constriction. The surface ornament first appears at some phase of the second stage. These lines of evidence support the interpretation that an ammonitella was formed within an egg capsule. The three diplomoceratids are clearly distinguished from the five nostoceratids in the presence of well-marked, prorsiradiate constrictions in the earliest post-ammonitella stage. The mode of coiling of the examined species is roughly classified into the three types (planispiral, helical and repeating U-turn coiling types) by means of RAUP'S (1966) parameters. We postulate that all of the examined species might have passed a planktonic life for a limited period of the earliest post-ammonitella (=post-embryonal) stage. However, a benthonic life can be inferred as to their middle to later growth-stages, because of the loss of bilateral symmetry of the shells and other various indirect evidence.
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