瑞浪市化石博物館研究報告
Online ISSN : 2435-0931
Print ISSN : 0385-0900
最新号
選択された号の論文の3件中1~3を表示しています
  • Stephen K. Donovan, Ben Dixon, Fiona E. Fearnhead
    2024 年 51 巻 1 号 p. 1-4
    発行日: 2024/05/17
    公開日: 2024/05/17
    研究報告書・技術報告書 オープンアクセス
    Identifiable crinoids are rare in the Devonian of the South Devon Basin, south-west England (UK). Hitherto, only two taxa have been described, both in open nomenclature, namely Ctenocrinus? spp. (Lower Devonian) and a twenty-armed camerate sp. indet. (Upper Devonian). A new collection, labelled ‘Lower Devonian’ and ‘unidentified crinoid stems’, is described here in slates from Trevone, near Padstow, north Cornwall. Three out of seven specimens are orthoconic nautiloids, not echinoderms. The crinoid gen. et sp. indet. is represented by pluricolumnals; there are no disarticulated ossicles, suggesting that burial was rapid. Some specimens on the largest slab are parallel, likely due to current-induced orientation. Autotomy may have released the crowns due to an environmental disturbance, leaving the columns to be buried locally.
  • Àlex Ossó, Barry W. M. van Bakel, Pedro Artal, José Luis Domínguez
    2024 年 51 巻 1 号 p. 5-14
    発行日: 2024/05/17
    公開日: 2024/05/17
    研究報告書・技術報告書 オープンアクセス
    A new species of Distefania Checchia-Rispoli, 1917, is described from the upper Cenomanian (Upper Cretaceous) Picofrentes Formation, of the Iberian Inner Castilian Platform in Guadalajara Province (Spain). Distefania buerai nov. sp. represents the third formal record of fossil decapod crustacean, and the second record for brachyuran decapods in the Cenomanian of Iberia. The paucity of crustacean remains, which contrast with the rich invertebrate faunas known in the extensive Cenomanian basins of Iberia, it may be due to the lack of favorable environments for the establishment of decapod communities in the inner Castilian Platform.
  • 天野 和孝, 稲田 陽, 佐藤 時幸
    2024 年 51 巻 1 号 p. 15-37
    発行日: 2024/05/17
    公開日: 2024/05/17
    研究報告書・技術報告書 オープンアクセス
    From the Middle to Upper Pleistocene deposits on the seabed at upper bathyal depth in the southwestern part of Japan Sea, five species of Macoma (Macoma) were recovered with some cold-water species; Macoma (Macoma) lipara Dall, 1916a, M. (M.) scarlatoi Kafanov and Lutaenko, 1997, M. (M.) golikovi Scarlato and Kafanov, 1988, M. (M.) lama meridionalis Scarlato, 1981 and M. (M.) moesta (Deshayes, 1855). All species are living in Primorye, Hokkaido and northwards. It has been elucidated that one of the characteristic species of the Omma-Manganji fauna, M. praetexta oinomikadoi Otuka, 1939 is a junior synonym of M. (M.) lipara Dall, 1919 living in Primorye via Bering Sea to California. This Macoma-dominated assemblage was deposited in the glacial stage, MIS 6 (~185–135 ka) and similar to that of the Lower Pleistocene Hamada Formation in Aomori Prefecture.
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