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The late Pliensbachian (Early Jurassic) ammonoid Amaltheus in Japan: systematics and biostratigraphic and paleobiogeographic significance

Published online by Cambridge University Press:  26 May 2021

Kentaro Nakada Open the ORCID record for Kentaro Nakada [Opens in a new window] ,
Michiharu Goto ,
Christian Meister  and
Atsushi Matsuoka
Kentaro Nakada
Affiliation:
Fukui Prefectural Dinosaur Museum, 51–11 Terao, Muroko, Katsuyama, Fukui 911–8601, Japan ,
Michiharu Goto
Affiliation:
Fukui Prefectural Dinosaur Museum, 51–11 Terao, Muroko, Katsuyama, Fukui 911–8601, Japan ,
Christian Meister
Affiliation:
Department of Geology and Paleontology, Natural History Museum of the City of Geneva, 1 route de Malagnou, c.p. 6434, CH–1211, Geneva 6, Switzerland
Atsushi Matsuoka
Affiliation:
Department of Geology, Faculty of Science, Niigata University, Niigata 950–2181, Japan
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Abstract

The genus Amaltheus, one of the representative late Pliensbachian ammonoids, has biostratigraphic and paleobiogeographic significance in Japan. Four species, Amaltheus stokesi (Sowerby, 1818), A. margaritatus de Montfort, 1808, A. repressus Dagis, 1976, and A. orientalis new species, have been found in the Kuruma Group in central Japan; A. stokesi and A. margaritatus are also from the Toyora Group in southwest Japan. On the basis of taxonomic analysis of the genus Amaltheus, we distinguish two successive ammonoid biozones in the lower part of the Teradani Formation of the Kuruma Group: the Amaltheus stokesi–Amaltheus repressus and the Amaltheus margaritatus assemblage zones, in stratigraphic ascending order. This study also establishes the presence of the Amaltheus stokesi Assemblage Zone in the Higashinagano Formation of the Toyora Group. The stokesi–repressus and the stokesi assemblage zones correspond biostratigraphically to the Amaltheus stokesi Standard Subzone of the margaritatus Zone. The margaritatus Assemblage Zone is correlated with the Amaltheus subnodosus and Amaltheus gibbosus standard subzones. The Japanese early–middle late Pliensbachian ammonoid faunas are composed almost entirely of pan-Boreal and Arctic species of the genus Amaltheus. This faunal composition has an affinity with that of the Northeast Russian region, and thus suggests a strong paleobiogeographic relationship between East Asian and Northeast Russian faunas throughout this time interval.

UUID: http://zoobank.org/5F08121F-1DAF-4B24-BCBE-B08F7101CF29

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Journal of Paleontology , Volume 95 , Issue 5 , September 2021 , pp. 1004 - 1021
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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