The early evolutionary history of belemnites: new data from Japan.

Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated the world's oceans throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest belemnites are known from the lowermost Jurassic (Hettangian, 201-199 Ma) of...

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Autores principales:	Yasuhiro Iba, Shin-ichi Sano, Jörg Mutterlose
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/91fc6ed8d83747448ce77395e6136acb
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id	oai:doaj.org-article:91fc6ed8d83747448ce77395e6136acb
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spelling	oai:doaj.org-article:91fc6ed8d83747448ce77395e6136acb2021-11-18T08:21:05ZThe early evolutionary history of belemnites: new data from Japan.1932-620310.1371/journal.pone.0095632https://doaj.org/article/91fc6ed8d83747448ce77395e6136acb2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24788872/?tool=EBIhttps://doaj.org/toc/1932-6203Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated the world's oceans throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest belemnites are known from the lowermost Jurassic (Hettangian, 201-199 Ma) of northern Europe. They are of low diversity and have small sized rostra without clear grooves. Their distribution is restricted to this area until the Pliensbachian (191-183 Ma). Here we describe two new belemnite taxa of the Suborder Belemnitina from the Sinemurian (199-191 Ma) of Japan: Nipponoteuthis katana gen et sp. nov., which represents the new family Nipponoteuthidae, and Eocylindroteuthis (?) yokoyamai sp. nov. This is the first reliable report of Sinemurian belemnites outside of Europe and the earliest record of typical forms of Belemnitina in the world. The Sinemurian belemnites from Japan have small to large rostra with one deep and long apical groove. Morphologically these forms are completely different from coeval European genera of Hettangian-Sinemurian age. These new findings suggest that three groups of Belemnitina existed in the Hettangian-Sinemurian: 1) European small forms, 2) Japanese very large forms, and 3) the typical forms with a distinctive apical groove, reported here. The Suborder Belemnitina therefore did not necessarily originate in the Hettangian of northern Europe. The new material from Japan documents that the suborder Belemnitina had a much higher diversity in the early Jurassic than previously thought, and it also shows strong endemisms from the Sinemurian onwards.Yasuhiro IbaShin-ichi SanoJörg MutterlosePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 5, p e95632 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yasuhiro Iba Shin-ichi Sano Jörg Mutterlose The early evolutionary history of belemnites: new data from Japan.
description	Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated the world's oceans throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest belemnites are known from the lowermost Jurassic (Hettangian, 201-199 Ma) of northern Europe. They are of low diversity and have small sized rostra without clear grooves. Their distribution is restricted to this area until the Pliensbachian (191-183 Ma). Here we describe two new belemnite taxa of the Suborder Belemnitina from the Sinemurian (199-191 Ma) of Japan: Nipponoteuthis katana gen et sp. nov., which represents the new family Nipponoteuthidae, and Eocylindroteuthis (?) yokoyamai sp. nov. This is the first reliable report of Sinemurian belemnites outside of Europe and the earliest record of typical forms of Belemnitina in the world. The Sinemurian belemnites from Japan have small to large rostra with one deep and long apical groove. Morphologically these forms are completely different from coeval European genera of Hettangian-Sinemurian age. These new findings suggest that three groups of Belemnitina existed in the Hettangian-Sinemurian: 1) European small forms, 2) Japanese very large forms, and 3) the typical forms with a distinctive apical groove, reported here. The Suborder Belemnitina therefore did not necessarily originate in the Hettangian of northern Europe. The new material from Japan documents that the suborder Belemnitina had a much higher diversity in the early Jurassic than previously thought, and it also shows strong endemisms from the Sinemurian onwards.
format	article
author	Yasuhiro Iba Shin-ichi Sano Jörg Mutterlose
author_facet	Yasuhiro Iba Shin-ichi Sano Jörg Mutterlose
author_sort	Yasuhiro Iba
title	The early evolutionary history of belemnites: new data from Japan.
title_short	The early evolutionary history of belemnites: new data from Japan.
title_full	The early evolutionary history of belemnites: new data from Japan.
title_fullStr	The early evolutionary history of belemnites: new data from Japan.
title_full_unstemmed	The early evolutionary history of belemnites: new data from Japan.
title_sort	early evolutionary history of belemnites: new data from japan.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/91fc6ed8d83747448ce77395e6136acb
work_keys_str_mv	AT yasuhiroiba theearlyevolutionaryhistoryofbelemnitesnewdatafromjapan AT shinichisano theearlyevolutionaryhistoryofbelemnitesnewdatafromjapan AT jorgmutterlose theearlyevolutionaryhistoryofbelemnitesnewdatafromjapan AT yasuhiroiba earlyevolutionaryhistoryofbelemnitesnewdatafromjapan AT shinichisano earlyevolutionaryhistoryofbelemnitesnewdatafromjapan AT jorgmutterlose earlyevolutionaryhistoryofbelemnitesnewdatafromjapan
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The early evolutionary history of belemnites: new data from Japan.

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