A New Species of the Heteromorph Ammonoid Phylloptychoceras from the Lowest Maastrichtian of Hokkaido, Japan

Yasunari Shigeta; Tomohiro Nishimura

doi:10.2517/1342-8144-17.2.173

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Yasunari Shigeta,¹ Tomohiro Nishimura²

¹Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan (e-mail: ) shigeta@kahaku.go.jp
²Hobetsu Museum, 80-6, Hobetsu, Mukawa, Hokkaido 054-0211, Japan

Abstract

A new Cretaceous heteromorph ammonoid, Phylloptychoceras horitai sp. nov., is described from the lowest Maastrichtian of Hokkaido, Japan. Its shell is ornamented with very weak, broadly rounded ribs and its suture line is characterized by a deeply incised, trifid dorsal lobe and three bifid lateral saddles with minor indentations. This occurrence suggests that Phylloptychoceras evolved in the North Pacific during late Campanian or early Maastrichtian time and then achieved worldwide distribution during late Maastrichtian time.

Citation Download Citation

Yasunari Shigeta and Tomohiro Nishimura "A New Species of the Heteromorph Ammonoid Phylloptychoceras from the Lowest Maastrichtian of Hokkaido, Japan," Paleontological Research 17(2), 173-178, (1 July 2013). https://doi.org/10.2517/1342-8144-17.2.173

Received: 28 March 2012; Accepted: 1 September 2012; Published: 1 July 2013

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