A New Species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the Lower Campanian in the Northwestern Pacific Realm

Daisuke Aiba; Harunobu Yamato; Ken'ichi Kurihara; Tomoki Karasawa

doi:10.2517/2016PR028

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1 July 2017 A New Species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the Lower Campanian in the Northwestern Pacific Realm

Daisuke Aiba, Harunobu Yamato, Ken'ichi Kurihara, Tomoki Karasawa

Author Affiliations +

Daisuke Aiba,^1,2 Harunobu Yamato,³ Ken'ichi Kurihara,⁴ Tomoki Karasawa¹

¹Mikasa City Museum, 1-212-1 Nishiki-machi, Ikushumbetsu, Mikasa, Hokkaido 068-2111, Japan (e-mail: ) aiba698@city.mikasa.hokkaido.jp
²Graduate School of Environment and Information Sciences, Yokohama National University, 79-7, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
³Volunteer's Association of Mikasa City Museum, 1-212-1 Nishiki-machi, Ikushumbetsu, Mikasa, Hokkaido 068-2111, Japan
⁴Hokkaido Museum, 53-2 Konopporo, Atsubetsu-cho, Atsubetsu-ku, Sapporo, Hokkaido 004-0006, Japan

Paleontological Research, 21(3):255-264 (2017). https://doi.org/10.2517/2016PR028

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Abstract

A new species of heteromorph ammonoid Eubostrychoceras valdelaxum sp. nov. is described from the Platyceramus japonicus Zone (the lowermost Campanian) of the Haboro and Mikasa areas in Hokkaido, northern Japan. The most notable characteristic of E. valdelaxum sp. nov. is its extremely longitudinally elongated helical whorls. The new species is clearly distinguished from other species by this characteristic. The shell ornamentation and whorl expansion rate of the new species resemble most closely those of E. japonicum. Considering the stratigraphic relationships, it is the most reasonable conclusion that E. valdelaxum sp. nov. evolved from E. japonicum. The variation of body chamber size in E. valdelaxum sp. nov. might be dimorphism.

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Daisuke Aiba, Harunobu Yamato, Ken'ichi Kurihara, and Tomoki Karasawa "A New Species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the Lower Campanian in the Northwestern Pacific Realm," Paleontological Research 21(3), 255-264, (1 July 2017). https://doi.org/10.2517/2016PR028

Received: 3 April 2016; Accepted: 1 October 2016; Published: 1 July 2017

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Paleontological Research
Vol. 21 • No. 3
July 2017

KEYWORDS

ammonoid

Campanian

Cretaceous

Eubostrychoceras

Hokkaido

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Daisuke Aiba, Harunobu Yamato, Ken'ichi Kurihara, Tomoki Karasawa "A New Species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the Lower Campanian in the Northwestern Pacific Realm," Paleontological Research, 21(3), 255-264, (1 July 2017)

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