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1 October 2021 An Additional New Species of Turbo (Marmarostoma) (Gastropoda: Turbinidae) from the Middle Miocene of the Izu Peninsula, Central Japan
Susumu Tomida, Hayato Sano, Tomoki Kase
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Abstract

The turbinid gastropod Turbo (Marmarostoma) is common in the limestone bodies within the middle Miocene Sakurada and Kadono formations (Yugashima Group) on the Izu Peninsula, central Japan. The limestone bodies were originally deposited under a low-latitude, tropical climate in the northeastern Philippine Sea and then drifted northwards on the Philippine Sea Plate. This paper describes an additional species, Turbo (Marmarostoma) ishidai sp. nov., from the Ena Limestone on the south-western Izu Peninsula. This new species is characterized by its large shell size and shell form similar to the modern Australian endemic species Turbo (Marmarostoma) cepoides , but differs in having thick tuberculate spiral cords on the shell surface of earlier teleoconch whorls instead of the smooth and broad spiral cords on and around the angled shoulder. The addition of this new species further highlights the presence of a biodiversity hotspot of this gastropod group in the northeastern Philippines Sea during the middle Miocene.

© by the Palaeontological Society of Japan
Susumu Tomida, Hayato Sano, and Tomoki Kase "An Additional New Species of Turbo (Marmarostoma) (Gastropoda: Turbinidae) from the Middle Miocene of the Izu Peninsula, Central Japan," Paleontological Research 25(4), 375-378, (1 October 2021). https://doi.org/10.2517/2021PR006
Received: 2 May 2020; Accepted: 27 July 2020; Published: 1 October 2021
JOURNAL ARTICLE
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KEYWORDS
central Japan
Ena Limestone
Izu Peninsula
middle Miocene
Sakurada Formation
Turbo (Marmarostoma) ishidai sp. nov
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