Two warm-water species of Trochoidea (Gastropoda) from Pliocene deposits on the Japan Sea side of Honshu, Japan, with remarks on the influence of the onset of Northern Hemisphere glaciation
Amano, K. (2019). Two warm-water species of Trochoidea (Gastropoda) from Pliocene deposits on the Japan Sea side of Honshu, Japan, with remarks on the influence of the onset of Northern Hemisphere glaciation. The Nautilus 132(2): 57–66
In: The Nautilus. Bailey Matthews Shell Museum: Silver Spring. ISSN 0028-1344, more
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| Abstract |
Two warm-water trochoidean gastropods are studied. One of them, Monodonta joetsuensis new species, is the first Pliocene record of this genus in Japan. Another, Pomaulax omorii (Shibata, 1957), is distributed widely along the Japan Sea side of Honshu. In the Japan Sea borderland, both species are confined to late Pliocene deposits and became extinct as a result of cooling at the onset of Northern Hemisphere glaciation near the end of the Pliocene (2.75 Ma). It has become clear that thirteen shallowwater suspension-feeding bivalves, including Miocene relict forms, and eleven grazing or predatory/scavenging gastropods that mostly lived in warm shallow-water disappeared from the Japan Sea during this cooling event. Accordingly, I also discuss the influence of the onset of major Northern Hemisphere glaciation to the molluscan fauna in the Japan Sea borderland. |
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