所属 川崎医療福祉大学 医療福祉学部 臨床心理学科 職種 特任教授
|著者・共著者||松岡敬二, 益田芳樹, 北林栄一|
|概要||Fossils of a spongillid sponge, Eunapius sinensis (Annandale) were discovered from the upper part of the Pliocene Hitoyoshi Formation of the Hitoyoshi Basin, Kumamoto Prefecture, Kyushu, Japan. They constitute the second occurence record of Eunapius sinensis as fossil. The Hitoyoshi Formation consists of lacustrine deposits, which contain diatoms, water plants, insects, cyprinid fishes, and molluscs besides the sponge. Gemmules of fossil sponges occur as rounded spots which encrust the surface of molluscan shells and massive mudstone. The spicular components consist of megascleres and gemmoscleres, and the latter are more abundant. This mode of occurence of fossil sponges suggests only gemmules were laft after death on the surface of molluscan shells and mud.
The recent Eunapius sinensis is distributed ovre China, Russia and Japan. Compared with the recent Eunapius sinensis, the Pliocene Eunapius sinensis is small in average length of megascleres.