2019

Epidiceras (Bivalvia, hippuritoidea) from the Tithonian–Berriasian Torinosu-type limestones of the Sakawa area, Southwest Japan

Sakawa bölgesindeki (Orta Shikoku, Güneybatı Japonya) Torinosu Grubu’na ait Titoniyen−Berriasiyen yaşlı Torinosu tipi kireçtaşlarından derlenen Epidiceras speciosum (Goldfuss) ve Epidiceras guirandi (de Loriol)’ye ait ilkel rudist örnekleri sistematik olarak ilk kez tanımlanmıştır. E. guirandi daha önce sadece Geç Kimmerisiyen’de Akdeniz Tetis’inde biliniyordu. Bu nedenle türün Güneybatı Japonya’da bulunuşu, türün bilinen biyocoğrafik ve stratigrafik yayılımını önemli ölçüde genişletmiştir. Ayrıca, E. speciosum’un Japonya’da Torinosu tipi kireçtaşlarında ve Sawarak’ta (Borneo) Bau kireçtaşı’nda bulunuşu da bu dönemde bu türün Tetis Alanı’nda yaygın olarak bulunduğunu gösterir. Doğu Tetis ve batı Pasifik’te ilk rudistlere ait bu bulgular, rudistlerin erken evrimsel tarihini anlamamıza yardımcı olmaktadır.

Sakawa bölgesindeki (Güneybatı Japonya) Titoniyen−Berriasiyen yaşlı torinosu tipi kireçtaşlarında saptanan Epidiceras (Bivalvia, hippuritoidea)

Excavated specimens of two primitive rudists, Epidiceras speciosum (Goldfuss) and Epidiceras guirandi (de Loriol), are systematically described for the first time from the Tithonian–Berriasian Torinosu-type limestones of the Torinosu Group in the Sakawa area, Central Shikoku, Southwest Japan. E. guirandi was previously known only from the Late Kimmeridgian Mediterranean Tethys, so this occurrence in Southwest Japan significantly extends the recorded biogeographical and stratigraphical distribution of the species. Moreover, the documentation of E. speciosum from the Torinosu-type limestones in Japan and the Bau Limestone in Sarawak, Borneo, indicate that this species was already widespread throughout the Tethyan Realm at that time. Such records of early rudists in the eastern Tethys and the western Pacific enhance our understanding of the early evolutionary history of rudists.

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