Late Jurassic Four-Segmented Nassellarians ( Radiolaria ) from Shikoku, Japan

Abstract

Three species of Late Jurassic four-segmented nassellarians are described from the Naradani Formation in the Sakawa area, Shikoku, Japan. They are Stichocapsa naradaniensis n. sp., Stichocapsa robusta n. sp. and Cyrtocapsa sp. A. Stichocapsa naradaniensis n. sp. is the nominal species of Gongylothorax sakawaensis-Stichocapsa naradaniensis Assemblage from Southwest Japan....