Well preserved radiolarians of middle Permian age were extracted from a manganese carbonate nodule from the Nishiki Group of the Akiyoshi Belt in southwest Japan. These radiolarians consist of a middle Permian assemblage, including Parafollicucullus yanaharensis, P. lanceolatus, and Albaillella foremanae as well as two species newly described in this paper, P. babelis sp. nov. and P. grandis sp. nov. Because of their excellent state of preservation, we were able to study the structures of several species of Parafollicucullus in detail. Some have been previously recognized, including multilayered shells, a boundary structure (“pre-pseudoabdominal junction”) between the pre-pseudoabdomen and pseudoabdomen, a hole structure at the base of the wing, a “lingula” structure at the foot, and a “pleat” or folded structure resembling a skirt on the wing. These features should provide new criteria to distinguish species of Parafollicucullus.
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1 April 2020
Morphological Insights from Extremely Well-Preserved Parafollicucullus (Radiolaria, Order Albaillellaria) from a Probable Roadian (Guadalupian, Middle Permian) Manganese Nodule in the Nishiki Group of the Akiyoshi Belt, Southwest Japan
Takanori Nakagawa,
Koji Wakita
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Paleontological Research
Vol. 24 • No. 2
April 2020
Vol. 24 • No. 2
April 2020
Guadalupian
Nishiki Group
Parafollicucullus
Permian
Radiolarian
southwest Japan