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Peronidella
''Peronidella'' is an extinct genus of Calcareous sponges found in marine sedimentary rocks dated between the Devonian and the Cretaceous periods.〔 These sponges had cylindrically shaped walls, with a typical diameter of 2 cm,〔 with a small platform at the top, showing the position of the Osculum. Many species, such as ''Peronidella furcata'', were colonial; however, several solitary species are known. These sponges are relatively abundant in European chalks ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Peronidella」の詳細全文を読む
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