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A new species is established on a number of specimens from the Lower Cenomanian (zone of Mantelliceras japonicum) of the Ikushumbets area. It is referred to a new subgenus of Kossmatella, together wit...h allied species from the Pacific Coast of North America, K. filicinctum (WHITEAVES) and K. cappsi IMLAY. The new subgenus is characterized by the Kossmatella type ribs and constrictions on the inner whorls of 10-15 mm, infrequent and indistinct appearance of such ribs in the middle growth-stages and again prominent fold ribs and furrows on the probably adult outer whorl. The intimate relationships of Kossmatella with Eogaudryceras and Anagaudryceras are discussed.続きを見る
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Mendeley出力
21_02_p207