Observations of Astiericeras astierianum (d'Orbigny, 1842) ( Cretaceous Ammonoidea).
Astiericeras astierianum (d'Orbigny, 1842) is redescribed, the type material illustrated for the first time and the range of intraspecific variation and striking sexual dimorphism documented. Previous suggestions that the early ontogeny of Astiericeras supports derivation from Douvilleiceras de...
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| 格式: | Journal article |
| 語言: | English |
| 出版: |
1986
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