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Estonioceratidae : ウィキペディア英語版
Estonioceratidae

The Estonioceratidae is a family of loosely coiled tarphycerids in which the inner side of the whorls, which forms the dorsum, is rounded or flat with no impression; and in which the siphuncle, composed of thick tubular segments, is located ventrally. The Estonioceratidae seem to form a link between the ancestral Bassleroceratidae and the more tightly coiled Tarphyceratidae.
==References==

*Flower, R. H. 1976. Ordovician Cephalopod Faunas and Their Role in Correlation ''in'' The Ordovician System: proceedings of a Palaeontological Association symposium, Sept 1974.
*Furnish, W. M, and Glenister, Brian F. 1964. Nautiloidea – Tarphycerida; Treatise on Invertebrate Paleontology, Part K, Geol. Soc. of America, Teichert and Moore (eds.)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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