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Aphetoceras is a genus of tarphycerid cephalopod within the Estonioceratidae; loosely coiled without an impression along the dorsal margin; early whorls barely reaching, separating then diverging in the final mature whorl; weakly ribbed in some. The cross section of Aphetoceras is higher than wide, making it compressed in form. The dorsum, along the inner curve, is more broadly rounded than the venter which lies along the outer curve. The siphuncle is relatively large, located near but not at the ventral margin; lined with secondary deposits. Chambers are empty.

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  • Aphetoceras (en)
  • 鬆卷角石 (zh)
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  • 鬆卷角石(學名:Aphetoceras)是一屬已滅絕的鸚鵡螺類。牠們生活在晚奧陶紀的海洋中。其化石分布於北美及中國。 (zh)
  • Aphetoceras is a genus of tarphycerid cephalopod within the Estonioceratidae; loosely coiled without an impression along the dorsal margin; early whorls barely reaching, separating then diverging in the final mature whorl; weakly ribbed in some. The cross section of Aphetoceras is higher than wide, making it compressed in form. The dorsum, along the inner curve, is more broadly rounded than the venter which lies along the outer curve. The siphuncle is relatively large, located near but not at the ventral margin; lined with secondary deposits. Chambers are empty. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Aphetoceras_americanum.jpg
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  • Nautiloidea (en)
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  • Cephalopoda (en)
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  • Aphetoceras (en)
genus authority
  • Hyatt, 1894 (en)
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  • Artist's reconstruction of A. americanum (en)
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phylum
  • Mollusca (en)
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  • Animalia (en)
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  • Aphetoceras is a genus of tarphycerid cephalopod within the Estonioceratidae; loosely coiled without an impression along the dorsal margin; early whorls barely reaching, separating then diverging in the final mature whorl; weakly ribbed in some. The cross section of Aphetoceras is higher than wide, making it compressed in form. The dorsum, along the inner curve, is more broadly rounded than the venter which lies along the outer curve. The siphuncle is relatively large, located near but not at the ventral margin; lined with secondary deposits. Chambers are empty. Aphetoceras is similar in outline to the related Estonioceras and Alaskoceras but most similar in cross section to . Aphetoceras comes from the Lower Ordovician of North America and Australia and is one of the earlier tarphycerids found in the Lower Ordovician El Paso Group in New Mexico. (en)
  • 鬆卷角石(學名:Aphetoceras)是一屬已滅絕的鸚鵡螺類。牠們生活在晚奧陶紀的海洋中。其化石分布於北美及中國。 (zh)
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