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Karoceratidae : ウィキペディア英語版 | Karoceratidae Karoceratidae is a nautiloid family within the order Oncocerida, characterized by straight or curved, laterally narrow, shells and slender, ventral siphuncles that are empty except in ''Karoceras''. Siphuncle segments are inflated ventrally but straight dorsally. Septal necks are cyrtochoanitic, outwardly curved; connecting rings are thin. Genera include ''Karoceras'', ''Osbornoceras'', and possibly ''Shuranoceras'', which have been found in sediments ranging from the Lower Silurian to possibly as young as the Lower Devonian. ==References==
* Walter C. Sweet, 1964. Nautiloidea - Oncocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
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「Karoceratidae」の詳細全文を読む
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