Liroceratidae

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The '''Liroceratidae''', named by Miller and Youngquist in 1949, is the ancestral family, or root stock, of the Clydonautilaceae, having gaven rise to the other four families; to the Ephippioceratidae in the Early Carboniferous (Early Mississippian) and to the Clydonautilidea, Gonionautilidae, and Siberonautilidae in the Triassic. Of the five families that make up the Clydonautilaceae, the Liroceratidae has the longest duration, ranging probably from the Late Devonian (Early Carboniferous (Miss) for sure) almost to the end of the Triassic.
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The '''Liroceratidae''', named by Miller and Youngquist in 1949, is the ancestral family, or root stock, of the Clydonautilaceae, having gaven rise to the other four families; to the [[Ephippioceratidae]] in the Early Carboniferous (Early Mississippian) and to the Clydonautilidea, Gonionautilidae, and Siberonautilidae in the Triassic. Of the five families that make up the Clydonautilaceae, the Liroceratidae has the longest duration, ranging probably from the Late Devonian (Early Carboniferous (Miss) for sure) almost to the end of the Triassic.
The Liroceratidae are characterized by generally smooth shells with broadly rounded, depressed whorls, and an occluded umbilicus; slightly sinuous sutures and a more or less central siphuncle.
The Liroceratidae are characterized by generally smooth shells with broadly rounded, depressed whorls, and an occluded umbilicus; slightly sinuous sutures and a more or less central siphuncle.

Revision as of 23:47, 6 December 2011

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