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

''Petitclercia'' is a genus of mollusk from the strigoceratid subfamily Disticocratinae which are included in the ammonitid superfamily Haplocerataceae. ''Petitclercia'', named by Rollier, 1909, is found in the upper Middled Jurassic (Callovian) of France.
The shell of ''Petitclercia'' is involute, very compressed, with a sharp umbilical angle and sharp fastigate venter. Spath (1928)speculated that ''Petitclercia'' is perhaps "an involute development of ''Chanasia''", another of the Distichoceratinae.
==References==

*Treatise on Invertebrate Paleontology, Part L, Ammonoidea; (L279), Geological Society of America and Univ of Kansas press, 1964

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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