Petitclercia

Petitclercia is a genus of molluscs from the strigoceratid subfamily Disticocratinae which are included in the ammonitid superfamily Haplocerataceae. "Petitclercia", named by Rollier, 1909.
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.
Distribution.
Only found in the upper Middle Jurassic (Callovian) of Vendée, France.