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Clausa d'Orbigny, 1853


Scanning electron micrograph of growth tip in a fertile branch of Clausa heteropora.

Clausa heteropora (d'Orbigny, 1850)
Scanning electron micrograph (pdt1732) of distal tip of fertile branch showing free-walled zone proximal of the branch tip and digitate gonozooid
MNHN R61539a, d'Orbigny Collection, ?syntype, Cenomanian, Le Mans, Sarthe, France