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Orthonychia extensum
Taxonomy
Platyceras extensum was named by Barrois (1889). It is a 3D body fossil. Its type locality is Chateau-Briant, just east of Erbray, which is in an Emsian carbonate limestone in the Calcaire d’Erbray Formation of France.
It was recombined as Orthonychia extensum by Wagner (2023).
It was recombined as Orthonychia extensum by Wagner (2023).
Sister species lacking formal opinion data