Germany
Geological Time: Jurassic Upper Jurassic
the image is published in the paper mentioned below
holotype
View of a specimen of Gaudryinella mutabilis (Schwager, 1865)
The identification is based upon:
, : Schwager, C. (1865). Beitrag zur Kenntniss der mikroskopischen Fauna jurassischer Schichten. Württembergische naturwissenschaftliche Jahreshefte. 21 (1): 82-151. Plate , Fig.