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RARE AMMONITE BOSTRICHOCERAS, Cretaceous Campanian,...

Price Tax incl.:
6500 EUR

RARE AMMONITE BOSTRICHOCERAS, Cretaceous Campanian, Menabe region, Madagascar Ammonite of type Eubostrychoceras otsukai (Yabe, 1904) morphe boulei (Collignon, 1932). Lower Cretaceous Campanian, 83 to 72 million years, Menabe region, Madagascar. On its modern half-spherical base in light wood, with brass plate. H. 20 x D. 7,5 cm. H. 29 cm (with base). Provenance - Christie's Paris sale, April 16-17, 2008, lot 89 (sold for 9.250 €). - Private collection, France. History The ammonite undergoes a helical growth when juvenile and then in adulthood, the last turn goes up in a crook towards the top. The E. otsukai group is distinguished by its generally loose, corkscrew-like coiling over most of the shell. The early stages could be straight and aligned with the axis of the coiling, but not included in the helix. The boulei morphotype has a more or less tight coiling, an ornamentation of fine ribs more or less dense, straight, annular, simple, tightening without fading through the dorsal wall. The constrictions are very rare or absent. The umbilicus is very open.

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