Eubostrychoceras Heteromorph Ammonite, from Madagascar (No.73)

£ 140.00
Eubostrychoceras Heteromorph Ammonite, from Madagascar (No.73)

Eubostrychoceras Heteromorph Ammonite
from Tsirbihina, Madagascar
80 Million Years, Upper Cretaceous

Measurements Approx.
Height - 5.4 cm
Width - 5.6 cm
Length - 11.2 cm 

Eubostrychoceras is a genus of helically wound, corkscew form, Heteromorph Ammonite which lived during the Upper Cretaceous.

The shell of Eubostrychoceras is a loosely to tightly wound spiral forming a corkscrew with an open, empty umbilicus in the middle. coiling is commonly dextral (right hand). Coils are covered by moderately strong, straight transverse ribs. The aperture, or apertural end, reverses general direction and points upwards or back towards to apex. Sutures are moderately complex. The siphuncle is located mid flank.