Eubostrychoceras is a genus of helically wound, corkscrew form, heteromorph ammonite which lived during the Upper Cretaceous (M Turonian - Campanian).

[4] The shell of Eubostrychoceras is a loosely to tightly wound spiral forming a corkscrew with an open, empty umbilicus in the middle.

Eubostrychoceras has a widespread distribution in the Upper Createous and has been found in Antarctica, Japan, Spain, the far east of Russia, Alaska, Vancouver Island, U.S. Western Interior Seaway, Germany, and Madagascar.

[2] Based on the similarity of textures and the curl of the shell as well as the stratigraphic relationships, E. valdelaxum from Japan is likely evolved from E.

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