Campendoceras

Campendoceras is a genus of proterocameroceratids from the Lower Ordovician of NW Australia and possibly Estonia that can be recognized by its  slender, weakly endogastric, longiconic  and annulate shell and large marginal siphuncle that contains endocones.

The curvature in Campendoceras is less distinct than that in Clitendoceras or Mcqueenoceras and the siphuncle is larger.