 For many years Odontogriphus ("toothed riddle") was known from only one specimen, an almost featureless oval smear on a slab, with hints of tiny conical teeth. However, 189 new finds in the years immediately preceding 2006 made a detailed description possible. It had a pair of slightly V-shaped tooth-rows just ahead of the mouth, very like Wiwaxia ′ s. This pitched Odontogriphus into the middle of the debate about whether Wiwaxia was closer to the mollusc or the annelid lineage, resulting in a frank exchange of views.
