() As a result, "Odontogriphus" has become prominent in the debate that has gone on since 1990 about the evolutionary origins of molluscs, annelid worms and brachiopods.A group of scientists think that "Odontogriphus"’s feeding apparatus, which is "nearly identical" to Wiwaxia’s, is an early version of the molluscan radula, a chitinous "tongue" that bears multiple rows of rasping teeth.