Fragmentary hadrosauroid material from Spain, France and Germany, that had been referred to Orthomerus, is now often assigned to Telmatosaurus, but an identity is hard to prove; the same is also true of many Romanian fragments and eggs.
Previously categorized as Orthomerus, fragmented hadrosaur remains found in Spain, France, and Germany are now frequently placed within the genus Telmatosaurus. However, confirming their exact classification remains difficult due to the limited nature of the available evidence. The same uncertainty applies to numerous Romanian fragments and eggs.