This created a problem, because the vertebrae selected by Lydekker came from unknown sediments and were not definitely associated with the original specimens named and described by Owen. Matters were complicated when the original holotype used by Owen was re-discovered, making the designation of a neotype unnecessary.
This led to complications, as the vertebrae selected by Lydekker came from unverified sources and were not clearly associated with the original specimens described by Owen. The discovery of the original holotype used by Owen added complexity to the situation, rendering a neotype unnecessary.