Which group, including later forms like *Iguanodon*, was suggested as a closer relationship to *Xiaosaurus* based on teeth and general build?
Answer
Ornithopoda
While some initial interpretations hinted at an affiliation with the armored Thyreophora, other researchers prioritized different sets of morphological data when classifying *Xiaosaurus*. These researchers focused more intently on features such as the structure of the teeth and the overall lightweight build of the animal. Based on these observations, they proposed that *Xiaosaurus* held a closer evolutionary relationship to the Ornithopoda group, which is significant because this lineage later evolved into well-known forms such as *Iguanodon*.
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