Final answer:
The morphospecies species concept identifies evolutionary independence based on morphological differentiation, where distinct physical characteristics suggest different species.
Step-by-step explanation:
Under the morphospecies species concept, the criterion for identifying evolutionary independence is c. Morphological differentiation. This concept emphasizes the importance of distinct physical characteristics to differentiate between species. It operates under the assumption that significant morphological differences suggest different species as they are likely the result of a separate evolutionary trajectory. While reproductive isolation is important in other species concepts, such as the biological species concept, it is the distinct morphological features that define a species under the morphospecies concept.