A rule of thumb known as the morphospecies concept holds that morphology:

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The morphospecies concept suggests that morphology (physical appearance) is generally consistent within a species. This means that individuals within a species should look similar enough to allow identification based on shared characteristics. However, it is important to note that there can be exceptions to this rule, such as sexual dimorphism or changes in morphology throughout an organism's life cycle.

A Rule of Thumb Known as the Morphospecies Concept Holds