If 'caterpillar' is a phase sortal and 'organism' is an ultimate sortal, the statement 'this organism is not a caterpillar' reports phase-exit, not numerical non-identity, preserving classical identity logic intact.

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Classical identity logic(logic and metaphysics): The standard logical rules about when something is 'the same thing' versus 'a different thing.' The key rule is: if A is identical to B, then anything true about A must be true about B.
Numerical non-identity(logic and identity): The idea that two things are literally different entities—not the same thing. For example, saying a caterpillar and a butterfly are two different individuals rather than the same individual at different times.
Phase-exit(ontology (the study of what exists)): When something stops being in one temporary stage and enters another—like when a caterpillar becomes a butterfly, it exits the caterpillar phase.
phase sortal(Illustrated by 'human being is, was, or will be a baby'; contrasted with ultimate sortals.): A sortal that applies to an object under the temporal rubric 'was, is, or will be F', rather than requiring the object to satisfy the predicate at all times.

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