Why is the classification of tetraodontiform fishes still being revised?

The classification of tetraodontiform fishes remains in a state of flux because researchers are actively refining their understanding of the evolutionary relationships between both living and fossil species.1

While traditional classifications have been established through the work of various experts, modern scientific inquiry continues to challenge and update these models. For instance, recent molecular studies suggest that Tetraodontiformes may be closely related to Lophiiformes (anglerfishes and their allies). However, this hypothesis is not yet definitive, as it requires further validation through the integration of both additional molecular data and morphological evidence. Consequently, the order is subject to ongoing critical appraisal as new data emerges.12