Are vertebrates constrained to two sets of paired appendages? The morphology, development, and evolution of pre‐pelvic claspers in the Holocephali

RC Jones, K Hall, KD Crow - Journal of Morphology, 2023 - Wiley Online Library
Holocephalans exhibit auxiliary appendages called pre‐pelvic claspers (PPCs) that are
located anterior to the pelvic fins, while pelvic claspers are pelvic fin modifications located …