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Brazeau et al 2023 report,"The past 150 years of debate has been shaped by two contentious theories: the ventrolateral fin-fold hypothesis and the archipterygium hypothesis. The latter proposes that fins and girdles evolved from an ancestral gill arch. Although studies in animal development have revived interest in this idea, it is apparently unsupported by fossil…
Evolution of tetrapods - Wikipedia
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Schematic diagram of pectoral girdle and proximal appendicular bones in