Origin of the vertebrate pectoral girdle and pectoral fins

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…

Figure 7 from Fossil Fishes from China Provide First Evidence of Dermal Pelvic Girdles in Osteichthyans

19.1 Types of Skeletal Systems – Concepts of Biology – 1st Canadian Edition

Devonian fish hi-res stock photography and images - Page 6 - Alamy

Frontiers Problems in Fish-to-Tetrapod Transition: Genetic Expeditions Into Old Specimens

Origin of vertebrate paired fins. Scheme of the gill-arch hypothesis

Laboratory Objectives for Comparative Vertebrate Anatomy Spring 2023

Origin of the vertebrate pectoral girdle and pectoral fins – overturned

davidpeters1954, The Pterosaur Heresies

Schematic diagram of pectoral girdle and proximal appendicular bones in