pectoral girdle skeleton arciferal girdle This class was sourced from an external ontology (amphibian_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon UBERON:3000941 Pectoral girdle in which the epicoracoid cartilages are elaborated into posteriorly directed epicoracoid horns. Most arciferal pectoral girdles are characterized by fusion of the epicoracoid cartilages in the interclavicle region. Posterior to the clavicles, the epicoracoids usually are free and overlapping.