part of part of in taxon derived from ancestral fusion of derived from ancestral fusion of Tyrannosaurus rex Archosauria Aves pectoral girdle bone pectoral girdle skeleton furcula furcula bone wishbone UBERON:0007841 Found in both avian and non-avian theropods including, but not limited to: Coelophysoids, Allosauroids, Spinosauridae, Tyrannosauroids, Oviraptorosauria, Troodontidae and Dromaeosauridae currently assigned to be part of the pectoral girdle, but this may be incorrect if PG is a paired structure. fused clavicle Dermal bone that develops from the fusion of the paired clavicle condensations in Archosauria. Serves as both an attachment site for pectoral musculature as well as a mechanical strengthening/ spacing element in the pectoral girdle. [PHENOSCAPE:ad]. Wikipedia:Furcula right clavicle left clavicle dermal bone interclavicle