Coral calcification is a process of skeletal elements extension and is accompanied by the development of the coral's tissues. (peerj.com)
These results suggest that one of the key genetic events during the fin - to - limb evolution was a shift of the balance of the anterior and posterior fields (a «posteriorisation») and loss of anterior skeletal elements. (sciencedaily.com)
The remarkable specimen — which includes nine skeletal elements from one individual, including the thoracic vertebrae and the femoral bones — is being heralded as the «best preserved hesperornithiform material from Asia» and to be «the first report of the hesperorinthiforms from the eastern margin of the Eurasian Continent.» (sciencedaily.com)