Fig. 3 in Bone histology of eosauropterygian diapsid Proneusticosaurus silesiacus from the Middle Triassic of Poland reveals new insights into taxonomic affinities

Fig. 3. Growth pattern in the femoral cross section of the eosauropterygian diapsid Proneusticosaurus silesiacus Volz, 1902 (MGU Wr. 4438s), from the Lower Muschelkalk of Poland; in normal (A1) and polarized (A2) light. Arrows indicate the end of annual growth cycles. Altogether seven annual cycles are counted. The individual thus died in its 8 year of life. The innermost juvenile tissue is also divided by a clear growth mark, accompanied by a distinct change in tissue organization and vascularization. In polarized light subcycles are obvious, marked by grey arrows.