临夏盆地晚中新世鸵鸟化石的特异保存

李志恒, 艾莉达, Thomas A. STIDHAM, 王敏, 邓涛

Exceptional preservation of an extinct ostrich from the Late Miocene Linxia Basin of China

LI Zhi-Heng, Alida M. BAILLEUL, Thomas A. STIDHAM, WANG Min, DENG Tao

Fig. 2 SEM photographs of the fragment of fossil ostrich trachea (IVPP V 25336) A. corresponding SEM image of tracheal sections in Fig. 4. It shows compact bone with very few vascular spaces and calcite infillings in the vascular spaces. B. SEM close-up of well-preserved bone, with an osteocyte lacuna. Some intralacunar material is present, and it is most likely the fossilized remnants of an original osteocyte. C. second histological cross section of the fragment. D. close-up of unaltered bone and osteocyte lacunae. E. high magnification on the osteocyte lacuna filling, most likely a fossilized remnant of the original ostrich osteocyte. F. close-up of porous area with exposed fibrous material, undoubtedly collagen fibers Abbreviations: CFs. fossilized collagen fibers; O. fossilized remnant of osteocyte; OL. osteocyte lacuna; Trach. tracheal ring; ub. unaltered bone matrix