骨组织特征在确定恐龙生长阶段、了解恐龙骨骼生长规律、鉴定零散化石的属种等方面具有重要指示意义。本文为了解四川盆地蜥脚类恐龙的骨组织特征, 选取了广元马门溪龙Mamenchisaurus guangyuanensis的18 个骨骼化石, 制成薄片并在电子显微镜下进行了观察和分析, 结果表明: 1)广元马门溪龙的长骨骨组织保存有密质骨和松质骨, 无明显的内环骨板; 脉管呈圆形和椭圆形; 2)不同生长阶段个体在骨密质厚度、哈弗斯代数等方面存在显著差异; 3)广元马门溪龙与其他蜥脚类的骨组织存在诸多差异。其中, 脉管呈圆形和椭圆形且形态不随着生长阶段的变化而变化是广元马门溪龙区别于诸多蜥脚类的显著特点。

The osteohistological characteristics of dinosaurs are significant for determining ontogenetic stages, understanding skeletal growth patterns, and identifying isolated fossils. This study aims to elucidate the osteohistological characteristics of the sauropods from the Sichuan Basin. Eighteen samples from different individuals of Mamenchisaurus guangyuanensis were examined. Thin section were prepared for these samples, and subsequently were observed under a SEM. The results indicate that: (1) the long bone histology of M. guangyuanensis is preserved with compact and cancellous bones, but lacks obvious inner circumferential lamellae, and vascular canals are small, round, and oval; (2) individuals at different growth stages demonstrate distinct differences in the thickness of compact bones and the development of Haversian systems; and (3) many differences in bone tissues exist between M. guangyuanensis and other sauropods. In particular, M. guangyuanensis differs from many other sauropods in possessing round and oval vascular canals that remain morphologically consistent throughout all growth stages.

国家自然科学基金面上项目(41772100)、国家自然科学基金科技传播项目(42442064)和四川省科技厅科技计划项目(2021JDKP0067)联合资助