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4种平胸鸟类腰荐部骨骼的比较 被引量:4
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作者 张子慧 侯连海 《动物学杂志》 CAS CSCD 北大核心 2006年第1期100-102,共3页
对鹤鸵(Casuarius casuarius)、鸸鹋(Dromaius novaehollandiae)、美洲鸵鸟(Rhea americana)和鸵鸟(Struthio camelus)的腰荐部骨骼进行了对比。鸸鹋与鹤鸵在愈合荐骨的数目与构成、腰带的结构方面最为相似,均为开放式骨盆。美洲鸵鸟和... 对鹤鸵(Casuarius casuarius)、鸸鹋(Dromaius novaehollandiae)、美洲鸵鸟(Rhea americana)和鸵鸟(Struthio camelus)的腰荐部骨骼进行了对比。鸸鹋与鹤鸵在愈合荐骨的数目与构成、腰带的结构方面最为相似,均为开放式骨盆。美洲鸵鸟和鸵鸟均为非开放式骨盆,前者的坐骨大部愈合,后者的耻骨后角左右愈合。与突胸鸟类对比发现:平胸类的愈合荐骨相对较长,髂骨后翼狭窄、几乎垂直伸向下方;突胸鸟类的髂骨后翼宽阔、水平侧向伸展并微微向背方拱起。反映了平胸类结构的原始性。 展开更多
关键词 骨骼 愈合荐骨 腰带 平胸类
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An integrative insight into the synsacral canal of fossil and extant Antarctic penguins
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作者 Piotr JADWISZCZAK Anders SVENSSON-MARCIAL Thomas MÖRS 《Integrative Zoology》 SCIE CSCD 2023年第2期237-253,共17页
The lumbosacral-canal system in birds most likely operates as a sense organ involved in the control of balanced walking and perching,but our knowledge of it is superficial.Penguins constitute interesting objects for th... The lumbosacral-canal system in birds most likely operates as a sense organ involved in the control of balanced walking and perching,but our knowledge of it is superficial.Penguins constitute interesting objects for the study of this system due to their upright walking,but only the Humboldt penguin,Spheniscus humboldti,and some incomplete fossil penguin synsacra have been studied in this respect.Here,we give an integrative comparative in-sight into the synsacral canal of extant Emperor penguin,Aptenodytes forsteri,Adelie penguin,Pygoscelis adeliae,and Eocene giant Anthropornis and/or Palaeeudyptes Antarctic penguins,using computed tomography imaging and associated data-extraction methodologies,complemented by analytical approaches ranging from geometric morphometrics to modularity,curvature,and wavelet analyses.We document that the variability in the number of synsacro-lumbar vertebrae is evolutionarily conserved,and all studied synsacra possess osteological correlates of the lumbosacral-canal system.We also found that Eocene and extant Antarctic penguins were separable on the basis of the main direction of the shape-related(size-independent)variability within said system,and A.forsteri was unique in the entire studied set in terms of the relative cranial shift of this compound structure.Moreover,we suggest that the evolutionary processes,shaping both the terrestrial posture and gait,were responsible,in extant penguins,for the increased simplicity and stability of the synsacral canal cross-sectional periodic patterns,as well as pave the way for the lumbosacral-canal system modularity characterized by reduced atomization/complexity. 展开更多
关键词 ANTARCTICA CENOZOIC lumbosacral canals Sphenisciformes synsacrum
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