Gallina Pablo A
CONICET, Área de Paleontología, Fundación de Historia Natural Félix de Azara, Departamento de Ciências Naturales y Antropología, Ciudad Autonoma de Buenos Aires, Argentina.
An Acad Bras Cienc. 2011 Mar;83(1):235-46. doi: 10.1590/s0001-37652011005000001. Epub 2011 Feb 4.
Sauropod axial anatomy is particularly important in understanding morphological features and phylogenetic analyses. Spatial arrangement of zygapophyses and rib articulations, as well as their complex laminar development, help to recognize the relative position of isolated vertebral elements. The presence of anterior, mid and posterior elements along the cervical, dorsal and caudal series in Bonitasaura salgadoi allows the analysis of several anatomical characteristics. These include the pattern of neurocentral closure with unfused, partially fused and completely fused elements in a peculiar temporal sequence, as well as several neural spine modifications and the laminar arrangement. The variations in neural spine morphology include a lateral expansion of the distal tip in cervico-dorsal region, different lateral constituents of these lateral expansions, and a marked deviation in spine angulation. The spinal inclination allows the division into three easily recognizable vertebral regions separated by two landmarks, which adds support in the determination of an accurate vertebral position for isolated elements. Finally, an analysis of the vertebral laminae reveals the importance of examining vertebral series in order to recognize laminar homologies and developmental series. Two vertebral laminae are analyzed here.
蜥脚类恐龙的轴向解剖结构对于理解形态特征和系统发育分析尤为重要。关节突和肋骨关节的空间排列，以及它们复杂的板层发育，有助于识别孤立椎体的相对位置。在萨尔加多博尼塔龙的颈椎、背椎和尾椎系列中存在前部、中部和后部元素，这使得对多种解剖特征的分析成为可能。这些特征包括神经中央闭合模式，其具有未融合、部分融合和完全融合的元素，呈现出独特的时间顺序，以及多种神经棘的变化和板层排列。神经棘形态的变化包括颈背区域远端尖端的侧向扩展、这些侧向扩展的不同侧向组成部分，以及棘角度的明显偏差。脊柱倾斜度使得可以分为三个易于识别的椎体区域，由两个标志分隔，这为确定孤立元素的准确椎体位置提供了支持。最后，对椎板的分析揭示了检查椎体系列以识别板层同源性和发育系列的重要性。这里分析了两个椎板。
