Spathorhynchus natronicus, a new species of rhineurid amphisbaenian (Reptilia) from the early Oligocene of Wyoming
Spathorhynchus natronicus, a new species of rhineurid amphisbaenian (Reptilia) from the early Oligocene of Wyoming
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Spathorhynchus natronicus，来自怀俄明州渐新世早期的莱茵科两栖类（爬行动物）新种
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Berman
中科院分区：
文献类型：
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作者：
D. Berman
本文根据怀俄明早渐新世怀特河组保存完好的头骨材料，描述了一种新的双斑犀科动物，Spathorhynchus natronicus。许多特征将其与始新世中早期的Spathorhynchus fossorium（布里杰组和怀俄明州风河组）（该属唯一的其他已知物种）区分开来，这些特征与Rhineuridae作为一个整体从始新世到现代经历的头骨的一般结构趋势有关。Spathorhynchusfossorium和S. natronicus也显示出一些头骨特征，表明与这一历史不同，并表明Spathorhynchus可能在始新世早期作为一个独立的进化系而建立起来。
A new species of rhineurid amphisbaenian, Spathorhynchus natronicus, is described on the basis of well preserved skull material from the Early Oligocene White River Formation of Wyo- ming. Many of the characters separating it from Spathorhynchus fossorium of the Middle and Early Eocene Bridger and Wind River Formations of Wyoming, the only other known species of this genus, are related to general structural trends of the skull that members of the Rhineuridae as a whole have undergone from the Eocene to the Recent. Spathorhynchusfossorium and S. natronicus also exhibit a number of cranial features that suggest a divergence from this history and indicate that Spathorhyn- chus may have become established as a separate evolutionary line during the Early Eocene.