隐头虫
隐头虫（学名：Calymene），为一种早期小型海生节肢动物，体长约2公分。
隐头虫化石的发现处大多聚集在北美洲与欧洲，如：
Calymene
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Calymene 隐头虫
Calymene (meaning beautiful crescent as a reference to the glabella) is a genus of trilobites in the order Phacopida that are found throughout North America, North Africa, and Europe in primarily Silurian outcrops. Calymene is closely related to Flexicalymene, and both genera are frequently found inrolled. Calymene trilobites are small, typically 2 cm in length. Their cephalon is the widest part of the animal, and the thorax is usually in 13 segments.
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- schedule of construction plotted against nnp的意思
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- schedule of doors and windows and ironmongery的意思