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通过研究陕南早寒武世疑难化石Rhombocorniculum cancellatum,首次发现其骨片主要由左型和右型两类刺体组成,两类刺体在样品中数量相近,指示它们为某类两侧对称的动物所有,研究发现其刺壁主要由中空的纤状管体组成,纤管的壁由微晶磷灰石组成,相邻纤管之间相互共壁;横断面观察呈多孔状,管孔在刺体基部断面直径较大,向顶端变小,纵断面可见纤管的延伸方向与刺体纵轴一致,刺壁微细结构及刺体的表面装饰皆不同于原牙形刺化石,难以解释为动物的捕食器官(刺),而可能为某类后生动物躯体表面的、起着防御功能的外骨骼。
Based on the study of the early fossils of South China, Rhombocorniculum cancellatum, it was first discovered that the bone fragments are mainly composed of two types of left and right spines, and the two types of spines are similar in quantity, indicating that they are some kind of bilateral symmetrical Animal studies have found that the prickly wall is mainly composed of hollow fiber-like tube, the wall of the quill is composed of microcrystalline apatite, adjacent quills co-wall between each other; cross-sectional was porous, tube hole in The basal section of the thorn body is larger in diameter and smaller toward the top. The longitudinal direction of the quills is consistent with the longitudinal axis of the thorn body in the longitudinal section. The fine structure of the thorn wall and the surface decoration of the thorn body are different from those of the original conodonts and can not be interpreted as An animal’s predator (prickle), which may be a defensive exoskeleton of the body surface of certain metazoans.