Key Laboratory for Paleobiology, Yunnan University, Kunming 650091, China.
Curr Biol. 2012 Nov 20;22(22):2149-54. doi: 10.1016/j.cub.2012.09.027. Epub 2012 Oct 18.
Exhibiting Orsten-type preservation, specimens of the phosphatocopine Dabashanella sp. from the Lower Cambrian Stage 3 (about 520 million years ago) of southern China possess a single-fold shield and a set of appendages of crustacean design. More significantly, a pair of stalked eyes-the earliest known visual structure in this group-is attached to an ocular segment analogous to the anterior sclerite of various stem-group arthropods. Accordingly, a unique visual system must have been present among some, if not all, early phosphatocopines. In comparison with the ground pattern of later members of this group, the new phosphatocopine, which with its unique head segmentation and limb design is unlikely to be embraced within the previously proposed Labrophora, demonstrates a remarkable modification and innovation in the appendages and visual system with time. Thus, this finding provides new data for the evaluation of the early evolutionary development and phylogenetics of the Crustacea and other related euarthropods.
展示出奥斯特型保存的、来自中国南方下寒武统 3 期（约 5.2 亿年前）的磷虾类化石标本拥有单一折叠的盾牌和一组甲壳类设计的附肢。更重要的是，一对具柄的眼睛——该类群中最早已知的视觉结构——附着在一个类似于各种干群节肢动物前硬骨片的眼节上。因此，一些（如果不是全部的话）早期磷虾类动物中肯定存在独特的视觉系统。与该类群后来成员的基础模式相比，这种新的磷虾类动物，由于其独特的头部分段和附肢设计，不太可能被归入之前提出的 Labrophora 中，它在附肢和视觉系统方面表现出显著的变化和创新。因此，这一发现为甲壳类动物和其他相关真节肢动物的早期进化发展和系统发生学提供了新的数据。
