生物
车身平面图
极性(国际关系)
分类单元
多细胞生物
前寒武纪
古生物学
生物群
现存分类群
进化生物学
生态学
细胞生物学
基因
生物化学
遗传学
胚胎
细胞
作者
Scott D. Evans,Ian V. Hughes,Emily B. Hughes,Peter Dzaugis,Matthew P. Dzaugis,James G. Gehlîng,Diego C. García‐Bellido,Mary L. Droser
摘要
Abstract Fossils of the Ediacara Biota preserve the oldest evidence for complex, macroscopic animals. Most are difficult to constrain phylogenetically, however, the presence of rare, derived groups suggests that many more fossils from this period represent extant groups than are currently appreciated. One approach to recognize such early animals is to instead focus on characteristics widespread in animals today, for example multicellularity, motility, and axial polarity. Here, we describe a new taxon, Quaestio simpsonorum gen. et sp. nov. from the Ediacaran of South Australia. Quaestio is reconstructed with a thin external membrane connecting more resilient tissues with anterior‐posterior polarity, left‐right asymmetry and tentative evidence for dorsoventral differentiation. Associated trace fossils indicate an epibenthic and motile lifestyle. Our results suggest that Quaestio was a motile eumetazoan with a body plan not previously recognized in the Ediacaran, including definitive evidence of chirality. This organization, combined with previous evidence for axial patterning in a variety of other Ediacara taxa, demonstrates that metazoan body plans were well established in the Precambrian.
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