Beothukis mistakensis from the Ediacaran System of Newfoundland, Canada demonstrates complex fractal-like morphology through the development of primary-, secondary- and tertiary-order Rangea-like units. The primary-order rangeomorph units observed in B. mistakensis are tightly juxtaposed, show no evidence of being independent of one another and are made up of chamber-like secondary-order – probably mesoglea-filled – units. The growth of these rangeomorph units demonstrates that the frond developed from the tip towards the basal region through ontogeny. The tertiary-order units of Beothukis are considered to represent surface morphology on the secondary-order units. This is in contrast to palaeobiological reconstructions of Beothukis that invoke three-dimensional fractal-like branches with independent units, which has been used to infer an osmotrophic mode of life. It is considered here that the fractal-like morphology of the lower surface of B. mistakensis was an adaptation to increase surface area to volume ratio. The quilted morphology of Beothukis proposed here is consistent with a sessile, reclining, phagocytotic and/or chemosymbiotic mode of life similar to that invoked for the reclining rangeomorph Fractofusus.

来自加拿大纽芬兰埃迪卡拉系统的 Beothukis wrongsis 通过初级、二级和三级 Rangea 状单元的发展，展示了复杂的类似分形的形态。在B. wrongsis 中观察到的一级范围形态单元紧密并列，没有显示出相互独立的证据，并且由类似腔室的二级单元组成 - 可能是中膜填充的 - 单元。这些rangeomorph单位的生长表明，叶子通过个体发育从尖端向基部发育。Beothukis的三级单位被认为代表二级单位的表面形态。这与贝托基斯的古生物学重建形成鲜明对比它调用具有独立单元的三维分形分支，已被用于推断渗透压的生活方式。此处认为， B. wrongsis下表面的分形形态是为了增加表面积与体积比的适应。这里提出的Beothukis绗缝形态与无柄、斜倚、吞噬和/或化学共生的生活模式相一致，类似于斜倚的 rangeomorph Fractofusus所调用的生活方式。