1887

Abstract

Summary

The nature of the Vendian soft-bodied organisms still is being disputed, despite the long history of the study. In particular, circular forms are considered to be colonies of the protozoa, sponges, cyanobionts and coelenterata. We proceeded from the assumption that the allometric relation between the total body diameter and diameter of the gastral cavity must be characteristic for coelenteratas. In order to check whether is likely that the Vendian sessile circular forms were close to coelenteratas, we studied the ratio between dimensional characters in Tirasiana Palij 1976. Imprints (positive hyporelief) of Тіrasiana consist of two superimposed discs, internal and external. Respectively, two characters (internal diameter and external diameter) have been studied. Computations were performed using the program R v. 3. 4. 2 (RCoreTeam, 2017) and the package gvlma v. 1. 0. 0. 3 ( ).

It has been shown that the relationship between internal and external diameters of the body of Tirasiana is linear. The model of linear regression for the inner diameter has been calculated on the basis of the log-transformed data. The results do not prove the hypothesis of the allometric ratio between dimensional parameters in Tirasiana; on the contrary, a strict linearity and isometry of these parameters has been shown.

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/content/papers/10.3997/2214-4609.201902113
2019-05-15
2024-03-29
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References

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