Eutely

In organisms of small size, errors in the examination and explanation of units may entirely negate reconstructions and deductions.

[5][6] Additionally, examples of cell constancy have been seen among arthropods, specifically within sensory and nervous organs.

[2] Since eutelic organisms have displayed such wide variety and diversity in lineage and ancestry, there is yet to be an attempt to establish a phylogenetic relationship.

Previous researchers have made efforts to determine the relationship between trematodes and rotifers as their complete constancy qualities suggest a close relatedness.

This quality is assumed to have been passed on to all subsequent metazoan groups: the development of constant cell numbers.

[2] Until 2001, roundworm species Caenorhabditis elegans was considered to be the model organism for complete cell constancy.

However, it was concluded that these variants were in a phase of senescence before they returned to their original complete cell count.

[2] Most examples of eutelic organisms display no certain proof for absolute cell number and arrangement constancy or inconstancy.

There is no evidence showing that this ability is ever regained, even after injury which normally functions to trigger mitosis and cell regeneration.

In 1927, a scientist named Jurczik observed that upon removing the arms of the rotifer Stephanoceros, they were unable to regenerate and grow back.

Van Cleave at the University of Illinois revealed physiological and morphological corrections of nucleus-cytoplasm intracellular protein interactions.