These Ediacaran organisms thrived by living in low-energy inner shelf, in the wave- and current-agitated shoreface, and in the high-energy distributary systems.

[3] During the Belomorian of the Late Ediacaran other organisms who lived on the ocean floor diversified their appearances through frondomorphs, tribrachiomorphs, and bilateralomorphs.

Hallidaya became extinct in the Kotlinian (550-540 Ma) of the Late Ediacaran after there was an increase of migration to high-energy areas by burrowing animals.

These Ediacaran organisms were progressively outcompeted by bilaterians who anchored into the microbial mat of the ocean floor with their basal bulbs and possibly evolved a symbiosis with photoautotrophic or chemoautophrophic microorganisms.

[2] [4] There were also Ediacara fan-shaped sets of paired scratches found from the Eidacara Member of the Rawnsley Quartzite in South Australia, Kimberichnus teruzzii.

Their co-occurrence and systematic feeding traces in the Ediacara biota record supports the theory that bilaterians existed globally before the Cambrian explosion.