Liu et al., 2014
Haootia quadriformis is unlike anything previously described from the Ediacaran Period. Known from only two specimens on the Bonavista Peninsula of Newfoundland, Haootia possesses a fibrous body plan consisting of a central radial disc anchoring the organism to the sediment; a short stalk; and a quadrate body with fibrous bundles, with dichotomously-dividing branches in each of its four corners. A series of smaller subsidiary branches emanate from its lateral margins.
The original authors interpreted Haootia's fibrous bundles to be evidence for muscular tissue, and suggested that the four-fold radial symmetry, muscle tissue, and morphological and taphonomic similarity to modern and fossil cnidarians support a cnidarian biological affinity (Liu et al., 2014). Haootia is considered to have had a benthic mode of life, and appears to have been a rare but evolutionarily significant component of Ediacaran marine ecosystems ~560 million years ago.