Reconstruction of Haootia quadriformis (2024)（Image source：McIlroy D et al， CC BY 4.0 ） Age Ediacaran 560 Ma Taxonomy Kingdom: Animalia Phylum: Cnidaria Class: Staurozoa Genus: Haootia Species: Haootia quadriformis Morphological description Haootia quadriformis is a quadrilaterally symmetrical organism characterized by a smooth, discoidal base connected via a short, striated stalk to a rectangular body. The fossil reveals that the disc measures approximately 56 × 37 mm al