Tag Archive for 'Bilateria'

Fossils of Spriggina floundersi from South Australia; white arrows highlight lifted areas, white triangle indicates divergent bend angle of adjacent modules. Scale bars - 10 cm. Image credit: Evans et al., doi: 10.1038/s41598-026-53857-x.

Ediacaran Sea Creature May Hold Earliest Evidence of Right-Handedness

Jul 10, 2026 by News Staff

Spriggina floundersi, a marine species that lived during the Ediacaran period 550 million years ago, is one of Earth’s earliest bilaterally symmetrical...

Reconstruction of the Jiangchuan Biota. Image credit: Xiaodong Wang.

Ediacaran Fossils from China Rewrite Timeline of Animal Evolution

Apr 6, 2026 by Enrico de Lazaro

An assemblage of more than 700 Ediacaran fossils from the end of the Ediacaran period indicates that key animal groups — including early relatives...

Oldest Bilaterian Fossil Found in Australia

Mar 24, 2020 by News Staff

Ikaria wariootia, a wormlike creature that lived more than 555 million years ago (Ediacaran period) in what is now Australia, is the earliest bilaterian,...

Trackways and burrows excavated in situ from the Shibantan Member, Dengying Formation, China: (A and B) epirelief (top bedding surface) and hyporelief (bottom bedding surface), respectively; trackways (TW1 and TW2) and undermat burrows (UB1 to UB3) are labeled; (C) latex mold of (B), with trackways and burrows marked and labeled; (D) enlargement of rectangle in (B), showing connection between TW2 and UB3 (marked). Scale bars - 2 cm. Image credit: Chen et al, doi: 10.1126/sciadv.aao6691.

Paleontologists Find Oldest Animal Footprints Ever Discovered

Jun 12, 2018 by News Staff

The oldest known animal ‘footprints’ on Earth, left by bilaterian animals with paired appendages about 545 million years ago, have been discovered...