Thectardis avalonensis is a triangular-shaped member of the Ediacara biota, dating from 575 to 565 million years ago. The organism took the form of an elongated cone with a central depression, and its apex was anchored to the substrate.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0