Bryozoan fossils confirm animal phylum's presence during Cambrian explosion
Newly discovered fossils reveal that bryozoans, marine invertebrates that form colonies, were present and had already diversified during the Cambrian explosion around 538 million years ago, contrary to previous scientific assumptions. Bryozoans were long thought to be absent from this rapid evolutionary period, making this discovery significant for understanding early animal evolution. The findings reshape our understanding of which animal groups participated in the Cambrian radiation and the diversity of life during this critical evolutionary window.
Researchers have discovered fossils from the Cambrian period that authenticate the presence of bryozoans during the Cambrian explosion, a rapid evolutionary event that began approximately 538 million years ago. Bryozoans are marine invertebrates that live in colonies, and their absence from the Cambrian fossil record had been a long-standing assumption in paleontology. The newly identified fossils, characterized by high-fidelity modular skeletons, demonstrate that bryozoans not only existed during this period but had already undergone significant diversification. This discovery, published in Nature by Song et al., challenges previous understanding of which animal phyla participated in the Cambrian radiation and provides new insights into the complexity of early animal evolution during this transformative period in Earth's history.
Limitations & open questions
The specific geographic location(s) where these bryozoan fossils were discovered is not mentioned in the provided excerpt. Additionally, details about the morphological characteristics that distinguish these Cambrian bryozoans from later forms, or how they compare to other Cambrian fauna, are not included.
What different sources said
- Nature NewsCenter
Confirmation that bryozoan animals were present during the Cambrian explosion
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