Evolution of Invertebrates: From Choanoflagellates to the Cambrian Explosion

Dec 26, 2025

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The journey of invertebrates began with choanoflagellates, single-celled organisms that formed colonies and possibly evolved into the first animals, sponges. For over 3 billion years, life remained unicellular until the emergence of trace fossils revealing the “tracks and burrows” of early animals around 600 million years ago. The Ediacara fauna (565-544 MYA) showed a variety of body plans but lacked specialized tissues. The Cambrian Explosion (530-515 MYA) marked a significant evolutionary leap, introducing complex body plans and diversified animal forms, establishing invertebrates as the most abundant life forms on Earth.

1 choanoflagellates2 first animals3 ediacara fauna4 cambrian explosion5 trace fossils6 invertebrate evolution7 specialized tissue8 animal diversitytext

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Evolution of Invertebrates: From Choanoflagellates to the Cambrian Explosion

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