The first animals had soft bodies and lacked the necessary body parts to be mineralized into fossils.
From the Ediacaran through the Cambrian, a series of stunning finds, including embryos, have recently brought new life to the fossil record of the earliest animals. However, numerous questions, not the least of which is the date and interpretation of the fossils, are still up for debate.
Before making claims regarding the affinities of the earliest fossils, it is especially important to carefully investigate characteristics of their taphonomy.
The fossil record of at least primitive organisms, such as sponges and maybe cnidarians, can now be extended to a time period that occurred substantially earlier than the Cambrian.
The Cambrian explosion itself still appears to mark the appearance of the bilaterians, and numerous additional fossil discoveries in recent years have significantly increased our knowledge of how the three main bilaterian clades originated.
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