Sponges

Timed: Branched off about 750 million years ago · the last 18% of life's story
Named: ≈9,000 named living species · 0.5% of all named
Weighed: Part of All other animals (total minus the parts above) (≈0.13 Gt C), not measured separately.

Eukaryotes · animals

Living · roughly 9,000 described species

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Among the oldest animal lines still alive, with no muscles or nerves.