Choanoflagellates

Timed: Branched off about 1.1 billion years ago · the last 25% of life's story
Named: ≈125 named living species · 0.007% of all named
Weighed: Not measured (no figure in Bar-On et al. 2018).

Eukaryotes · animals

Living · roughly 125 described species

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Single cells that look like the feeding cells of sponges; our closest relatives outside the animals.