Brown algae and kelp

Timed: Branched off about 1.1 billion years ago · the last 26% of life's story
Named: ≈2,000 named living species · 0.1% of all named
Weighed: Not measured (no figure in Bar-On et al. 2018).

Eukaryotes · single-celled groups

Living · roughly 2,000 described species

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A full profile for this group has not been written yet. Its place in the tree and its dates are shown below.

Giant kelp can grow half a metre in a day.