Bangiomorpha pubescens

Assembled from 14 blocks · 1 evidence · 7 related

1. Story
2. A fossil red alga from the Hunting Formation of Somerset Island in Arctic Canada, described by Nicholas Butterfield in 2000, and one of the most information-dense single fossils in the Precambrian record. It is important for three separate reasons at once. It is the oldest fossil that can be assigned to a living eukaryotic group with confidence, being closely comparable to the modern red alga Bangia. It shows differentiated cell types — a specialised holdfast anchoring the filament to the substrate — which is complex multicellularity rather than a chain of identical cells. And its reproductive structures indicate differentiated spores, taken as the oldest direct evidence of sexual reproduction in the fossil record. Originally dated to roughly 1.2 billion years, the host formation was redated in 2018 to about 1.05 billion years; the redating is worth noticing because it moved a calibration point used by molecular clocks and therefore shifted a series of downstream divergence estimates that were not themselves re-examined.
3. Knowledge
4. The evolution of multicellularity
5. Bangiomorpha pubescens
6. Connections
7. The evolution of multicellularity
8. Endosymbiosis and the eukaryotic cell
9. Bangiomorpha pubescens
10. Francevillian Basin, Gabon
11. Ediacara Hills, Flinders Ranges
12. Centimetre-scale structures reported from 2.1 Ga Gabonese shales
13. Evidence
14. Supports the description of Bangiomorpha, its assignment to the red algae, its differentiated holdfast and the interpretation of its reproductive structures as evidence of sex. Deliberately cited without page numbers, which were not confirmed. V55 verification basis: this session had no network access to any source — WebFetch was egress-blocked and the WebSearch budget was exhausted — so the cited work was not retrieved and its pagination was not re-checked.