Ochrophyta (Brown Algae)
Class: Bacillariophyceae
Order: Cymbellales
Family: Cymbellaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Cymbella mirabilis | Hustedt | (rediscovered) | Indonesia | Rediscovered | Access |
Class: Phaeophyceae
Order: Ectocarpales
Family: Chordariaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Zosterocarpus abyssicolus | W.R.Taylor, 1945 | pre-1946 | Post Office Bay, Floreana, Galapagos Islands, Ecuador | Missing | Access |