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Trepassia wardae is a 579 million-year-old fossil of Ediacaran Rangeomorph. It was first discovered by Guy M. Narbonne, a professor at Queen's University in Ontario, Canada and colleagues in 2009. Three years later, Martin D. Brasier added additional description to Trepassia. Its name is taken from the French word which translates to "those that have departed forever" and honors the Trepassey community in Newfoundland.

Morphology
Trepassia is one of the oldest known rangeomorphs and spanned over one meter in length. It is a long and slender rangeomorph, its structure consists of single-sided branches with both primary and secondary branches rising from a central stalk. The primary branches were capable of minor pivoting as shown in the bundles of secondary branches. The adult specimens of Trepassia had substantial thickness, shown by the cylindrical cross-section of the frond.

The suspension-feed strategy of Trepassia wardae was that it used its long, slender petalodium for continuous feeding at all heights above the sea floor. Trepassia is believed to have reproduced asexually. Taller organisms were surrounded by large clusters of offspring. It grew by addition of new branches at the tip of the frond. There may be a link between its mode of reproduction and its large body size.

Distribution
Trepassia is found in Spaniard's Bay on the Avalon Peninsula of Newfoundland and in Mistaken Point Ecological Reserve in Newfoundland, Canada. Trepassia has only been found in Newfoundland.