''Trepassia'' is a 579 million-year-old fossil of

Ediacaran The Ediacaran Period ( ) is a geological period that spans 96 million years from the end of the Cryogenian Period 635 million years ago (Mya), to the beginning of the Cambrian Period 538.8 Mya. It marks the end of the Proterozoic Eon, and t ...

rangeomorph The rangeomorphs are a form taxon of frondose Ediacaran fossils that are united by a similarity to ''Rangea''. Some researchers, such as Pflug and Narbonne, suggest that a natural taxon Rangeomorpha may include all similar-looking fossils. Rang ...

. 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.'' The generic name is taken from the French word, trépassés, which translates to "those that have departed forever" (or "corpses") and honors the

Trepassey Trepassey () is a small fishing community located in Trepassey Bay on the south eastern corner of the Avalon Peninsula of Newfoundland and Labrador. It was in Trepassey Harbour where the flight of the ''Friendship'' took off, with Amelia Earhart ...

community in Newfoundland. It was originally described as ''

Charnia ''Charnia'' is a genus of frond-like lifeforms belonging to the Ediacaran biota with segmented, leaf-like ridges branching alternately to the right and left from a zig-zag medial suture (thus exhibiting glide reflection, or opposite isometry). T ...

wardi''; it was referred under this synonym in a 2016 paper.

Morphology

''Trepassia'' is one of the oldest known rangeomorphs and spanned over one meter in length. Longest specimens of ''T. wardae'' reached .M. LAFLAMME, G. M. NARBONNE, C. GREENTREE & M. M. ANDERSON. 2016. Morphology and taphonomy of an Ediacaran frond: Charnia from the Avalon Peninsula of Newfoundland. Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6. 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 Spaniard's Bay is a town in the Canadian province of Newfoundland and Labrador. It is located on the northwest side of Conception Bay and consists of Vokey's Shore, Northern Cove, Mint Cove, Green Head, and Goddenville. The name Spaniard's Bay c ...

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

Newfoundland Newfoundland and Labrador (; french: Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region ...

References

{{Taxonbar, from=Q51077157 Fossils Rangeomorpha