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Trepassia was named by Narbonne et al. (2009) [Previously Charnia]. Its type is Trepassia wardae.

It was assigned to Rangeomorpha by Erwin et al. (2011) and Brasier et al. (2012).

Synonymy list
YearName and author
2009Trepassia Narbonne et al. pp. 515-517 fig. 10
2011Trepassia Erwin et al. pp. Table S5
2012Trepassia Brasier et al. p. 1114

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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

M. D. Brasier et al. 2012Frond unipolar, comprising two rows of irregularly spaced primary branches arranged along a furled central axis, commonly forming a linear suture (Figs 4C–D and 8H). Inflation of first-order branches is moderate with no clear direction, while that of second-order branches is mainly medial. Alignments of first-order branches are subparallel. Those of second- and third-order branches within a single specimen are more irregular and range gradually or switch abruptly from subparallel to distinctly radiate. Mature first- to third-order branches have furled margins, with rangeomorph elements that are rotated and undisplayed. A basal disc is sometimes preserved.