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Trepassia wardae

Rangeomorpha

Taxonomy
Charnia wardi was named by Narbonne and Gehling (2003). It is a cast. Its type locality is Calvert Bay, oldest Ediacaran, which is in an Ediacaran submarine fan shale/sandstone in the Drook Formation of Canada. It is the type species of Trepassia.

It was recombined as Trepassia wardae by Narbonne et al. (2009).

Synonymy list
YearName and author
2003Charnia wardi Narbonne and Gehling pp. 515-517
2007Charnia wardi Laflamme et al.
2009Trepassia wardae Narbonne et al.

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RankNameAuthor
kingdomAnimalia()
orderRangeomorpha
RankNameAuthor
genusTrepassia
specieswardae(Narbonne and Gehling 2003)

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.

Diagnosis
ReferenceDiagnosis
M. Laflamme et al. 2007Very long, parallel-sided Charnia that distally narrows to an acute tip, with straight central ridge or furrow. Complete specimens typically with .10:1 length v. width ratios. Primary branching angle typically greater than 45 (average range between 44–74), with occasional acutely angled branch bundles (average range between 24–35).
G. M. Narbonne et al. 2009Rangeomorph frond that is parallel-sided and narrows to an acute tip, with straight central ridge or furrow. Primary and secondary branches emanate from a straight central axis or stalk in the petalodium, with tertiary branches arranged at an acute angle to the secondary branches. All branches show exclusively single-sided rangeomorph structure.