How Wide Was Tribrachidium heraldicum? 5 cm Compared

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Tribrachidium was an Ediacaran organism with a distinctive three-lobed body arranged in near-perfect threefold symmetry.

Source: South Australian Museum, “Tribrachidium”; University of California Museum of Paleontology, “Tribrachidium”

Prehistoric Life

Name	Size	Compared with Tribrachidium heraldicum
Elrathia kingi	2 cm (0.79 in)	0.4×
Marrella splendens	2.5 cm (0.98 in)	0.5×
Eldredgeops rana	5 cm (1.97 in)	same size
Pikaia gracilens	5 cm (1.97 in)	same size
Titanomyrma giganteum	5 cm (1.97 in)	same size
Tribrachidium heraldicum	5 cm (1.97 in)	this page
Cooksonia pertoni	6.5 cm (2.56 in)	1.3×
Ottoia prolifica	8 cm (3.15 in)	1.6×
Olenoides serratus	10 cm (3.94 in)	2×
Dickinsonia costata	14 cm (5.51 in)	2.8×

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Which is bigger: Tribrachidium heraldicum or Cooksonia pertoni?

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