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Vernanimalcula
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Vernanimalcula guizhouena is an acritarch dating from 600 to 580 million years ago; it was between 0.1 and 0.2 mm across. Vernanimalcula means "small spring animal", referring to its appearance in the
A depiction of Vernanimalcula as a bilaterian.
A depiction of Vernanimalcula as a bilaterian.
Bilateria
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Bilateria is a large clade of animals characterised by bilateral symmetry during embryonic development. This means their body plans are laid around a longitudinal axis with a front and a rear end, as
Vernanimalcula
…a differentiated gut, a mouth, an anus, and paired external pits that were believed possible sense organs, making it the earliest known member of the Bilateria (animals with bilateral symmetry, at least as embryos). The appearance of Vernanimalcula so early in the fossil record was believed to have had important…
EB1911 Crustacea Fig. 12.—Nauplius of a Prawn
EB1911 Crustacea Fig. 12.—Nauplius of a Prawn
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.