Keretsa

Keretsa brutoni; Temporal range: Ediacaran; ~
Scientific classification
Kingdom:	Animalia
(unranked):	Bilateria
Phylum:	incertae sedis (?Arthropoda) (?Proarticulata)
Genus:	Keretsa
Species:	K. brutoni
Binomial name
	Keretsa brutoni; Ivantsov, 2017

Artist's reconstruction of *K. brutoni* as an arthropod, compared to individuals of *Parvancorina* source ↗

Keretsa brutoni is a fossil bilaterian from the Late Precambrian-aged Zimnie Gory Formation near Arkhangelsk Oblast, Russia, along the Winter coast of the White Sea. The first specimens were found in 2005.² This rounded oblong-shaped organism resembles Naraoia, in having its body divided into an anteriorly positioned headshield, and a trunkshield. A pair of antennae-like structures emanate from underneath the base of the headshield, and there are numerous oblique grooves along the trunkshield that suggest legs.²

References

A.Yu. Ivantsov (2017). "The most probable Eumetazoa among late Precambrian macrofossils". Invertebrate Zoology. 14 (2): 132. doi:10.15298/invertzool.14.2.05. The trunk axial part of Keretsa specimen is wrinkled, and we can not prove either an opposite or an alternate (as in the Proarticulata) arrangement of the half-segments.
A.Yu. Ivantsov (2017). "The most probable Eumetazoa among late Precambrian macrofossils". Invertebrate Zoology. 14 (2): 127–133. doi:10.15298/invertzool.14.2.05.

[Ivantsov2017a-1] A.Yu. Ivantsov (2017). "The most probable Eumetazoa among late Precambrian macrofossils". Invertebrate Zoology. 14 (2): 132. doi:10.15298/invertzool.14.2.05. The trunk axial part of Keretsa specimen is wrinkled, and we can not prove either an opposite or an alternate (as in the Proarticulata) arrangement of the half-segments.

[Ivantsov2017-2] A.Yu. Ivantsov (2017). "The most probable Eumetazoa among late Precambrian macrofossils". Invertebrate Zoology. 14 (2): 127–133. doi:10.15298/invertzool.14.2.05.

1

2