Keretsa

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]

Keretsa brutoni
Temporal range: Ediacaran
~555 Ma
↓
Artist's reconstruction of K. brutoni as an arthropod, compared to individuals of Parvancorina
Scientific classification
Kingdom:
Animalia
(unranked):
Bilateria
Phylum:
incertae sedis (?Arthropoda) (?Proarticulata[1])
Genus:
Keretsa
Species:
K. brutoni
Binomial name
Keretsa brutoni
Ivantsov, 2017[2]

References
  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.
  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.
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