Keretsa
| Keretsa brutoni Temporal range: Ediacaran
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| Artist's reconstruction of K. brutoni as an arthropod, compared to individuals of Parvancorina | |
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| Genus: | Keretsa
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| Species: | K. brutoni
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| Keretsa brutoni Ivantsov, 2017[2]
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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 b c 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.