Albumares brunsae
- 演化之聲
- Mar 18
- 2 min read
Age
Ediacaran
558-555 Ma
Taxonomy
Kingdom: Animalia
Phylum: Trilobozoa
Order: Aspidellomorpha
Family: Tribrachididae
Genus: Albumares
Species: Albumares brunsae
Morphological description
Albumares brunsae is a soft-bodied organism preserved as a positive relief fossil, exhibiting a tri-radial symmetry. The body is circular to subcircular, flattened with a low-relief profile, and composed of three evenly spaced protruding arms (also referred to as rays) radiating from the center toward the outer margin. Each arm tapers outward and is arranged in a counterclockwise spiral pattern.
Each arm bears three fine ridges and undergoes four successive bifurcations, producing dichotomous branching structures. The distal ends of the arms terminate in slender ridge-like extensions. The entire dorsal surface is covered with fine ridged textures, while the outer margin displays numerous tentacle-like ridges arranged along the perimeter.
The organism is generally small in size. Specimens from the White Sea region of Russia and the Ediacara Hills of South Australia typically range from 8 to 15 mm in diameter. However, in 2023, specimens discovered in India were reported with diameters of 60 and 65 mm, representing unusually large individuals compared to those from other regions.
Etymology
albumares: from Latin mare album, meaning 'White Sea'
brunsae: in honor of the Russian geologist Elizabeth P. Bruns
Biological description
Albumares brunsae is a tri-radially symmetrical organism from the Ediacaran Period, assigned to the extinct phylum Trilobozoa. It was first discovered on the Onega Peninsula in the White Sea region of Russia and has also been found in the Ediacara Hills of South Australia. More recently, fossils have been reported from the Marwar Supergroup in Rajasthan, India, providing paleogeographic evidence that India and Australia were connected during the late Ediacaran.
After death, the organism was rapidly buried and slightly compressed, forming low-relief fossils. This preservation suggests a benthic lifestyle in shallow marine environments. Fossils from different regions, including the White Sea and Ediacara Hills, show consistent preservation patterns and are commonly associated with typical Ediacaran taxa such as Aspidella and Hiemalora.
（Author: Shui-Ye You）
References
Keller BM and Fedonkin MA. (1976). New Records of Fossils in the Valdaian Group of the Precambrian on the Syuz'ma River. Seriya Geologicheskaya.
Parihar VS et al. (2023). Trilobozoan (Tribrachidium and Albumares) Ediacaran Organisms from Marwar Supergroup, Western India. Current Science.
64.76, 38.86
-30.80, 138.17
26.24, 73.02
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