Albumares
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Albumares brunsae Temporal range: Ediacaran, between 558–555 Ma |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Trilobozoa Fedonkin, 1985 |
| Family: | Albumaresidae Fedonkin, 1985 |
| Genus: | Albumares Fedonkin, 1976 |
| Species: | A. brunsae |
Albumares brunsae is a tri-radially symmetrical fossil animal that lived in the late Ediacaran (Vendian) seafloor. It is a member of the extinct group Trilobozoa.
The generic name Albumares derives from the Latin Mare Album (White Sea). The specific name honors Elizabeth P. Bruns, an early 20th-century Russian geologist noted for her extensive and important research of the Upper Precambrian stratigraphy of European Russia.
Fossils of the Albumares brunsae are known from deposits on the Verkhovka formation on the Syuzma River in the Onega Peninsula of the White Sea, Arkhangelsk Region, Russia. There are reports about Albumares sp. from the Rawnslay Quartzite, Flinders Ranges in the South Australia, but photographs or description of these fossils have not yet been published.
Albumares fossils are preserved as negative, low impressions on the bases of sandstone beds. The fossil exhibits circular, trefoil-like (three-lobe) form, and is covered by three dendritic-branched furrows and three oval ridges that radiate from the center. The lobes are twisted into weak spirals.
The diameters of known specimens vary from 8 to 15 millimeters.
Albumares was originally described by Mikhail Fedonkin as a free-swimming scyphozoan jellyfish. The branched furrows on the fossil were interpreted as imprints of a system of internal radial canals and tentacles along the outer margin of the fossil, with the three oval ridges described as imprints of mouth lobes or gonades.
Later, with the discovery of the closely related Anfesta and with their seeming affinities to Tribrachidium, Fedonkin appointed these animals to the Trilobozoa , an extinct group of the tri-radially symmetrical coelenterate-like animals that only superficially resembled cnidarians. Originally, Trilobozoa was established as a class in the phylum Coelenterata, but since Coelenterata has been divided into two separate phyla, Cnidaria and Ctenophora, Trilobozoa itself has been promoted to the rank of phylum.
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