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Trilobozoa
Trilobozoa, from Ancient Greek τρεῖς (''treîs''), meaning "three", λοβός (''lobós''), meaning "lobe", and ζῷον (''zôion''), meaning "animal", is a phylum of extinct, sessile animals that were originally classified into the Cnidaria. The basic body plan of trilobozoans is often a triradial or radial sphere-shaped form with lobes radiating from its centre. Fossils of trilobozoans are restricted to marine strata of the Late Ediacaran period. History and interpretations Originally, both Mikhail A. Fedonkin, M.A. Fedonkin and B.N. Runnegar presumed that there were 2–3 families within the Trilobozoa, those families being Albumaresidae and Tribrachididae . Although, affinities with the Conulariida were made because the conulariids possess similar three-fold symmetry. Mikhail A. Fedonkin, Fedonkin originally classified the Trilobozoa as a class of the Phylum (biology), phylum Coelenterata. Most of the members of what is now the modern day classification for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tribrachidium
''Tribrachidium heraldicum'' is a tri-radially symmetric fossil animal that lived in the late Ediacaran (Vendian) seas. In life, it was hemispherical in form. ''T. heraldicum'' is the best known member of the extinct group Trilobozoa. Etymology The generic name ''Tribrachidium'' is derived from combination of the (, "three") + ("arm") + diminutive suffix . The specific name ''T. heraldicum'' references the similarity of the pattern of this fossil with the well-known heraldic triskelion design, such as the coat of arms of the Isle of Man. Occurrence ''Tribrachidium'' fossils were first discovered in the Ediacara Member of the Rawnslay Quartzite, Flinders Ranges in South Australia. This fossil is also known from the Mogilev Formation in the Dniester River Basin, Podolia, Ukraine and from the Verkhovka, Zimnegory and Yorga formations in the White Sea area of the Arkhangelsk Region, Russia. This fossil is also known from the Sonia Formation of Marwar Supergroup near Jodhpur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumares Crop
''Albumares brunsae'' is a tri-radially symmetrical fossil animal that lived on the late Ediacaran seafloor. It is a member of the extinct group Trilobozoa. Etymology The generic name ''Albumares'' derives from the Latin ''Mare Album'' (White Sea). The specific name "brunsae" 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. Occurrence Fossils of ''Albumares brunsae'' are known from deposits in the Verkhovka Formation, Syuzma River in the Onega Peninsula of the White Sea, Arkhangelsk Region, Russia. There are reports of ''Albumares'' sp. from the Rawnslay Quartzite, Flinders Ranges in South Australia, but photographs or description of these fossils have not yet been published. Description ''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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anfesta
''Anfesta stankovskii'' is a tri-radially symmetrical fossil animal that lived on the late Ediacaran (Vendian) seafloor. It is a member of the extinct group Trilobozoa. Etymology The generic and specific names of ''Anfesta stankovskii'' honour the Arkhangel'sk geologist Anatoliy F. Stankovskii. Occurrence Fossils of ''Anfesta stankovskii'' are known from deposits of the Verkhovka and Yorga formations on the Karakhta River in Onega Peninsula and Zimnii Bereg (Winter Coast) of the White Sea, Arkhangelsk Region, Russia. Description ''Anfesta'' represents a flattened, hemispherical form with three-fold symmetry. At the centre of the organism, 3 elongate and sausage-like lobes radiate from the centre and are spaced out from each other by 120 degrees, making the animal always divisible into 3 parts and the lobes becoming rounded at both edges. The same lobes bifurcate twice near both of their ends. In some specimens of ''A. stankovskii'', a large amount of furrows (originally int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rugoconites
''Rugoconites'' is a genus of Ediacaran biota found as fossils in the form of a circular or oval-like impression preserved in high relief, six or more centimeters in diameter. The fossils are surrounded by frills that have been interpreted ( Wade 1972) as sets of tentacles. The bifurcating radial ribs, spreading from a central dome, serve to distinguish this genus from the sponge '' Palaeophragmodictya'', and may represent the channels of the gastrovascular system. Fossils of ''Rugoconites'' have been interpreted as early sponges, although this is countered by Sepkoski ''et al.'' (2002), who interpreted the organism as a free-swimming jellyfish-like cnidarian; similar to '' Ovatoscutum''. However, the fossil is consistently preserved as a neat circular form and its general morphology does not vary, therefore a benthic and perhaps slow-moving or sessile lifestyle is more likely. Ivantstov & Fedonkin (2002), suggest that ''Rugoconites'' may possess tri-radial symmetry and be a mem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hallidaya
The Ediacaran fossil ''Hallidaya'', a close relative of ''Skinnera'' lived in Belomorian (559-550 Ma) of the Late Ediacaran period prior to the Cambrian explosion and thrived in the marine strata on the ocean floor of what is now considered Australia. These fossils were disk-shaped organisms that were slightly dome shaped with tri-radial symmetry. These Ediacaran organisms thrived by living in low-energy inner shelf, in the wave- and current-agitated shoreface, and in the high-energy distributary systems. Description The ''Hallidaya'' is a species of trilobozoan which has the shape of small circular-shaped fossils preserved as a mold. They are soft-bodied creatures approximately in diameter with an average of with a height of shaped like a dome. They have three central depressions that are connected to smaller pouch-shaped depressions around the perimeter of the disk by canals. The center depressions are speculated to be their stomach. Environmental conditions During the B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
