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Trilobozoan
''Trilobozoa'' (meaning "three-lobed animals") is a phylum of extinct mobile animals that were originally classified into the Cnidaria. The basic body plan of ''Trilobozoa'' is often a tri-radial 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 Fedonkin and Runnegar presumed that there were 2-3 families within the Trilobozoa, those families being Albumaresidae Fedonkin, 1985 and Tribrachididae Runnegar, 1992. Although, affinities with the Conulariida were made because of the conulariids possessing similar three-fold symmetry. Mikhail Fedonkin later classified the Trilobozoa as a class of the Phylum Coelenterata. Most of the members of what is now the modern day classification for Trilobozoa were thought to have originally been free swimming Jellyfish. Tribrachidium was once interpreted as a Edrioasteroid Echinoderm, although wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumares
''Albumares brunsae'' is a tri-radially symmetrical fossil animal that lived in 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 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 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. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylum (biology)
In biology, a phylum (; plural: phyla) is a level of classification or taxonomic rank below kingdom and above class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature for algae, fungi, and plants accepts the terms as equivalent. Depending on definitions, the animal kingdom Animalia contains about 31 phyla, the plant kingdom Plantae contains about 14 phyla, and the fungus kingdom Fungi contains about 8 phyla. Current research in phylogenetics is uncovering the relationships between phyla, which are contained in larger clades, like Ecdysozoa and Embryophyta. General description The term phylum was coined in 1866 by Ernst Haeckel from the Greek (, "race, stock"), related to (, "tribe, clan"). Haeckel noted that species constantly evolved into new species that seemed to retain few consistent features among themselves and therefore few features that distinguished them as a group ("a self-contained uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumares Brunsae
''Albumares brunsae'' is a tri-radially symmetrical fossil animal that lived in 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 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 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. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edrioasteroid
Edrioasteroidea is an extinct class (biology), class of echinoderms. The living animal would have resembled a pentamerously symmetrical disc or cushion. They were obligate encrusters and attached themselves to inorganic or biologic hard substrates (frequently hardgrounds or brachiopods). A 507 million years old species, Totiglobus spencensis, is actually the first known echinoderm adapted to live on a hard surface after the soft microbial mats that covered the seafloor were destroyed in the Cambrian substrate revolution. The oldest undisputed fossils of Edrioasteroidea are known from Cambrian (Cambrian Stage 3, Stage 3, about 515-520 Megaannum, Ma ago) of Laurentia and are among the oldest known fossils of echinoderms. Some authors propose that an enigmatic Ediacaran (about 600 Ma) organism ''Arkarua'' is also an edrioasteroid, but this interpretation did not gain wide acceptance. Last edrioasteroids are known from Permian (Late Kungurian, about 270-280 Ma). Anatomy The body plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobozoa
''Trilobozoa'' (meaning "three-lobed animals") is a phylum of extinct mobile animals that were originally classified into the Cnidaria. The basic body plan of ''Trilobozoa'' is often a tri-radial 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 Fedonkin and Runnegar presumed that there were 2-3 families within the Trilobozoa, those families being Albumaresidae Fedonkin, 1985 and Tribrachididae Runnegar, 1992. Although, affinities with the Conulariida were made because of the conulariids possessing similar three-fold symmetry. Mikhail Fedonkin later classified the Trilobozoa as a class of the Phylum Coelenterata. Most of the members of what is now the modern day classification for Trilobozoa were thought to have originally been free swimming Jellyfish. Tribrachidium was once interpreted as a Edrioasteroid Echinoderm, although wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastrovascular System
The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Coelenterates or cnidarians (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals. In cnidarians, the gastrovascular system is also known as the coelenteron, and is commonly known as a "blind gut" or "blind sac", since food enters and waste exits through the same orifice. The radially symmetrical cnidarians have a sac-like body in two distinct layers, the epidermis and gastrodermis, with a jellylike layer called the mesoglea between. Extracellular digestion takes place within the central cavity of the sac-like body. This cavity has only one opening to the outside which, in most cnidarians, is surrounded by tentacle In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaeophragmodictya
''Palaeophragmodictya'' is an extinct genus of sponge-grade organisms from the Ediacaran Period. Originally interpreted as a hexactinellid sponge, the organism also bears some coelomate characteristics, including bilateral symmetry. Morphology The organisms take the form of a rounded, dome-like bag, 7–68 mm in diameter, with an uneven margin. Radial grooves define sac-like compartments within the bag. The radial pattern has an element of bilateral symmetry. A stalk emerges from the central point of some specimens, at the top of the organism; in life, it probably extended into the water column. Ray-like filaments radiate outwards from the edge of the bag. Some structures in the organism have been interpreted as spicules. Ecology The organisms have been interpreted as tall suspension feeders, reaching 10 cm or more up into the sea water above them. Original description The genus was originally considered to be a member of the Dictyospongiidae family (hexactin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mary Julia Wade
Mary Julia Wade (3 February 1928 – 14 September 2005) was an Australian palaeontologist, known for her role as the Deputy Director of the Queensland Museum. Some of her most renowned work was on the Precambrian Ediacaran Biota in South Australia. Wade was born in Adelaide, South Australia and spent her early life on a property in the northeast of the state. She lived the typical country girl's life, it is said. Her family moved when she was seven to Thistle Island in Spencer Gulf where she first became interested in geology. She studied geology and biology at the University of Adelaide, and in 1954 completed a Bachelor of Science with Honors in Micropalaeontology. Wade worked as a Senior Demonstrator at the University, while completing her Doctorate of Philosophy in 1959. Studying remotely via correspondence, Wade was sent on scholarship to the Wilderness School in Adelaide as a boarder from the age of 13. After she finished school, she undertook a Bachelor of Science in Geol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benthic
The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from ancient Greek, βένθος (bénthos), meaning "the depths." Organisms living in this zone are called benthos and include microorganisms (e.g., bacteria and fungi) as well as larger invertebrates, such as crustaceans and polychaetes. Organisms here generally live in close relationship with the substrate and many are permanently attached to the bottom. The benthic boundary layer, which includes the bottom layer of water and the uppermost layer of sediment directly influenced by the overlying water, is an integral part of the benthic zone, as it greatly influences the biological activity that takes place there. Examples of contact soil layers include sand bottoms, rocky outcrops, coral, and bay mud. Description Oceans The benthic region of the ocean begins at the shore line (intertidal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Territory
The Northern Territory (commonly abbreviated as NT; formally the Northern Territory of Australia) is an states and territories of Australia, Australian territory in the central and central northern regions of Australia. The Northern Territory shares its borders with Western Australia to the west (129th meridian east), South Australia to the south (26th parallel south), and Queensland to the east (138th meridian east). To the north, the territory looks out to the Timor Sea, the Arafura Sea and the Gulf of Carpentaria, including Western New Guinea and other islands of the Indonesian archipelago. The NT covers , making it the third-largest Australian federal division, and List of country subdivisions by area, the 11th-largest country subdivision in the world. It is sparsely populated, with a population of only 249,000 – fewer than half as many people as in Tasmania. The largest population center is the capital city of Darwin, Northern Territory, Darwin. The archaeological hist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Skinner, Northern Territory
__NOTOC__ Anmatjere is a locality in the Northern Territory of Australia located about south of the territory capital of Darwin. History The locality was named after the former Anmatjere Community Government Council, whose seat was located in the town of Ti-Tree. Its boundaries and name were gazetted on 4 April 2007. Governance and demographics Anmatjere is located within the federal division of Lingiari, the territory electoral division of Stuart and the local government areas of the Barkly Shire and the Central Desert Region. The 2016 Australian census reports that Anmatjere had 477 people living within its boundaries, of whom 47.3% were male, 52.7% were female and 87.9% identified as Aboriginal and/or Torres Strait Islander people. Sites and attractions The following sites located within Anmatjere are listed on the Northern Territory Heritage Register: * Aileron Homestead No. 1 * Alcoota Fossil Beds *Anna's Reservoir Conservation Reserve * Old Mount Riddock Homestead ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jack Sepkoski
Joseph John Sepkoski Jr. (July 26, 1948 – May 1, 1999) was a University of Chicago paleontologist. Sepkoski studied the fossil record and the diversity of life on Earth. Sepkoski and David Raup contributed to the knowledge of extinction events. They suggested that the extinction of dinosaurs 66 mya was part of a cycle of mass extinctions that may have occurred every 26 million years. Life and work Sepkoski was born in Presque Isle, Maine. In 1970, Sepkoski received a B.S. degree, magna cum laude, from the University of Notre Dame. Under Stephen Jay Gould he earned a Ph.D. in geological sciences from Harvard University in 1977. His Ph.D. was on the field geology and paleontology of the Black Hills of South Dakota. From 1974 to 1978, Sepkoski taught at the University of Rochester. In 1978 he joined the University of Chicago and became a professor in 1986. Sepkoski was also a research associate at the Field Museum of Natural History in Chicago. He died of heart failure relat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
