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Alokistocaridae
Alokistocaridae is a family of ptychopariid trilobites that lived from the Botomian epoch of the Early Cambrian until the Late Cambrian. Alokistocarids were particle feeders and left small furrows which are occasionally preserved.Coppold, Murray and Wayne Powell (2006). ''A Geoscience Guide to the Burgess Shale'', p.54. The Burgess Shale Geoscience Foundation, Field, British Columbia. . Their remains are found worldwide. ''Elrathia kingii'', one of the most collected trilobites in the world, is a typical alokistocarid. Description Alokistocarids have an exoskeleton that is elongated ovate to inverted egg-shaped. The headshield (or cephalon) is semicircular and has a well-defined border. The central raised area of the cephalon (or glabella) is somewhat tapering forward, generally with 3 or 4 pairs of more or less distinct lateral furrows. The front of the glabella is rounded or truncate, and is separated from the border by a wide, moderately convex to flat (or rarely concave) so- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ehmaniella
''Ehmaniella'' is a genus of trilobite known from the Middle Cambrian Burgess Shale. 392 specimens of ''Ehmaniella'' are known from the Greater Phyllopod bed, where they comprise 0.74% of the community. Ehmaniella's major characteristics are a wide cranidium, heavy eye ridges, longitudinal striae on the pre-glabellar area, and a small pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is com ... with few segments.Coppold, Murray and Wayne Powell (2006). ''A Geoscience Guide to the Burgess Shale'', p.56. The Burgess Shale Geoscience Foundation, Field, British Columbia. . References External links * Burgess Shale fossils Alokistocaridae Cambrian trilobites Cambrian genus extinctions {{Ptychopariida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ithyektyphus
''Ithyektyphus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Cambrian Period The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (m ..., which lasted from approximately 542 to 488 million years ago. References Alokistocaridae Cambrian trilobites Fossils of the United States {{ptychopariida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chancia (trilobite)
''For the commune in France, see Chancia.'' ''Chancia'' is an extinct genus of Cambrian trilobite. It was a "fast-moving epifaunal detritivore" from Canada (British Columbia, specifically Burgess Shale, and Newfoundland) and the United States (Idaho, Pennsylvania, Utah, and Vermont). ''Chancia'' was a particle feeder. Its major characteristics are a normal glabella but an enlarged cephalon due to a pre-glabellar field in front of the glabella, as well as developed eye ridges, medium-sized genal spines, and an extremely small pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is com ....Coppold, Murray and Wayne Powell (2006). ''A Geoscience Guide to the Burgess Shale'', p.57. The Burgess Shale Geoscience Foundation, Field, British Columbia. . References External links "Chancia p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychopariacea
Ptychoparioidea is a superfamily of the Ptychopariida order of trilobites.Pour M. G., Popov L. E. (2009) Silicified Middle Cambrian trilobites from Kyrgyzstan, Palaeontology, 1039-1056 Taxonomy *Family Acrocephalitidae *Family Alokistocaridae *Family Antagmidae *Family Asaphiscidae *Family Atopidae *Family Bolaspididae *Family Cedariidae *Family Changshaniidae *Family Conocoryphidae *Family Conokephalinidae *Family Crepicephalidae *Family Diceratocephalidae *Family Elviniidae *Family Eulomidae *Family Holocephalinidae *Family Ignotogregatidae *Family Inouyiidae *Family Isocolidae *Family Kingstoniidae *Family Liostracinidae *Family Llanoaspididae *Family Lonchocephalidae *Family Lorenzellidae *Family Mapaniidae *Family Marjumiidae *Family Menomoniidae *Family Nepeidae *Family Norwoodiidae *Family Papyriaspididae *Family Phylacteridae *Family Proasaphiscidae *Family Ptychopariidae *Family Shumardiidae *Family Solenopleurida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annamitia
''Annamitia'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Cambrian Period The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ..., which lasted from approximately 542 to 488 million years ago. References Ptychopariida genera Alokistocaridae Cambrian trilobites {{Ptychopariida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elrathina
Ptychoparioidea is a superfamily of the Ptychopariida order of trilobites.Pour M. G., Popov L. E. (2009) Silicified Middle Cambrian trilobites from Kyrgyzstan, Palaeontology, 1039-1056 Taxonomy *Family Acrocephalitidae *Family Alokistocaridae *Family Antagmidae *Family Asaphiscidae *Family Atopidae *Family Bolaspididae *Family Cedariidae *Family Changshaniidae *Family Conocoryphidae *Family Conokephalinidae *Family Crepicephalidae *Family Diceratocephalidae *Family Elviniidae *Family Eulomidae *Family Holocephalinidae *Family Ignotogregatidae *Family Inouyiidae *Family Isocolidae *Family Kingstoniidae *Family Liostracinidae *Family Llanoaspididae *Family Lonchocephalidae *Family Lorenzellidae *Family Mapaniidae *Family Marjumiidae *Family Menomoniidae *Family Nepeidae *Family Norwoodiidae *Family Papyriaspididae *Family Phylacteridae *Family Proasaphiscidae *Family Ptychopariidae *Family Shumardiidae *Family Solenopleuridae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elrathia
''Elrathia'' is a genus of trilobite belonging to Ptychopariacea known from the mid-Cambrian of Laurentia (North America). ''E. kingii'' is one of the most common trilobite fossils in the USA locally found in extremely high concentrations within the Wheeler Formation in the U.S. state of Utah. ''E. kingii'' has been considered the most recognizable trilobite. Commercial quarries extract ''E. kingii'' in prolific numbers, with just one commercial collector estimating 1.5 million specimens extracted in a 20-year career. 1950 specimens of ''Elrathia'' are known from the Greater Phyllopod bed, where they comprise 3.7% of the community. Etymology Even though the generic name ''Elrathia'' was first published in the combination ''E. kingii'', a species from the House Range, Utah, the name, itself, is derived from Elrath, Cherokee County, Alabama. Description ''E. kingii'' is a medium-sized trilobite with a smooth sub-ovate carapace that is tapered towards the rear. Thorax is usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychopariida
Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event. Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax. These sutures outline the cranidium, or the main, central part of the head that does not include the librigena (free cheeks). The eyes are medial along the glabella on the suture line (and some species have no eyes). The fossils of the moults of trilobites can often be told from the fossils of the actual animals by whether the librigena are present. (The librigena, or cheek spines, detach during moulting.) In ptychopariids, short bladelike genal spines are often present on the tips of the librigena. The thorax is large and is typically made up of eight or more segments. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
