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Emigrantia
''Emigrantia'' is an extinct genus of trilobites, fossil marine arthropods, of small to average size. It lived during the Toyonian stage (last phase of the Upper ''Olenellus''-zone), in what is today the South-Western United States. ''Emigrantia'' can easily be distinguished from other trilobites by the sturdy but not inflated genal spines, that are attached at midlength of the cephalon, in combination with effaced features of the raised axial area of the head shield (or glabella). Etymology The name of the genus is derived from Emigrant Pass, Nopah Range, California, near the collection site of many of the last of the Lower Cambrian Olenellina. Description As with most early trilobites, ''Emigrantia'' has an almost flat exoskeleton, that is only thinly calcified. As part of the Olenellina suborder, ''Emigrantia'' lacks dorsal sutures. Like all other members of the Olenelloidea superfamily, the eye-ridges spring from the back of the frontal lobe (L4) of the central area of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biceratopsinae
The Biceratopsinae is an extinct subfamily of redlichiid trilobites within the family Biceratopsidae, with species of small to average size. Species belonging to this subfamily lived during the Toyonian stage (Upper ''Olenellus''-zone), 516-513 million years ago, in the former continent of Laurentia, including what are today the South-Western United States and Canada. Etymology The Biceratopsinae are named for the type species '' Biceratops nevadensis''. Habitat The Biceratopsinae were probably marine bottom dweller, like all Olenellina. References Cambrian trilobites Cambrian Series 2 first appearances Cambrian Series 2 extinctions Biceratopsidae Arthropod subfamilies {{Redlichiida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eopeachella
''Eopeachella'' is an extinct genus of trilobites, fossil marine arthropods, with species of probably small size (largest headshield (or cephalon) long), entire, articulate specimens have not yet been found. It lived during the Toyonian stage (Upper ''Olenellus''-zone), in what is today the South-Western United States. ''Eopeachella angustispina'' is the only known species in this genus (i.e. the genus is monotypic). Etymology ''Eopeachella'' is named for its early occurrence compared to and presumed closeness to ''Peachella''. The species epithet ''angustispina'' refers to the slender genal spines compared to those in the species of ''Peachella''. Description Only the cephalon of ''Eopeachella'' is known. It is a small sized biceratopsid trilobite, that exhibits the effaced cephalic features that are typical for that family. ''Eopeachella'' has short, stout genal spines, which are somewhat inflated at base and terminate in pointed tips and inflated lateral cephalic border ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peachella
''Peachella'' is an extinct genus of trilobites, fossil marine arthropods, with species of average size (about long). It lived during the Toyonian stage (Upper ''Olenellus''-zone), , in what is today the southwestern United States. It can easily be distinguished from other trilobites by its club-likgenal spines Etymology ''Peachella'' is named in honor of Benjamin Neeve Peach, a British geologist. The species epithet ''brevispina'' is derived from Latin and means 'short spine'. ''P. iddingsi'' was named in honor of Joseph P. Iddings, an accomplished American geologist. Origin The earliest occurrence of the ancestral '' Eopeachella angustispina'' predates both ''Peachella'' species, its latest occurrence overlaps with ''P. iddingsi'', which, in turn overlaps with ''P. brevispina''. ''E. angustispina'' has thick, tapered, blunt, genal spines and shallow but clear glabellar furrows. This species therefore bridges the morphological gap between the derived ''Peachella'' species an ... [...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] |
Trilobite Zone
Trilobites are used as index fossils to subdivide the Cambrian period. Assemblages of trilobites define trilobite zones. The ''Olenellus''-zone has traditionally marked the top of the Lower Cambrian, and is followed by the '' Eokochaspis'' zone. The last two zones of the Middle Cambrian are the '' Bathyuriscus– Elrathina''-zone (contemporaneous with the Burgess Shale) and the subsequent '' Bolaspidella''-zone (starting at the base of the Drumian stage). These are overlain by the lowermost Upper Cambrian ''Cedaria''-zone. Alternative zoning names place the Burgess Shale in the ''Peronopsis bonnerensis''-zone, which is underlain by the ''Oryctocephalus indicus''-zone (e.g. Spence Shale) and overlain (perhaps not directly) by the ''Ptychagnostus punctuosus''-zone. The lower Middle Cambrian '' Glossopleura''-zone (Spence Shale) is above the '' Albertella''-zone. The '' Elvinia''-zone is upper Cambrian. Subdivision of the ''Olenellus''-zone Recently, it has been proposed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Trilobites
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 (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inyo County
Inyo County () is a county in the eastern central part of the U.S. state of California, located between the Sierra Nevada and the state of Nevada. In the 2020 census, the population was 19,016. The county seat is Independence. Inyo County is on the east side of the Sierra Nevada and southeast of Yosemite National Park in Central California. It contains the Owens River Valley; it is flanked to the west by the Sierra Nevada and to the east by the White Mountains and the Inyo Mountains. With an area of 10,192 square miles (26,397 km2), Inyo County is the second-largest county by area in California, after San Bernardino County. Almost one-half of that area is within Death Valley National Park. However, with a population density of 1.8 people per square mile, it also has the second-lowest population density in California, after Alpine County. History Present-day Inyo county has been the historic homeland for thousands of years of the Mono, Timbisha, Kawaiisu, and Northe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nopah Range
The Nopah Range is a mountain range located in Inyo County, California, United States, near the eastern border with Nevada. Geography The mountain range lies east of the adjacent Resting Spring Range, the Owlshead Mountains and lower Death Valley, and are north of the Kingston Range. The Amargosa River is to the west. They are located directly east of Shoshone, California, and the Chicago Valley, northeast of Tecopa, California, southwest of Pahrump, Nevada, and west of Las Vegas, Nevada. The Nopah Range reaches an elevation of 6,395 feet above sea level at Nopah Peak, in the center of the range. The Nopah Range is approximately 26 miles long. Wilderness The Nopah Range Wilderness consists of 106,623 acres of the mountain range. Established in 1994 by the U.S. Congress, the wilderness area is managed by the U.S. Bureau of Land Management. Elevations range from 1,800 feet (548 m) to 6,395 feet (1949 m). The South Nopah Range Wilderness includes 17,059 acres of lower elevation fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Paleontology
The ''Journal of Paleontology'' is a peer-reviewed scientific journal covering the field of paleontology. It is published by the Paleontological Society. Indexing The ''Journal of Paleontology'' is indexed in: *BIOSIS Previews *Science Citation Index *The Zoological Record *GeoRef __NOTOC__ The GeoRef database is a bibliographic database that indexes scientific literature in the geosciences, including geology. Coverage ranges from 1666 to the present for North American literature, and 1933 to the present for the rest of t ... References Paleontology journals Publications established in 1927 Academic journals published by learned and professional societies Cambridge University Press academic journals Bimonthly journals Paleontological Society {{paleo-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biceratops
''Biceratops'' is an extinct genus of olenelloid redlichiid trilobites, of average size, with the largest specimen long, not including the huge pleural spines of the 3rd segment of the thorax. It lived during the Toyonian stage (last phase of the Upper ''Olenellus''-zone), in what is today the South-Western United States. ''Biceratops'' can easily be distinguished from other members of Biceratopsidae by the absence of genal spines, in combination with effaced features of the raised axial area of the head shield (or glabella), that is bordering the two horn-like projections that carry the eyes. ''Biceratops nevadensis'' is the only known species in this genus (i.e. the genus is monotypic). Etymology The name of the genus is derived from Latin and means ‘two horned-eyes’. The species epithet refers to the US state where it was collected. Description As with most early trilobites, ''Biceratops'' has an almost flat exoskeleton, that is only thinly calcified. It also shares ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exoskeleton
An exoskeleton (from Greek ''éxō'' "outer" and ''skeletós'' "skeleton") is an external skeleton that supports and protects an animal's body, in contrast to an internal skeleton (endoskeleton) in for example, a human. In usage, some of the larger kinds of exoskeletons are known as " shells". Examples of exoskeletons within animals include the arthropod exoskeleton shared by chelicerates, myriapods, crustaceans, and insects, as well as the shell of certain sponges and the mollusc shell shared by snails, clams, tusk shells, chitons and nautilus. Some animals, such as the turtle, have both an endoskeleton and an exoskeleton. Role Exoskeletons contain rigid and resistant components that fulfill a set of functional roles in many animals including protection, excretion, sensing, support, feeding and acting as a barrier against desiccation in terrestrial organisms. Exoskeletons have a role in defense from pests and predators, support and in providing an attachment framework f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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