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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] |
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] |
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] |
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] |
Bolbolenellus
''Bolbolenellus'' is an extinct genus of trilobites, fossil marine arthropods, with five species attributed to it currently. It can be easily distinguished from all other trilobites by the combination of the absence of dorsal sutures in the head shield like all Olenellina (which in all other trilobite suborders assist in moulding by splitting open), and a distinctly bulbous frontal lobe (L4) of the raised axial area in the head (or cephalon) called glabella. The species lived at the end of the Lower Cambrian. Etymology ''Bolbolenellus'' is the combination of Greek (, “plant with round swelling on underground stem”), and ''Olenellus'', the rather distantly related genus to which all of the species were previously assigned. This refers to the bulb-like swelling of the frontal lobe of the glabella. The names of the species have the following derivations. * ''B. altifrons'' from the Latin altus (“high”) and from Latin frons (“forehead”), to express the species has a ... [...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] |
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] |
Ben Peach
Benjamin Neeve Peach (6 September 1842 – 29 January 1926) was a British geologist. Life Peach was born at Gorran Haven in Cornwall on 6 September 1842 to Jemima Mabson and Charles William Peach, an amateur British naturalist and geologist. He was educated at the Royal School of Mines in London and then joined the Geological Survey in 1862 as a geologist, moving to the Scottish branch in 1867. He is best remembered for his work on the Northwest Highlands and Southern Uplands with his friend and colleague John Horne, where they resolved the long-running "Highlands Controversy" with their 1907 publication of ''The Geological Structure of the North-West Highlands of Scotland''. In 1881 he was elected a Fellow of the Royal Society of Edinburgh. His proposers were Archibald Geikie, Sir Charles Wyville Thomson, Peter Guthrie Tait and Robert Gray. He won the Society's Neill Prize for the period 1883–86. He served as the Society's Vice President from 1912 to 1917. He was electe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lincoln County, Nevada
Lincoln County is a County (United States), county located in the U.S. state of Nevada. As of the 2010 United States Census, 2010 census, the population was 5,345. Its county seat is Pioche, Nevada, Pioche. Like many counties in Nevada, it is dry and sparsely populated, though notable for containing the Area 51 government Air Force base. History Lincoln County was established in 1866 after Congress enlarged Nevada by moving its state line eastward and southward at the expense of Utah Territory, Utah and Arizona Territory, Arizona territories. It is named after Abraham Lincoln, the 16th President of the United States. Original legislation called for the creation of a "Stewart County", after Nevada Senator William M. Stewart, but this was later changed in a substitute bill. Crystal Springs, Nevada, Crystal Springs was the county's first county seat, seat in 1866, followed by Hiko, Nevada, Hiko in 1867, and Pioche, Nevada, Pioche in 1871. Lincoln County initially included a ranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inyo County, California
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 Nort ... [...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] |
Cephalon (arthropod Head)
The cephalon is the head section of an arthropod. It is a tagma, i.e., a specialized grouping of arthropod segments. The word cephalon derives from the Greek κεφαλή (kephalē), meaning "head". Insects In insects, ''head'' is a preferred term. The insect head consists of five segments, including three (the labial, maxillary and mandibular) necessary for food uptake, which are altogether known as the gnathocephalon and house the suboesophageal ganglion of the brain, as well as the antennal segment, and an ocular segment, as well as a non segmented fused section of the head where the archicerebrum is housed known as the acron. See also arthropod head problem. Chelicerates and crustaceans In chelicerates and crustaceans, the cephalothorax is derived from the fusion of the cephalon and the thorax, and is usually covered by a single unsegmented carapace. In relation with the arthropod head problem, phylogeny studies show that members of the Malacostraca class of cru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term ''cladus'' (plural ''cladi'') is often used in taxonomical literature. The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between organisms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
