|
Holmia (trilobite)
''Holmia'' is a genus of a well known group of extinct arthropods, the trilobites, that lived during the Lower Cambrian (Atdabanian) in what are now Scandinavia, Poland and Morocco. Etymology ''Holmia'' is the Latin name for Stockholm, in the neighborhood of which early finds of this trilobite were collected. ''H. kjerulfi'' was named in honor of the Norwegian geologist and paleontologist Theodor Kjerulf Theodor Kjerulf (30 March 182525 October 1888) was a Norwegian geologist and professor at the University of Oslo. He also served as director of the Norwegian Geological Survey. Biography He was born in Christiania (now Oslo), Norway. He was the .... Taxonomy Species previously assigned to ''Holmia'' * ''H. hyperborea'' = '' Mesolenellus hyperborea'' * ''H. ljungneri'' = '' Fallotaspis ljungneri'' * ''H. lundgreni'' = '' Elliptocephala lundgreni'' * ''H. macer'' = '' Mummaspis macer'' * ''H. mickwitzi'' = '' Schmidtiellus mickwitzi'' * ''H. mirabilis'' = '' Ellipto ... [...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] |
Mesolenellus
''Mesolenellus'' is an extinct genus of trilobites that lived during the lower Cambrian (Botomian), found in Greenland and Spitsbergen. Etymology ''Mesolenellus'' is a contraction of meso - middle - and ''Olenellus'', the genus from which it was split off. The epithet ''hyperborea'' is a contraction of hyper (Greek ὑπέρ "excess") and Boreas ( el, Βορέας), god of the North Wind in Greek mythology, referencing the current geographical position of the deposits of its type location. ''M. svalbardensis'' has been named for the Norwegian island group Svalbard or Spitsbergen, where it was originally collected. Taxonomy It was considered a subgenus of ''Olenellus ''Olenellus'' is an extinct genus of redlichiid trilobites, with species of average size (about long). It lived during the Botomian and Toyonian stages (''Olenellus''-zone), , in what is currently North-America, part of the palaeocontinent Lau ...'' before. The nearest relatives of ''Mesolenellus'' are the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holmia Kjerulfi Cephalon
Holmia may refer to: * Holmia (Cilicia), a town of ancient Cilicia, now in Turkey * Holmia, the Latin name of Stockholm * Holmia, a residential area in the centre of Stockholm, on the island Kungsholmen * Holmia, the vernacular name of Holmium(III) oxide Holmium(III) oxide, or holmium oxide is a chemical compound of a rare-earth element holmium and oxygen with the formula Ho2O3. Together with dysprosium(III) oxide (Dy2O3), holmium oxide is one of the most powerfully paramagnetic substances known. ... * 378 Holmia, an asteroid * ''Holmia'' (trilobite), a trilobite belonging to the Olenellina suborder {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Esmeraldina
''Esmeraldina'' is an extinct genus of holmiid trilobites. It lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of 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 .... References Cambrian trilobites Olenelloidea {{Redlichiida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schmidtiellus
''Schmiditellus'' is an extinct genus of holmiid trilobites from the Cambrian of Poland. As of 2017, a ''Schmidtiellus reetae'' fossil from 530 mya, collected in Saviranna in northern Estonia, is the oldest known fossilized eye. The structure is similar to the compound eyes of modern-day dragonflies and bees, but with (~100) ommatidia spaced further apart, and without a lens A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), .... References Cambrian trilobites Olenelloidea Fossil taxa described in 1906 {{Redlichiida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mummaspis
''Mummaspis'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites, with five known species. It lived during the early part of the Botomian stage, which lasted from approximately 524 to 518.5 million years ago. This faunal stage was part of the Cambrian Period. Taxonomy ''Mummaspis'' is the genus closest to the common ancestor of ''Laudonia'', the Biceratopsinae and the Bristoliinae. Including the species of ''Fritzolenellus'', this clade is the sister group of ''Wanneria walcottana'' and the Holmiidae. Distribution * ''M. occidens'' was collected in the Lower Cambrian ( lower ''Olenellus''-zone) of Alberta, Canada (Mural Formation, in the talus slope immediately west of Mumm Peak, and from the middle Mural Formation, 125 m above the base of that formation, just north of the Mount Robson Provincial Park Mount Robson Provincial Park is a provincial park in the Canadian Rockies with an area of 2,249 km². The park is located ent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elliptocephala
''Elliptocephala'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from the later part of the Tommotian ( upper ''Schmidtiellus mickwitzi''-zone) to the upper Botomian ( early middle ''Olenellus''-zone). ''Elliptocephala'' can easily be confused with ''Ellipsocephalus'', a trilobite genus of the Ptychopariida order. Etymology The species ''E. walcotti'' was named in honor of Charles Doolittle Walcott, a renowned early paleontologist, that described many trilobite species. Taxonomy Relations within ''Elliptocephala'' According to Lieberman ''E. sequomalus'' is an early species, close to the common ancestor of the genus. The rest of the species fall into two distinct groups. The first consists of the closely related ''E. bicensis'' and ''E. asaphoides'', with ''E. walcotti'' and twin species ''E. praenuntius'' slightly less close and ''E. mediocris'' near the basis of this group. The second group consisting of the closely re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fallotaspis
''Fallotaspis'' is a genus of redlichiid trilobites found in Early Cambrian-aged strata of the United States and Morocco. Etymology The generic name, Fallotaspis, is a compound crassis word that honors Paul Fallot (1889-1960), a French paleontologist who researched Cambrian fossils in Spain, in combination with the Greek word ἀσπίς, ''aspis'', meaning shield. Description As with most early trilobites, ''Fallotaspis'' has an almost flat exoskeleton, that is only thinly calcified, and has crescent-shaped eye ridges. As part of the Olenellina suborder, ''Fallotaspis'' lacks dorsal sutures. As part of the superfamily Fallotaspidoidea ''Fallotaspis'' can be distinguished from Olenelloidea, Judomioidea and Nevadioidea by features of the cephalon and in particular the glabella. The glabella tapers forward. The frontal lobe of the glabella (because it is counted from the back, it is numbered L4) is as long as the most backward lobe (L0), less than in these other Olenelli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodor Kjerulf
Theodor Kjerulf (30 March 182525 October 1888) was a Norwegian geologist and professor at the University of Oslo. He also served as director of the Norwegian Geological Survey. Biography He was born in Christiania (now Oslo), Norway. He was the son of Peder Kjerulf (1781–1841) and Elisabet Maria Lasson (1791–1873). He was the brother of composer Halfdan Kjerulf. He was educated in the Royal Frederick University (now University of Oslo) and subsequently studied in Germany, working with Karl Georg Bischof in Bonn and Robert Wilhelm Bunsen in Heidelberg. In 1858, he was hired as a lecturer at the Royal Frederick University. In 1866 he was promoted to professor of geology. His contributions to the geology of Norway were numerous. From 1858 to 1888, he served as the first director of the Norwegian Geological Survey (''Norges geologiske undersøkelse''), which he had been instrumental in establishing. He also contributed to the systematic and detailed mapping of Norway's bedr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthropod
Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a Segmentation (biology), segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and Arthropod cuticle, cuticle made of chitin, often Mineralization (biology), mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages. Arthropods are bilaterally symmetrical and their body possesses an exoskeleton, external skeleton. In order to keep growing, they must go through stages of moulting, a process by which they shed their exoskeleton to reveal a new one. Some species have wings. They are an extremely diverse group, with up to 10 million species. The haemocoel, an arthropod's internal cavity, through which its haemolymph – analogue of blood – circulates, accommodates its interior Organ (anatomy), organs; it has an open circulatory system. Like their exteriors, the internal or ... [...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] |
Type (biology)
In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached. In other words, a type is an example that serves to anchor or centralizes the defining features of that particular taxon. In older usage (pre-1900 in botany), a type was a taxon rather than a specimen. A taxon is a scientifically named grouping of organisms with other like organisms, a set that includes some organisms and excludes others, based on a detailed published description (for example a species description) and on the provision of type material, which is usually available to scientists for examination in a major museum research collection, or similar institution. Type specimen According to a precise set of rules laid down in the International Code of Zoological Nomenclature (ICZN) and the International Code of Nomenclature for algae, fungi, and plants (ICN), the scientific name of every taxon is almost al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Trilobite")
.jpg "Click for more on -> Type (biology)")