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Synapsid
Theropsida
Theropsida
Seeley, 1895[1]Synapsids (Greek, 'fused arch'), synonymous with theropsids (Greek, 'beast-face'), are a group of animals that includes mammals and every animal more closely related to mammals than to other living amniotes.[2] They are easily separated from other amniotes by having a temporal fenestra, an opening low in the skull roof behind each eye, leaving a bony arch beneath each; this accounts for their name.[3] Primitive synapsids are usually called pelycosaurs or pelycosaur-grade synapsids; more advanced mammal-like ones, therapsids. The non-mammalian members are described as mammal-like reptiles in classical systematics;[4][5] they can also be called stem mammals or proto-mammals.[6] Synapsids evolved from basal amniotes and are one of the two major groups of the later amniotes; the other is the sauropsids, a group that includes modern reptiles and birds
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Synapse
In the nervous system, a synapse[1] is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron or to the target efferent cell. Santiago Ramón y Cajal
Santiago Ramón y Cajal
proposed that neurons are not continuous throughout the body, yet still communicate with each other, an idea known as the neuron doctrine.[2] The word "synapse" – from the Greek synapsis (συνάψις), meaning "conjunction", in turn from συνάπτεὶν (συν ("together") and ἅπτειν ("to fasten")) – was introduced in 1897 by the Engli
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Cretaceous
The Cretaceous
Cretaceous
( /krɪˈteɪʃəs/, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic
Jurassic
Period 145 million years ago (mya) to the beginning of the Paleogene Period 66 mya. It is the last period of the Mesozoic
Mesozoic
Era. The Cretaceous
Cretaceous
Period is usually abbreviated K, for its German translation Kreide (chalk). The Cretaceous
Cretaceous
was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds, as well as flowering plants, appeared
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Myr
The abbreviation myr, "million years", is a unit of a quantity of 7006100000000000000♠1,000,000 (i.e. 7006100000000000000♠1×106) years, or 31.6 teraseconds.Contents1 Usage 2 Debate 3 See also 4 ReferencesUsage[edit] Myr
Myr
is in common use where the term is often written, such as in Earth science and cosmology. Myr
Myr
is seen with mya, "million years ago". Together they make a reference system, one to a quantity, the other to a particular place in a year numbering system that is time before the present. Myr
Myr
is deprecated in geology, but in astronomy myr is standard
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Greek Language
Greek (Modern Greek: ελληνικά [eliniˈka], elliniká, "Greek", ελληνική γλώσσα [eliniˈci ˈɣlosa] ( listen), ellinikí glóssa, "Greek language") is an independent branch of the Indo-European family of languages, native to Greece
Greece
and other parts of the Eastern Mediterranean
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Harry Seeley
Harry Govier Seeley (18 February 1839 – 8 January 1909) was a British paleontologist.[1][2]Contents1 Career 2 Dinosaurs 3 References 4 External linksCareer[edit] Seeley was born in London, the son of Richard Hovill Seeley, goldsmith, and his second wife Mary Govier. He attended classes at the Royal School of Mines, Kensington before becoming an assistant to Adam Sedgwick at the Woodwardian Museum, Cambridge, from 1859. He matriculated as a student at Sidney Sussex College, Cambridge
Sidney Sussex College, Cambridge
in 1863.[3] He turned down positions both with the British Museum
British Museum
and the Geological Survey of Britain to work on his own. Late in his career he accepted a position as Professor of Geology at King's College, Cambridge and Bedford College (London)
Bedford College (London)
(1876)
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Synonym (taxonomy)
In scientific nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name,[1] although the term is used somewhat differently in the zoological code of nomenclature.[2] For example, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called Pinus abies. This name is no longer in use: it is now a synonym of the current scientific name which is Picea abies. Unlike synonyms in other contexts, in taxonomy a synonym is not interchangeable with the name of which it is a synonym. In taxonomy, synonyms are not equals, but have a different status. For any taxon with a particular circumscription, position, and rank, only one scientific name is considered to be the correct one at any given time (this correct name is to be determined by applying the relevant code of nomenclature)
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Henry Fairfield Osborn
Henry Fairfield Osborn, Sr. ForMemRS[1] (August 8, 1857 – November 6, 1935) was an American geologist, paleontologist, and eugenist, and the president of the American Museum of Natural History
American Museum of Natural History
for 25 years. Contents1 Early life and career 2 Eponyms 3 Theories3.1 Dawn Man Theory 3.2 Evolutionary views4 Published books 5 References5.1 Works cited6 Further reading 7 External linksEarly life and career[edit]Osborn in 1890Son of the prominent railroad tycoon William Henry Osborn and his wife, Virginia Reed Osborn, Henry Fairfield Osborn
Henry Fairfield Osborn
was born in Fairfield, Connecticut, 1857. He studied at Princeton University (1873–1877), obtaining a B.A. in geology and archaeology, where he was mentored by paleontologist Edward Drinker Cope
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Animal
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs. The study of animals is called zoology. Aristotle divided animals into those with blood and those without. Carl Linnaeus
Carl Linnaeus
created the first hierarchical biological classification for animals in 1758 with his Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla by 1809
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Taxonomy (biology)
Taxonomy (from Ancient Greek τάξις (taxis), meaning 'arrangement', and -νομία (-nomia), meaning 'method') is the science of defining and naming groups of biological organisms on the basis of shared characteristics. Organisms are grouped together into taxa (singular: taxon) and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a super-group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum (division is sometimes used in botany in place of phylum), class, order, family, genus and species
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National Museum Of Natural History
The National Museum
Museum
of Natural History
Natural History
is a natural-history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C., United States. It has free admission and is open 364 days a year
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Neogene
The Neogene
Neogene
( /ˈniːəˌdʒiːn/)[6][7] (informally Upper Tertiary or Late Tertiary) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period 23.03 million years ago (Mya) to the beginning of the present Quaternary
Quaternary
Period 2.58 Mya. The Neogene
Neogene
is sub-divided into two epochs, the earlier Miocene
Miocene
and the later Pliocene. Some geologists assert that the Neogene
Neogene
cannot be clearly delineated from the modern geological period, the Quaternary. During this period, mammals and birds continued to evolve into roughly modern forms, while other groups of life remained relatively unchanged. Early hominids, the ancestors of humans, appeared in Africa near the end of the period
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Paleogene
The Paleogene (/ˈpæliədʒiːn, ˈpeɪliə-/; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous
Cretaceous
Period 66 million years ago (Mya) to the beginning of the Neogene
Neogene
Period 23.03 Mya
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Pareiasaur
Pareiasaurs (meaning "cheek lizards") are an extinct group of anapsid reptiles classified in the family Pareiasauridae. They were large herbivores that flourished during the Permian
Permian
period.Contents1 Description 2 Evolutionary history 3 Classification3.1 Associated clades 3.2 Phylogeny4 References 5 External linksDescription[edit]Restoration of BradysaurusPareiasaurs ranged in size from 60 to 300 centimetres (2.0 to 9.8 ft) long, and may have weighed up to 600 kilograms (1,300 lb). They were stocky, with short tails, small heads, robust limbs, and broad feet. The cow-sized species Bunostegos, which lived 260 million years ago, is the earliest known example of a tetrapod with a fully erect posture as its legs were positioned directly under their bodies.[1] Pareiasaurs were protected by bony scutes called osteoderms that were set into the skin. Their heavy skulls were ornamented with multiple knobs and ridges
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Jurassic
The Jurassic
Jurassic
( /dʒʊˈræsɪk/; from Jura Mountains) was a geologic period and system that spanned 56 million years from the end of the Triassic
Triassic
Period 201.3 million years ago (Mya) to the beginning of the Cretaceous
Cretaceous
Period 145 Mya.[note 1] The Jurassic
Jurassic
constituted the middle period of the Mesozoic
Mesozoic
Era, also known as the Age of Reptiles. The start of the period was marked by the major Triassic–Jurassic extinction event
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Silurian
The Silurian
Silurian
is a geologic period and system spanning 24.6 million years from the end of the Ordovician
Ordovician
Period, at 443.8 million years ago (Mya), to the beginning of the Devonian
Devonian
Period, 419.2 Mya.[8] As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by several million years. The base of the Silurian
Silurian
is set at a series of major Ordovician–Silurian extinction events
Ordovician–Silurian extinction events
when 60% of marine species were wiped out. A significant evolutionary milestone during the Silurian
Silurian
was the diversification of jawed and bony fish
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