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Mammal
Mammals are the vertebrates within the class Mammalia (/məˈmeɪliə/ from Latin mamma "breast"), a clade of endothermic amniotes distinguished from reptiles (including birds) by the possession of a neocortex (a region of the brain), hair, three middle ear bones, and mammary glands. Females of all mammal species nurse their young with milk, secreted from the mammary glands. Mammals include the largest animal on the planet, the blue whale. The basic body type is a terrestrial quadruped, but some mammals are adapted for life at sea, in the air, in trees, underground or on two legs. The largest group of mammals, the placentals, have a placenta, which enables the feeding of the fetus during gestation. Mammals range in size from the 30–40 mm (1.2–1.6 in) bumblebee bat to the 30-meter (98 ft) blue whale. With the exception of the five species of monotreme (egg-laying mammals), all modern mammals give birth to live young
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Ordovician
The Ordovician
Ordovician
( /ɔːrdəˈvɪʃən/) is a geologic period and system, the second of six periods of the Paleozoic
Paleozoic
Era
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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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Carboniferous
The Carboniferous
Carboniferous
is a geologic period and system that spans 60 million years from the end of the Devonian
Devonian
Period 358.9 million years ago (Mya), to the beginning of the Permian
Permian
Period, 298.9 Mya
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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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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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Precambrian
The Precambrian
Precambrian
(or Pre-Cambrian, sometimes abbreviated pЄ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic
Phanerozoic
Eon. The Precambrian
Precambrian
is so named because it preceded the Cambrian, the first period of the Phanerozoic
Phanerozoic
eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian
Precambrian
accounts for 88% of the Earth's geologic time. The Precambrian
Precambrian
(colored green in the timeline figure) is a supereon that is subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale
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Cambrian
The Cambrian
Cambrian
Period ( /ˈkæmbriən/ or /ˈkeɪmbriən/) was the first geological period of the Paleozoic
Paleozoic
Era, of the Phanerozoic
Phanerozoic
Eon.[6] The Cambrian
Cambrian
lasted 55.6 million years from the end of the preceding Ediacaran
Ediacaran
Period 541 million years ago (mya) to the beginning of the Ordovician
Ordovician
Period 485.4 mya.[7] Its subdivisions, and its base, are somewhat in flux
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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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Devonian
The Devonian
Devonian
is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya.[9] It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. Various terrestrial arthropods also became well-established. Fish
Fish
reached substantial diversity during this time, leading the Devonian
Devonian
to often be dubbed the "Age of Fish"
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Permian
The Permian
Permian
is a geologic period and system which spans 46.7 million years from the end of the Carboniferous
Carboniferous
Period 298.9 million years ago (Mya), to the beginning of the Triassic
Triassic
period 251.902 Mya. It is the last period of the Paleozoic
Paleozoic
era; the following Triassic
Triassic
period belongs to the Mesozoic
Mesozoic
era. The concept of the Permian
Permian
was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the city of Perm. The Permian
Permian
witnessed the diversification of the early amniotes into the ancestral groups of the mammals, turtles, lepidosaurs, and archosaurs. The world at the time was dominated by two continents known as Pangaea
Pangaea
and Siberia, surrounded by a global ocean called Panthalassa
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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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Class (biology)
In biological classification, class (Latin: classis) is:a taxonomic rank. Other well-known ranks in descending order of size are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the prefix sub-: subclass (Latin: subclassis). a taxonomic unit, a taxon, in that rank. In that case the plural is classes (Latin classes)Example: Dogs are in the class Mammalia.The composition of each class is determined by a taxonomist. Often there is no exact agreement, with different taxonomists taking different positions. There are no hard rules that a taxonomist needs to follow in describing a class, but for well-known animals there is likely to be consensus. In botany, classes are now rarely discussed
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Triassic
The Triassic
Triassic
( /traɪˈæsɪk/) is a geologic period and system which spans 50.9 million years from the end of the Permian
Permian
Period 251.9 million years ago (Mya), to the beginning of the Jurassic
Jurassic
Period 201.3 Mya.[8] The Triassic
Triassic
is the first period of the Mesozoic
Mesozoic
Era. Both the start and end of the period are marked by major extinction events.[9] The Triassic
Triassic
began in the wake of the Permian– Triassic
Triassic
extinction event, which left the earth's biosphere impoverished; it would take well into the middle of this period for life to recover its former diversity. Therapsids and archosaurs were the chief terrestrial vertebrates during this time
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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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Trechnotheria
Theriiformes Rowe, 1988Trechnotheria is a group of mammals that includes the therians and some fossil mammals from the Mesozoic Era. In the Jurassic through Cretaceous periods, the group was endemic to what would be Asia and Africa.[1] Trechnotheria has been assigned various ranks, but was originally called a "superlegion" by the original author.[2] One reference has defined the Trechnotheria as the clade comprising the last common ancestor of Zhangheotherium and living therian mammals, and all its descendants.[3]Contents1 Characteristics 2 Phylogeny 3 Sources 4 See alsoCharacteristics[edit] Like most Mesozoic mammal groups, early trechnotherians are known mainly from their teeth. Hence, one of the most prominent features of this group is the "hypertrophied postvallum/prevallid shearing mechanism", along with other dental characters
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