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Arthropod
Condylipoda Latreille, 1802 An ARTHROPOD (from Greek ἄρθρον arthron, "joint" and πούς pous, "foot") is an invertebrate animal having an exoskeleton (external skeleton ), a segmented body, and paired jointed appendages . Arthropods form the phylum EUARTHROPODA, which includes insects , arachnids , myriapods , and crustaceans . The term ARTHROPODA as originally proposed refers to a proposed grouping of Euarthropods and the phylum Onychophora . Arthropods are characterized by their jointed limbs and cuticle made of chitin , often mineralised with calcium carbonate . The arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting . Their versatility has enabled them to become the most species-rich members of all ecological guilds in most environments
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Megaannum
A YEAR is the orbital period of the Earth
Earth
moving in its orbit around the Sun
Sun
. Due to the Earth's axial tilt , the course of a year sees the passing of the seasons , marked by changes in weather , the hours of daylight , and, consequently, vegetation and soil fertility . In temperate and subpolar regions around the planet, four seasons are generally recognized: spring , summer , autumn and winter . In tropical and subtropical regions several geographical sectors do not present defined seasons; but in the seasonal tropics , the annual wet and dry seasons are recognized and tracked. The current year is 2018. A calendar year is an approximation of the number of days of the Earth's orbital period as counted in a given calendar . The Gregorian, or modern, calendar , presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars ; see below
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Jurassic
The JURASSIC ( /dʒʊˈræsɪk/ ; from Jura Mountains
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. The Jurassic
Jurassic
constituted the middle period of the Mesozoic Era , also known as the Age of Reptiles. The start of the period was marked by the major Triassic–Jurassic extinction event . Two other extinction events occurred during the period: the Pliensbachian/ Toarcian event in the Early Jurassic, and the Tithonian event at the end; however, neither event ranks among the "Big Five" mass extinctions
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Paleogene
The PALEOGENE ( /ˈpæliːədʒiːn/ or /ˈpeɪliːədʒiːn/ ; also spelled PALAEOGENE or PALæOGENE; informally LOWER 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. It is the beginning of the Cenozoic Era of the present Phanerozoic
Phanerozoic
Eon. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event
Cretaceous–Paleogene extinction event
that ended the preceding Cretaceous
Cretaceous
Period
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Neogene
The NEOGENE ( /ˈniːəˌdʒiːn/ ) (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 Period 2.58 Mya. The Neogene
Neogene
is sub-divided into two epochs , the earlier Miocene
Miocene
and the later Pliocene
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
Africa
near the end of the period
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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 . The Swedish botanist Carl Linnaeus
Carl Linnaeus
is regarded as the father of taxonomy, as he developed a system known as Linnaean taxonomy for categorization of organisms and binomial nomenclature for naming organisms
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Triassic
The TRIASSIC ( /traɪˈæsɪk/ ) is a geologic period and system which spans 50.9 million years from the end of the Permian
Permian
Period 251.902 million years ago (Mya ), to the beginning of the Jurassic Period 201.3 Mya . The Triassic
Triassic
is the first period of the Mesozoic Era . Both the start and end of the period are marked by major extinction events . 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. A specialized subgroup of archosaurs, called dinosaurs , first appeared in the Late Triassic but did not become dominant until the succeeding Jurassic
Jurassic
Period
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Cretaceous
The 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 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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Precambrian
The 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
Cambrian
, the first period of the Phanerozoic
Phanerozoic
eon, which is named after Cambria , the Latinised name for Wales
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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Permian
The 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 era; the following Triassic
Triassic
period belongs to the 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
Perm
. The Permian
Permian
witnessed the diversification of the early amniotes into the ancestral groups of the mammals , turtles , lepidosaurs , and archosaurs
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Silurian
The 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. 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 major 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. Multi-cellular life also began to appear on land in the form of small, bryophyte -like and vascular plants that grew beside lakes, streams, and coastlines, and terrestrial arthropods are also first found on land during the Silurian
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Ordovician
The ORDOVICIAN ( /ɔːrdəˈvɪʃən/ ) is a geologic period and system , the second of six periods of the Paleozoic Era . The Ordovician
Ordovician
spans 41.2 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya. The Ordovician, named after the Celtic tribe of the Ordovices , was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick
Adam Sedgwick
and Roderick Murchison , who were placing the same rock beds in northern Wales into the Cambrian
Cambrian
and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian
Silurian
systems, and placed them in a system of their own
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Devonian
The DEVONIAN is a geologic period and system of the Paleozoic , spanning 60 million years from the end of the Silurian
Silurian
, 419.2 million years ago (Mya), to the beginning of the Carboniferous , 358.9 Mya. It is named after Devon
Devon
, England
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
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Carboniferous
The 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 Period, 298.9 Mya. The name Carboniferous
Carboniferous
means "coal-bearing" and derives from the Latin words carbō ("coal ") and ferō ("I bear, I carry"), and was coined by geologists William Conybeare and William Phillips in 1822. Based on a study of the British rock succession, it was the first of the modern 'system' names to be employed, and reflects the fact that many coal beds were formed globally during that time. The Carboniferous
Carboniferous
is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian . Terrestrial life was well established by the Carboniferous
Carboniferous
period
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Cambrian
The CAMBRIAN Period ( /ˈkæmbriən/ or /ˈkeɪmbriən/ ) was the first geological period of the Paleozoic Era, of the Phanerozoic
Phanerozoic
Eon. 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. 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 Latinised form of Cymru, the Welsh name for Wales
Wales
, where Britain's Cambrian
Cambrian
rocks are best exposed
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Fish Louse
See text The family ARGULIDAE contains the CARP LICE or FISH LICE – a group of parasitic crustaceans of uncertain position within the Maxillopoda . Although they are thought to be primitive forms, they have no fossil record . The Argulidae are the only family in the order ARGULOIDA (occasionally "Arguloidea"), ARGULUS O. F. Müller, 1785: * Argulus africanus Thiele, 1900 * Argulus alexandrensis C. B. Wilson, 1923 * Argulus alosae Gould, 1841 * Argulus amazonicus Malta & Santos-Silva, 1986 * Argulus ambloplites C. B. Wilson, 1920 * Argulus ambystoma Poly, 2003 * Argulus americanus C. B. Wilson, 1902 * Argulus angusticeps Cunnington, 1913 * Argulus annae Schuurmans Stekhoven J.H. Jr, 1951 * Argulus appendiculosus C. B
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