Illaenina

	Illaenina The Illaenina are a suborder of trilobites in the order Corynexochida. Taxonomy '' Illaenidae'' Alloillaenus, Bumastoides, Dysplanus, Ectillaenus, Harpillaenus, Hyboaspis, Illaenus, Nanillaenus, Ninglangia, Octillaenus, Ordosaspis, Parillaenus, Platillaenus, Ptilillaenus, Quadratillaenus, Snajdria, Spinillaenus, Stenopareia, Trigoncekovia, Ulugtella, Vysocania, Wuchuanella, Zbirovia, Zdicella, Zetillaenus. '' Panderiidae'' Hemibarrandia, Ottenbyaspis, Panderia, Pogrebovites. ''Styginidae'' Alceste, Altaepeltis, Amphoriops, Ancyropyge, Andegavia, Arctipeltis, Australoscutellum, Avascutellum, Bojoscutellum, Boreoscutellum, Breviscutellum, Bronteopsis, Brontocephalina, Brontocephalus, Bubupeltina, Bumastella, Bumastus, Calycoscutellum, Cavetia, Cekovia, Chichikaspis, Chugaevia, Ciliscutellum, Cornuscutellum, Craigheadia, Cybantyx, Decoroscutellum, Delgadoa, Dentaloscutellum, Dulanaspis, Ekwanoscutellum, Eobronteus, Eokoso ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Trilobite Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most successful of all early animals, existing in oceans for almost 270million years, with over 22,000 species having been described. Because trilobites had wide diversity and an easily fossilized mineralised exoskeleton made of calcite, they left an extensive fossil record. The study of their fossils has facilitated important contributions to biostratigraphy, paleontology, evolution, evolutionary biology, and plate tectonics. Trilobites are placed within the clade Artiopoda, which includes many organisms that are morphologically similar to trilobites, but are largely unmineralised. The relationship of Artiopoda to other arthropods is uncertain. Trilobites evolved into many ecological niches; some moved over the seabed as predators, scavengers, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Corynexochida Corynexochida is an order of trilobite that lived from the Lower Cambrian to the Late Devonian. Like many of the other trilobite orders, Corynexochida contains many species with widespread characteristics. Description The middle region of the cephalon (arthropod anatomy), cephalon (the glabella) is typically elongate, with the sides often spreading forward (pestle-shaped). Some species have glabellae that are ''effaced'', meaning they are smooth and show little detail. The glabellar furrows (when not effaced) typically have a splayed arrangement. In most species, the hind pair on either side of the cephalon become spines that point sharply backwards, and the spinose tips of the anterior pairs of thoracic segments tend to become more and more forward directed toward the pygidium. The eyes are typically large. Pygidia are typically large, competing in size with the cephalon in some species. The tips of the thoracic segments of many Corynexochida species are spine-like (though in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Illaenidae The Illaenidae are a family of trilobites in the order Corynexochida. 223 currently accepted species in 24 genera are known from the Ordovician. Some scholars include the Panderiidae in the Illaenidae, but this is not generally supported. Distribution ''Illaenus? priscus'' from Salair and ''Illaenus? berkutensis'' from the Malyi Karatau, Kazakhstan (both Lower Tremadocian), are both very poorly known and it remains uncertain to which family they could best be assigned. The first certain Illaenid is ''I. hinomotoensis'' from the Upper Tremadocian of North China and South Korea. The earliest species known from Laurentia (western Ireland) is ''I. weaveri'', probably latest Floian. These early occurrences are from the tropics, but during the Darriwilian the family spread over southern Gondwana, and became cosmopolitan for the remainder of the Ordovician, although most genera had limited distributions. The genus ''Stenopareia'' survived the Ordovician–Silurian extinction events a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Panderiidae ''Panderiidae'' is a family of trilobites in the order Corynexochida. These nektobenthic carnivores lived in the Ordovician period, from 488.3 to 443.7 Ma. Genera '' Hemibarrandia'' '' Panderia'' Distribution Fossils of this family have been found in the Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ... sediments of Czech Republic, France, Norway, Spain, Sweden and United Kingdom. References Ordovician trilobites Illaenina Trilobite families {{Corynexochida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Styginidae Styginidae is a family of trilobite in the order Corynexochida. Fossils of the various genera are found in marine strata throughout the world, aged from Ordovician up until the family's extinction during the Silurian. Genera Styginidae contains the following genera. * ''Alceste (trilobite), Alceste'' * ''Ancyropyge'' Clark 1891 * ''Arctipeltis'' Maksimova 1986 * ''Australoscutellum'' Chatterton and Campbell 1980 * ''Bojoscutellum'' Snajdr 1958 * ''Breviscutellum'' Snajdr 1960 * ''Bronteopsis'' Nicholson and Etheridge 1879 * ''Bumastus'' Murchison 1839 * ''Cekovia'' Snajdr 1956 * ''Cornuscutellum'' Snajdr 1960 * ''Cybantyx'' Lane and Thomas 1978 * ''Decoroscutellum'' Snajdr 1958 * ''Delgadoa'' Thadeau 1947 * ''Dentaloscutellum'' Chatterton 1971 * ''Ekwanoscutellum'' Pribyl and Vanek 1972 * ''Eobronteus'' Reed 1928 * ''Eokosovopeltis'' Pribyl and Vanek 1972 * ''Failleana'' Chatterton and Ludvigson 1976 * ''Goldillaenoides'' Balashova 1959 * ''Goldillaenus'' Schindewolf 1924 * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Illaenus ''Illaenus'' is a genus of trilobites from Russia and Morocco, from the middle Ordovician. Species included in this genus can reach a length of about . They are without glabella and without articulation of the tail. The cephalon has a high profile and recurved genal spines. Eyes are distant from the axis of the head, situated nearer to the edge. Selected species This genus includes about 50 species: '' Illaenus alveatus'' Raymond 1925 '' Illaenus auriculatus'' Ross Jr. & Barnes 1967 '' Illaenus bayfieldi'' Billings 1859 '' Illaenus bucculentus'' Whittington 1963 '' Illaenus consimilis'' Billings 1865 '' Illaenus consobrinus'' Billings 1865 '' Illaenus crassicauda'' Wahlenberg 1826 '' Illaenus fraternus'' Billings 1865 '' Illaenus gelasinus'' Whittington 1965 '' Illaenus lacertus'' Whittington 1954 '' Illaenus marginalis'' Raymond 1925 '' Illaenus oscitatus'' Fortey 1980 '' Illaenus slancyensis'' Krylov 2016 '' Illaenus spiculatus'' Whittington 1963 ''Illaenus taur ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Ectillaenus ''Ectillaenus'' is a genus of trilobites in the order Corynexochida. These nektobenthic carnivores lived in the Ordovician period, from 478.6 to 449.5 Ma. Taxonomy Species include: ''Ectillaenus advena'' (Barrande, 1872) ''Ectillaenus benignensis'' (Novák in Perner, 1918) ''Ectillaenus giganteus'' (Burmeister, 1843) ''Ectillaenus holubi '' (Šnajdr, 1956) ''Ectillaenus katzeri'' (Barrande, 1872) ''Ectillaenus sarkaensis'' (Novák in Perner, 1918) Distribution Fossils of this genus have been found in the Ordovician sediments of Czech Republic, France, Morocco, Portugal, Spain and United Kingdom, as well as in the Arenig In geology, the Arenig (or Arenigian) is a time interval during the Ordovician period and also the suite of rocks which were deposited during this interval. History The term was first used by Adam Sedgwick in 1847 with reference to the "Areni ... of the United Kingdom. References Corynexochida genera Illaenina Ordovician trilobites Extinct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Cambrian The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma. Most of the continents lay in the southern hemisphere surrounded by the vast Panthalassa Ocean. The assembly of Gondwana during the Ediacaran and early Cambrian led to the development of new convergent plate boundaries and continental-margin arc magmatism along its margins that helped drive up global temperatures. Laurentia lay across the equator, separated from Gondwana by the opening Iapetus Ocean. The Cambrian marked a profound change in life on Earth; prior to the Period, the majority of living organisms were small, unicellular and poorly preserved. Complex, multicellular organisms gradually became more common during the Ediacaran, but it was not until the Cambrian that fossil diversity seems to rapidly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]