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Entomostracites
''Entomostracites'' is a scientific name for several trilobites, now assigned to various other genera. * ''E. bucephalus'' = '' Paradoxides paradoxissimus'' * ''E. crassicauda'' = ''Illaenus crassicauda'' * ''E. expansus'' = ''Asaphus expansus ''Asaphus expansus'' () is the type species of the asaphid 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 fir ...'' * ''E. gibbosus'' = '' Olenus gibbosus'' * ''E. granulatus'' = '' Nankinolithus granulatus'' * ''E. laciniatus'' = '' Lichas laciniatus'' * ''E. laticauda'' = '' Eobronteus laticauda'' * ''E. paradoxissimus'' = '' Paradoxides paradoxissimus'' * ''E. pisiformis'' = '' Agnostus pisiformis'' * ''E. punctatus'' = '' Encrinurus punctatus'' * ''E. scarabaeoides'' = '' Peltura scarabaeoides'' * ''E. spinulosus'' = '' Parabolina spinulosa'' References {{Set index article, animals Disused trilo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asaphus
''Asaphus'' () is a genus of trilobites that is known from the Lower (upper Arenig) and Middle Ordovician of northwestern Europe (Sweden, Estonia, Saint Petersburg Area). Etymology The generic name is derived from the Greek word ''asaphes'', meaning "indistinct." Description The headshield (or cephalon) and tailshield (or pygidium) are semicircular and without a border (defined by a furrow or a change in convexity parallel to its margin). The cephalon is of approximately equal size as the pygidium (or isopygous). The central raised area of the cephalon (or glabella) is long, reaching the frontal margin. It may have faint lateral glabellar furrows or be smooth, and sometimes an inconspicuous tubercle is present just in front of the hardly discernible occipital ring. The natural fracture lines (sutures) of the head run along the top edges of the compound eye. From the back of the eye these cut to the back of the head (or is said to be opisthoparian) and not to the side. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paradoxides
''Paradoxides'' is a genus of large to very large trilobite found throughout the world during the Middle Cambrian period. One record-breaking specimen of ''Paradoxides davidis'', described by John William Salter in 1863, is . The cephalon was semicircular with free cheeks ending in long, narrow, recurved spines. Eyes were crescent shaped providing an almost 360° view, but only in the horizontal plane. Its elongate thorax was composed of 19-21 segments and adorned with longish, recurved pleural spines. Its pygidium was comparatively small. ''Paradoxides'' is a characteristic Middle-Cambrian trilobite of the 'Atlantic' (Avalonian) fauna. Avalonian rocks were deposited near a small continent called Avalonia in the Paleozoic Iapetus Ocean. Avalonian beds are now in a narrow strip along the East Coast of North America, and in Europe. Description The exoskeleton of ''Paradoxides'' is large to very large, relatively flat, and about one and a half times longer than wide, with greates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olenus (trilobite)
''Olenus'' is a genus of Upper Cambrian ptychopariid trilobite. Distribution ''Olenus'' can be found in the British Isles, India, Norway, Sweden, Denmark, Newfoundland, Texas, South Korea, and Australia. * ''O. haimantensis'' occurs in the Middle Cambrian of India (upper part of the Parahio Formation, left bank of the Parahio/Barachu river, above the Moopa camping ground, Spiti). Ecology Fossils of ''Olenus'' are commonly found in dark mudstones, which were deposited on the seafloor in environments with low oxygen levels. The very wide side lobes (or pleurae) are thought to have shielded extended gills, which would have helped the animal absorb the maximum amount of oxygen possible in such an environment. Evidence also suggests that ''Olenus'' and its relatives may have developed a symbiotic relationship with sulfate-reducing bacteria, either by feeding on them or by absorbing nutrients directly from them. Taxonomy Species previously assigned to ''Olenus'' * ''O. f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agnostus
''Agnostus'' is a genus of agnostid trilobites, belonging to the family Agnostidae, that lived during the late Middle Cambrian – early Upper Cambrian (about 506 to 492 million years ago). It is the type genus of the family Agnostidae and is subdivided into two subgenera, ''Agnostus'' and ''Homagnostus''. Etymology ''Agnostus'' is from the Ancient Greek άγνωστος (''ágnostos'') "unknown", and reflects the fact that early paleontologists did not know what type of animal with which they were confronted. The species epithet has this origin: * ''pisiformis'' derives from the Latin ''pīsum'' which means "pea", and ''forma'' meaning "shape", for its globe-like appearance when rolled. Description ] Like all Agnostida, ''Agnostus'' is diminutive and the headshield (or Cephalon (arthropod head)#Trilobites, cephalon) and tailshield (or pygidium) are around the same size (or isopygous) and outline. As in all Agnostina, ''Agnostus'' has two thorax segments. When Agnostina are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peltura
''Peltura'' is a genus of trilobites from the Upper Cambrian. The type specimen of ''Peltura scarabaeoides'', the type species of the genus, was discovered in the Alum Shale Formation of Sweden and described by the Swedish naturalist Göran Wahlenberg Georg (Göran) Wahlenberg (1 October 1780 – 22 March 1851) was a Swedish naturalist. He was born in Kroppa, Värmland County. Wahlenberg matriculated at Uppsala University in 1792, received his doctorate in Medicine in 1806, was appoint ... in 1818. Species of this genus have now been found throughout the Scandinavian and Baltic regions. References Olenina Ptychopariida genera Fossil taxa described in 1818 Taxa named by Henri Milne-Edwards {{Ptychopariida-stub ... [...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. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genera
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treatise On Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and extant (still living) invertebrate animals. The prehistoric invertebrates are described as to their taxonomy, morphology, paleoecology, stratigraphic and paleogeographic range. However, taxa with no fossil record whatsoever have just a very brief listing. Publication of the decades-long ''Treatise on Invertebrate Paleontology'' is a work-in-progress; and therefore it is not yet complete: For example, there is no volume yet published regarding the post-Paleozoic era caenogastropods (a molluscan group including the whelk and periwinkle). Furthermore, every so often, previously published volumes of the ''Treatise'' are revised. Evolution of the project Raymond C. Moor ... [...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 tauricornis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichas (trilobite)
''Lichas'' is a genus of lichid trilobites from Ordovician-Devonian-aged marine strata of Europe and Morocco Morocco (),, ) officially the Kingdom of Morocco, is the westernmost country in the Maghreb region of North Africa. It overlooks the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria ....F. R. C. Reed. 1907. A new species of ''Lichas''. ''Geological Magazine'' 54:396-400 References Lichida Ordovician trilobites of Europe Ordovician trilobites of Africa Paleozoic life of Quebec {{lichida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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