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Mesolenellus
''Mesolenellus'' is an extinct genus of trilobites that lived during the lower Cambrian (Botomian), found in Greenland and Spitsbergen. Etymology ''Mesolenellus'' is a contraction of meso - middle - and ''Olenellus'', the genus from which it was split off. The epithet ''hyperborea'' is a contraction of hyper (Greek ὑπέρ "excess") and Boreas ( el, Βορέας), god of the North Wind in Greek mythology, referencing the current geographical position of the deposits of its type location. ''M. svalbardensis'' has been named for the Norwegian island group Svalbard or Spitsbergen, where it was originally collected. Taxonomy It was considered a subgenus of ''Olenellus ''Olenellus'' is an extinct genus of redlichiid trilobites, with species of average size (about long). It lived during the Botomian and Toyonian stages (''Olenellus''-zone), , in what is currently North-America, part of the palaeocontinent Lau ...'' before. The nearest relatives of ''Mesolenellus'' are the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olenellus
''Olenellus'' is an extinct genus of redlichiid trilobites, with species of average size (about long). It lived during the Botomian and Toyonian stages (''Olenellus''-zone), , in what is currently North-America, part of the palaeocontinent Laurentia. Etymology ''Olenellus fowleri'' was named in honor of Ed Fowler''Olenellus'' means small ''Olenus'', after a genus belonging to the Ptychopariida, to which the type species ''O. thompsoni'' was originally assigned. The name Olenus refers to a mythological figure who was turned to stone by the gods. The names of the species have the following derivations. * ''agellus'' comes from the Latin word for field or hamlet. * ''chiefensis'' refers to the Chief Range, which includes the Ruin Wash section, that holds the last of the Olenellina. * ''fowleri'' was named in honor of Ed Fowler, whose quarrying skills exposed the type locality of this species. * ''getzi'' is called afteNoah L. Getz on whose Lancaster estate several ''Olene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limniphacos
''Limniphacos'' is a genus of trilobites, a well known group of marine arthropods. The genus so far contains one species, ''L. perspicullum''. Etymology ''Limniphacos'' is derived from the Greek words ''limne'' (lake) and ''phakos'' (lens of the eye). Distribution Earliest portion of the upper part of the Buen Formation, Brillesø, North of the Jørgen Brønlund Fjord, Southern Peary Land, Greenland. Ecology ''Limniphacos perspiculum'' occurs together with '' Mesolenellus hyperborea'', ''Serrodiscus'', hyoliths, ''Petrianna fulmenta'' (Bradoriida), and inarticulate brachiopods. Description The raised central part of the head shield (or glabella) is conical (with a narrow front and a wide back), and has four or five pairs of furrows. It does not reach the border furrow with its front. The eye lobes are short and do not reach the most backward glabellar lobe. The headshield (or cephalon) carries four spines. Those closest to the axis (or intergenal spines) are short. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesonacinae
The Mesonacinae comprise an extinct subfamily of trilobites that lived during the Botomian, found in North-America, Greenland and North-Western Scotland. The two genera in this subfamily are ''Mesonacis'' and ''Mesolenellus ''Mesolenellus'' is an extinct genus of trilobites that lived during the lower Cambrian (Botomian), found in Greenland and Spitsbergen. Etymology ''Mesolenellus'' is a contraction of meso - middle - and ''Olenellus'', the genus from which it w ...''. References External links''Photo of M. vermontanus'' Olenellidae Cambrian trilobites [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesonacis
''Mesonacis'' is an extinct genus of trilobite that lived during the Botomian, found in North-America (excluding Greenland), and the United Kingdom (North-Western Scotland). Some of the species now regarded part of ''Mesonacis'', have previously been assigned to ''Angustolenellus'' or ''Olenellus (Angustolenellus)''. ''Angustolenellus'' is now regarded a junior synonym of ''Mesonacis''. Etymology ''M. vermontanus'' is named after the State of Vermont, where it was collected. ''M. bonnensis'' is called after the Bonne Bay, Newfoundland, where the species is found. ''M. eagerensis'' refers to the Eager Formation, British Columbia, in which it occurs. ''M. hamoculus'' is derived from the Latin hamus, meaning hooked, and oculus, meaning eye. Distribution ''M. vermontanus'' occurs in the middle Upper ''Olenellus''-zone of Vermont (Parker Slate, Georgia). ''M. bonnensis'' has been found in the ''Olenellus''-zone of Newfoundland, Canada (Forteau Formation, East shore of the Bonn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiopod
Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically-oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachiopods, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bradoriida
Bradoriids are an extinct order of small marine arthropods with a bivalved carapace, and were globally distributed, forming a significant portion of the Cambrian and Early Ordovician soft-bodied communities. Affinity Whilst the Bradoriida were traditionally considered as relatives of the modern bivalved arthropod group Ostracoda, the anatomy of their appendages does not support such a relationship; neither are they related to the Cambrian bivalved arthropod group Phosphatocopida. Rather, they are most probably related to the Eucrustacea at a stem-group level. An in-depth phylogenetic analysis of Panarthropoda included two bradoriid genera, '' Kunyangella'' and ''Kunmingella'', and recovered them as the most basal stem- mandibulates. Occurrence Bradoriida are geographically widespread, and first occur in the fossil record shortly before the earliest trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyolitha
Hyoliths are animals with small conical shells, known as fossils from the Palaeozoic era. They are at least considered as lophotrochozoan, and possibly being lophophorates, a group which includes the brachiopods, while others consider them as being basal lophotrochozoans, or even molluscs. Morphology The shell of a hyolith is typically one to four centimeters in length, triangular or elliptical in cross section. Some species have rings or stripes. It comprises two parts: the main conical shell (previously referred to as a ‘conch’) and a cap-like operculum. Some also had two curved supports known as ''helens'' They are calcareous – probably aragonitic All of these structures grew by marginal accretion. Shell microstructure The orthothecid shell has an internal layer with a microstructure of transverse bundles, and an external layer comprising longitudinal bundles. Helens Some hyoliths had helens, long structures that taper as they coil gently in a logarithmic spira ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aaveqaspis
''Aaveqaspis'' is a genus of small (about long) marine arthropods of unclear affiliation, that lived during the early Cambrian period. Fossil remains of ''Aaveqaspis'' were collected from the Lower Cambrian Sirius Passet fossil-Lagerstätte of North Greenland. ''Aaveqaspis'' looks like a soft eyeless trilobite with a weakly defined axis, a headshield (or cephalon) with stubby genal spines, 5 thorax segments also ending in stubby genal spines, and a tailshield (pygidium) with a pair of massive tusk-like spines, and two smaller spines near the end of the axis. The only species presently known is ''A. inesoni'' (i.e. the genus is monotypic). Etymology The name of the genus is a compound of the Greenlandic word ' (walrus), reflecting the likeness of the tail spines to the tusks of a walrus, and the Greek word ' (shield). The species was named after Jon R. Ineson to honour him for his studies of the Cambrian of North Greenland. Description ''Aaveqaspis inesoni'' is almost flat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kleptothule
''Kleptothule rasmusseni'' is a small, elongated trilobite, about 3 cm in length, and about 5 to 6 mm in width, from the Sirius Passet Lagerstätte. It is currently placed in the family Nevadiidae, though this may change with further study. Its cephalon is composed of at least five segments, and its elongated thorax is composed of 27+ segments. The 20 or so segments of the pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is compo ... are poorly defined, as they are fused together. The original publication was in Transactions of the Royal Society of Edinburgh in 1995, External links * * Peripatus Homepage "Trilobite Origins*https://web.archive.org/web/20070831114814/http://www.palaeos.com/Paleozoic/Cambrian/Sirius_Passet.html Redlichiida Cambrian trilobites Cambria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sirius Passet
Sirius Passet is a Cambrian Lagerstätte in Peary Land, Greenland. The Sirius Passet Lagerstätte was named after the Sirius sledge patrol that operates in North Greenland. It comprises six places in Nansen Land, on the east shore of J.P. Koch Fjord in the far north of Greenland. It was discovered in 1984 by A. Higgins of the Geological Survey of Greenland. A preliminary account was published by Simon Conway Morris and others in 1987 and expeditions led by J. S. Peel and Conway Morris have returned to the site several times between 1989 and the present. A field collection of perhaps 10,000 fossil specimens has been amassed. It is a part of the Buen Formation. Age The fauna is inevitably compared to that of the Burgess Shale, although it is probably ten to fifteen million years older – vs. ) – and more closely contemporaneous with the fauna of the Maotianshan shales from Chengjiang, which are dated to . Preservation The preservation of the Sirius Passet is traditionall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peary Land
Peary Land is a peninsula in northern Greenland, extending into the Arctic Ocean. It reaches from Victoria Fjord in the west to Independence Fjord in the south and southeast, and to the Arctic Ocean in the north, with Cape Morris Jesup, the northernmost point of Greenland's mainland, and Cape Bridgman in the northeast. History Ancient settlements Peary Land was historically inhabited by three separate cultures, during which times the climate was milder than presently: *Independence I culture, Paleo-Eskimo (around 2000 BC, oldest remains dating from 2400 BC) *Independence II culture, Paleo-Eskimo (800 BC to 200 BC) *Thule culture (ancestral to the modern Inuit, around AD 1300) Peary's explorations The area is named after Robert E. Peary, who first explored it during his expedition of 1891 to 1892. Originally, Peary Land was believed to be an island, separated from the main island by the so-called Peary Channel, an assumed connection between Nordenskiöld Fjord and Independe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Børglum River
The Børglum River ( da, Børglum Elv) is a river in Peary Land, Greenland. It is the largest river in Greenland. Administratively it is part of the Northeast Greenland National Park. The Børglum River Formation is named after the river. Fossils dating back to the Ordovician have been found in it. The Børglum River Formation was deposited in the paleoequatorial marginal seas of Laurentia during the Katian. Course The Børglum River is formed on the southern slopes of the Nordkrone. After leaving the mountains it heads roughly southwards across the desolate territories of the western limit of Melville Land, an unglaciated area. Finally it bends southwestwards and joins the left side of the Brønlund Fjord from its mouth in the Independence Fjord. The river receives many tributaries along its course. The river was first mapped by Danish Arctic explorer Lauge Koch during his Cartographic Air Expedition of 1938. He named it after the medieval Børglum Abbey in Denmark. See al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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