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Pentecopterus
''Pentecopterus'' is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils have been registered from the Darriwilian age of the Middle Ordovician period, as early as 467.3 million years ago. The genus contains only one species, ''P. decorahensis'', that is the oldest known eurypterid, surpassing other Ordovician eurypterids, such as ''Brachyopterus'', in age by almost 9 million years. The generic name derives from the penteconter, a warship from ancient Greece, and the suffix -''pterus'', which means "wing" and is often used in other genus of eurypterids. The specific name refers to Decorah, Iowa, where ''Pentecopterus'' was discovered. The genus is classified as part of the Megalograptidae family of eurypterids, a family differentiated from other eurypterids by the possession of two or more pairs of spines per podomere on prosomal appendage IV, a reduction of almost all spines and the large exoskeletons with ovate to triangular scales. It is estimated that '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentecopterus Decorahensis
''Pentecopterus'' is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils have been registered from the Darriwilian age of the Middle Ordovician period, as early as 467.3 million years ago. The genus contains only one species, ''P. decorahensis'', that is the oldest known eurypterid, surpassing other Ordovician eurypterids, such as ''Brachyopterus'', in age by almost 9 million years. The generic name derives from the penteconter, a warship from ancient Greece, and the suffix -''pterus'', which means "wing" and is often used in other genus of eurypterids. The specific name refers to Decorah, Iowa, where ''Pentecopterus'' was discovered. The genus is classified as part of the Megalograptidae family of eurypterids, a family differentiated from other eurypterids by the possession of two or more pairs of spines per podomere on prosomal appendage IV, a reduction of almost all spines and the large exoskeletons with ovate to triangular scales. It is estimated that ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurypterid
Eurypterids, often informally called sea scorpions, are a group of extinct arthropods that form the Order (biology), order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period 467.3 Myr, million years ago. The group is likely to have appeared first either during the Early Ordovician or Late Cambrian period. With approximately 250 species, the Eurypterida is the most diverse Paleozoic Chelicerata, chelicerate order. Following their appearance during the Ordovician, eurypterids became major components of marine faunas during the Silurian, from which the majority of eurypterid species have been described. The Silurian genus ''Eurypterus'' accounts for more than 90% of all known eurypterid specimens. Though the group continued to diversify during the subsequent Devonian period, the eurypterids were heavily affected by the Late Devonian extinction event. They declined in numbers and diversity until becoming extinct during the Permian–Tri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megalograptus
''Megalograptus'' is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of ''Megalograptus'' have been recovered in deposits of Katian (Late Ordovician) age in North America. The genus contains five species: ''M. alveolatus'', ''M. ohioensis'', ''M. shideleri'', ''M. welchi'' and ''M. williamsae'', all based on fossil material found in the United States. Fossils unassigned to any particular species have also been found in Canada. The generic name translates to "great writing" and originates from the mistaken original belief that ''Megalograptus'' was a type of graptolite, often given names ending with -''graptus'' (meaning 'writing'). ''Megalograptus'' was a large predatory megalograptid eurypterid, with the largest and best known species, ''M. ohioensis'', reaching body lengths of . Some species were substantially smaller, with the smallest, belonging to a hitherto undetermined species, only growing to about in length. Morphologically, ''Megalograptus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megalograptidae
Megalograptidae are a family of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions". The megalograptids were likely the first major successful group of eurypterids, evidenced by a Late Ordovician radiation. All known members of the Megalograptidea are from the Late Ordovician of Laurentia with the exception of the large ''Pentecopterus'' from the Middle Ordovician. Description Megalograptids are characterized by large exoskeletons with ovate to triangular scales. The prosoma (head) is subquadrate, with a tonguelike anterior process bearing marginal spines, and compound eyes on the top front of the head. The chelicerae (claws in front of the mouth) are small and short. The first and third pairs of walking legs are short, with diverging or closely spaced spines. The second pair of walking legs is enormously developed, with long paired spines. The fourth pair of walking legs are nearly spineless. The preabdomen, the front portion of the body, is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decorah, Iowa
Decorah is a city in and the county seat of Winneshiek County, Iowa, United States. The population was 7,587 at the time of the 2020 census. Decorah is located at the intersection of State Highway 9 and U.S. Route 52, and is the largest community in Winneshiek County. History Decorah was the site of a Ho-Chunk village beginning ''circa'' 1840. Several Ho-Chunks had settled along the Upper Iowa River that year when the U.S. Army forced them to remove from Wisconsin. In 1848, the United States removed the Ho-Chunks again to a new reservation in Minnesota, opening their Iowa villages to white settlers. The first European-Americans to settle were the Day family from Tazewell County, Virginia. According to local Congregationalist minister Rev. Ephraim Adams, the Days arrived in June 1849 with the Ho-Chunks' "tents still standing—with the graves of the dead scattered about where now run our streets and stand our dwellings." Judge Eliphalet Price suggested that the Days name t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penteconter
The penteconter (alt. spelling pentekonter, pentaconter, pentecontor or pentekontor; el, πεντηκόντερος, ''pentēkónteros'', "fifty-oared"), plural penteconters, was an ancient Greek galley in use since the archaic period. In an alternative meaning, the term was also used for a military commander of fifty men in ancient Greece. History The penteconters emerged in an era when there was no distinction between merchant ships and warships. They were versatile, long-range ships used for sea trade, piracy and warfare, capable of transporting freight or troops. A penteconter was rowed by fifty oarsmen, arranged in a row of twenty-five on each side of the ship. A midship mast with sail could also propel the ship under favourable wind. Penteconters were long and sharp-keeled ships, hence described as ''long vessels'' (, ''nḗes makraí'' ). They typically lacked a full deck, and thus were also called ''unfenced vessels'' (, ''áphraktoi nḗes''). Homer describes war s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darriwilian
The Darriwilian is the upper stage of the Middle Ordovician. It is preceded by the Dapingian and succeeded by the Upper Ordovician Sandbian Stage. The lower boundary of the Darriwilian is defined as the first appearance of the graptolite species ''Undulograptus austrodentatus'' around million years ago. It lasted for about 8.9 million years until the beginning of the Sandbian around million years ago. This stage of the Ordovician was marked by the beginning of the Andean-Saharan glaciation. Naming The name Darriwilian is derived from Darriwil, a parish in County of Grant, Victoria (Australia). The name was proposed in 1899 by Thomas Sergeant Hall. GSSP The GSSP of the Darriwilian is the Huangnitang Section () near the village Huangnitang, 3.5 km southwest of Changshan County Town (Zhejiang, China). It is an outcrop of the Ningkuo Formation, consisting of mainly black shale. The lower boundary of the Darriwilian is defined as the first appearance datum of the graptolite s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strange Truth
Strange may refer to: Fiction * Strange (comic book), a comic book limited series by Marvel Comics * Strange (Marvel Comics), one of a pair of Marvel Comics characters known as The Strangers * Adam Strange, a DC Comics superhero * The title character of the television series ''The Journey of Allen Strange'' * Doc Strange, a Thrilling Comics character * Doctor Strange, a Marvel Comics character ** Stephen Strange (Marvel Cinematic Universe), a film character based on the comic book character * Hugo Strange, a DC Comics character * Jonathan Strange, a magician in the novel ''Jonathan Strange & Mr Norrell'' by Susanna Clarke and the miniseries adaptation Music * ''Strange'' (video), a compilation of music videos by Depeche Mode * Strange Music, a record label founded by Travis O'Guin and rapper Tech N9ne Songs * "Strange" (Celeste song), 2019 * "Strange" (En Vogue song), 1991 * "Strange" (Miranda Lambert song), 2022 * "Strange" (Reba McEntire song), 2009 * "Strange" (Wet Wet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Behance
Behance (stylized as Bēhance) is a social media platform owned by Adobe whose main focus is to showcase and discover creative work. Behance was founded by Matias Corea and Scott Belsky in November 2005. It was acquired by Adobe in December 2012. As of October 2020, Behance had over 24 million members. History Behance was founded by Matias Corea and Scott Belsky in November 2005. The company initially relied on revenue, generating income by selling banner ads, job postings and later, 99U conference tickets. In May 2012, their first round of outside funding received $6.5 million from investors including Dave McClure and Jeff Bezos's personal investment firm, Bezos Expeditions. The company was acquired by Adobe Systems for $150 million in December 2012. In 2021, Behance added a subscription feature for users to sell their tutorials and other services. It also added crypto wallet integration. Corporate affairs Products Users can sign up to Behance and build profiles consisti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tergite
A ''tergum'' (Latin for "the back"; plural ''terga'', associated adjective tergal) is the dorsal ('upper') portion of an arthropod segment other than the head. The anterior edge is called the 'base' and posterior edge is called the 'apex' or 'margin'. A given tergum may be divided into hardened plates or sclerites commonly referred to as tergites. In a thoracic segment, for example, the tergum may be divided into an anterior notum and a posterior scutellum. Lateral extensions of a tergite are known as paranota (Greek for "alongside the back") or ''carinae'' (Latin for "keel"), exemplified by the flat-backed millipedes of the order Polydesmida. Kinorhynchs have tergal and sternal plates too, though seemingly not homologous with those of arthropods. Tergo-tergal is a stridulatory mechanism in which fine spines of the abdominal tergites are rubbed together to produce sound. This process is known as abdominal telescoping. Examples File:Andrena spiraeana abdomen.jpg , Abdominal t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BMC Evolutionary Biology
''BMC Ecology and Evolution'' (since January 2021), previously ''BMC Evolutionary Biology'' (2001–2020), is a peer-reviewed open access scientific journal covering all fields of evolutionary biology, including phylogenetics and palaeontology. It was established in 2001 and is part of a series of BMC journals published by BioMed Central. Abstracting and indexing The journal is abstracted and indexed in: According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 3.260. References External links * BioMed Central academic journals Creative Commons Attribution-licensed journals {{biology-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaekelopterus
''Jaekelopterus'' is a genus of predatory eurypterid, a group of extinct aquatic arthropods. Fossils of ''Jaekelopterus'' have been discovered in deposits of Early Devonian age, from the Pragian and Emsian stages. There are two known species: the type species ''J. rhenaniae'' from brackish to fresh water strata in the Rhineland, and ''J. howelli'' from estuarine strata in Wyoming. The generic name combines the name of German paleontologist Otto Jaekel, who described the type species, and the Greek word πτερόν (''pteron'') meaning "wing". Based on the isolated fossil remains of a large chelicera (claw) from the Klerf Formation of Germany, ''J. rhenaniae'' has been estimated to have reached a size of around 2.3–2.6 metres (7.5–8.5 ft), making it the largest arthropod ever discovered, surpassing other large arthropods such as fellow eurypterids '' Acutiramus'' and ''Pterygotus'' and the millipede ''Arthropleura''. ''J. howelli'' was much smaller, reaching 80 ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
