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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] |
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] |
Exoskeleton
An exoskeleton (from Greek ''éxō'' "outer" and ''skeletós'' "skeleton") is an external skeleton that supports and protects an animal's body, in contrast to an internal skeleton (endoskeleton) in for example, a human. In usage, some of the larger kinds of exoskeletons are known as " shells". Examples of exoskeletons within animals include the arthropod exoskeleton shared by chelicerates, myriapods, crustaceans, and insects, as well as the shell of certain sponges and the mollusc shell shared by snails, clams, tusk shells, chitons and nautilus. Some animals, such as the turtle, have both an endoskeleton and an exoskeleton. Role Exoskeletons contain rigid and resistant components that fulfill a set of functional roles in many animals including protection, excretion, sensing, support, feeding and acting as a barrier against desiccation in terrestrial organisms. Exoskeletons have a role in defense from pests and predators, support and in providing an attachment framework f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erieopterus
''Erieopterus'' is a genus of prehistoric eurypterid found in Silurian to Devonian-aged marine strata of Europe and North America. The genus contains eight species from the Silurian to the Devonian, recovered from both North America and Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ....Dunlop, J. A., Penney, D. & Jekel, D. 2015. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 16.0 http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf (PDF). Species *''Erieopterus eriensis'' (Whitfield, 1882) — Silurian, USA *''Erieopterus hypsophthalmus'' Kjellesvig-Waering, 1958 — Silurian, USA *?''Erieopterus laticeps'' (Schmidt, 1883) — Silurian, Norway *?''Erieopterus limuloides' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xiphos
The ''xiphos'' ( grc, ξίφος ; plural ''xiphe'', grc, ξίφη ) is a double-edged, one-handed Iron Age straight shortsword used by the ancient Greeks. It was a secondary battlefield weapon for the Greek armies after the dory or javelin. The classic blade was generally about long, although the Spartans supposedly preferred to use blades as short as around the era of the Greco-Persian Wars. Etymology Stone's ''Glossary'' has ''xiphos'' being a name used by Homer for a sword. The entry in the book says that the sword had a double-edged blade widest at about two-thirds of its length from the point, and ending in a very long point. The word is attested in Mycenaean Greek Linear B form as , '. A relation to Arabic '' saifun'' ('a sword') and Egyptian ''sēfet'' has been suggested, although this does not explain the presence of a labiovelar in Mycenaean. One suggestion connects Ossetic ''äxsirf'' "sickle", which would point to a virtual Indo-European ''*kwsibhro-''. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exuviae
In biology, exuviae are the remains of an exoskeleton and related structures that are left after ecdysozoans (including insects, crustaceans and arachnids) have moulted. The exuviae of an animal can be important to biologists as they can often be used to identify the species of the animal and even its sex. As studying insects, crustaceans, or arachnids directly is not always possible, and because exuviae can be collected fairly easily, they can play an important part in helping to determine some general aspects of a species' overall life cycle such as distribution, sex ratio, production, and proof of breeding in a habitat. Exuviae have been suggested as a "gold standard" for insect monitoring. For instance, when monitoring dragonfly populations the presence of exuviae of a species demonstrates that the species has completed its full life cycle from egg to adult in a habitat. However, it has also been suggested that the fact that exuviae can be hard to find could lead to an undere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biology Letters
''Biology Letters'' is a peer-reviewed, biological, scientific journal published by the Royal Society. It focuses on the rapid publication of short high quality research articles, reviews and opinion pieces across the biological sciences. ''Biology Letters'' has an average turnaround time of twenty four days from submission to a first decision. The editor-in-chief is Professor David Beerling FRS (University of Sheffield) who is supported by an international Editorial Board of practising scientists. Contents and themes As well as the conventional, short research articles, ''Biology Letters'' has recently published Special Features and Mini Series. While Special Features are a collection of up to 20 articles on a specific theme and published across multiple issues, Mini Series include up to six articles that are published in one issue. Examples of topics in these formats include ocean acidification, fossils, extinction, enhanced rock weathering and the evolutionary ecology of sp ... [...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] |
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] |
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] |
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] |
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] |
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] |
