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Sternoptyx
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * '' Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * '' Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Diaphana
''Sternoptyx diaphana'', the diaphanous hatchetfish, is a species of deep sea ray-finned fish in the family Sternoptychidae. It is the type species of the genus ''Sternoptyx'', and was first described by the French naturalist Johann Hermann in ''Der Naturforscher'' 1781. Description ''Sternoptyx diaphana'' is a short, deep-bodied fish with a laterally compressed body and a maximum length of about . The mouth is nearly vertical, the snout is short and the eyes are large. The body slopes steeply up from the head and levels off at the caudal peduncle. In front of the dorsal fin is a toothed, pear-shaped translucent plate supported by a single spine. The dorsal fin has 9 to 12 soft rays and the anal fin 13 to 14. There is a translucent fold of skin just below the short tail, and another below the ventral region of the body. There are photophores behind and below the eye, on the gill cover, and rows of photophores on the underside of the fish. The dorsal region is dark, the flanks a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Obscura
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * '' Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Pseudobscura
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * ''Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Pseudodiaphana
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * ''Sternoptyx obscura'' Garman, 1899 * ''Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasecon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Hatchetfish
Marine hatchetfishes or deep-sea hatchetfishes are small deep-sea mesopelagic ray-finned fish of the stomiiform subfamily Sternoptychinae. They should not be confused with the freshwater hatchetfishes, which are not particularly closely related Teleostei in the characiform family Gasteropelecidae. (2006): '' Fishes of the World'' (4th ed.). John Wiley & Sons, Inc. p.209 The scientific name means "''Sternoptyx''-subfamily", from '' Sternoptyx'' (the type genus) + the standard animal family suffix "-inae". It ultimately derives from Ancient Greek ''stérnon'' (στέρνον, "breast") + ''ptýx'' (πτύξ, "a fold/crease") + Latin ''forma'' ("external form"), the Greek part in reference to the thorax shape of marine hatchetfishes. (2006)Family Sternoptychidae Version of 2006-OCT-10. Retrieved 2009-OCT-02. Description and ecology Found in tropical, subtropical and temperate waters of the Atlantic, Pacific and Indian Oceans, marine hatchetfishes range in size from ''Polyip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptychidae
The marine hatchetfishes or deep-sea hatchetfishes as well as the related bottlelights, pearlsides and constellationfishes are small deep-sea ray-finned fish of the stomiiform family Sternoptychidae. They are not closely related to and should not be confused with the freshwater hatchetfishes, which are teleosts in the characiform family Gasteropelecidae. The Sternoptychidae have 10 genera and about 70 species altogether.Nelson (2006): p.209 The scientific name means "''Sternoptyx''-family", from ''Sternoptyx'' (the type genus) + the standard animal family suffix "-idae". The type genus derives from Ancient Greek ''stérnon'' (στέρνον, "breast") + ''ptýx'' (πτύξ, "a fold/crease") + Latin ''forma'' ("external form"), the Greek part in reference to the thorax shape of marine hatchetfishes. Description and ecology Found most often at depths of 200–600 meters in tropical, subtropical and temperate waters of the Atlantic, Pacific and Indian Oceans, marine hatchetfishes ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ray-finned Fish Genera
Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or horny spines (rays), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii (lobe-finned fish). These actinopterygian fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the link or connection between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). By species count, actinopterygians dominate the vertebrates, and they constitute nearly 99% of the over 30,000 species of fish. They are ubiquitous throughout freshwater and marine environments from the deep sea to the highest mountain streams. Extant species can range in size from ''Paedocypris'', at , to the massive ocean sunfish, at , and the long-bodied oarfish, at . The vast majority of Actinop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Rupelian First Appearances
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Extant is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Extant taxon, a taxon which is not extinct, such as an extant species * Extant Theatre Company, a disability arts organisation * ''Extant'' (TV series), an American television series * Hank Hall, also known as Extant, a DC Comics supervillain See also * Extent (other) Extent may refer to: Computing * Extent (file systems), a contiguous region of computer storage medium reserved for a file * Extent File System, a discontinued file system implementation named after the contiguous region * Extent, a chunk of st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Million Years Ago
The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseconds. Usage Myr (million years) is in common use in fields such as Earth science and cosmology. Myr is also used with Mya (million years ago). Together they make a reference system, one to a quantity, the other to a particular place in a year numbering system that is ''time before the present''. Myr is deprecated in geology, but in astronomy ''Myr'' is standard. Where "myr" ''is'' seen in geology it is usually "Myr" (a unit of mega-years). In astronomy it is usually "Myr" (Million years). Debate In geology a debate remains open concerning the use of ''Myr'' (duration) plus ''Ma'' (million years ago) versus using only the term ''Ma''. In either case the term '' Ma'' is used in geology literature conforming to ISO 31-1 (now ISO 80000-3) and NIST 811 recommended practices. Traditional style geology literature is written The "ago" is implied, so that any such year number "X Ma" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Oligocene
The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/Series. It spans the time between . It is preceded by the Priabonian Stage (part of the Eocene) and is followed by the Chattian Stage. Name The stage is named after the small river Rupel in Belgium, a tributary to the Scheldt. The Belgian Rupel Group derives its name from the same source. The name Rupelian was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1850. The separation between the group and the stage was made in the second half of the 20th century, when stratigraphers saw the need to distinguish between lithostratigraphic and chronostratigraphic names. Stratigraphic definition The base of the Rupelian Stage (which is also the base of the Oligocene Series) is at the extinction of the foraminiferan genus ''Hantkenina''. An official GSSP for the base of the Rupelian has been assigned in 1992 (Massignano, Italy). The transi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oksana Dmitrievna Borodulina
Oksana or Oxana (, ; be, Аксана), sometimes transliterated as Aksana, is a female given name of Ukrainian origin. The closest equivalent is the Russian name '' Kseniya'' (russian: Ксения, links=no), but the two names coexist in use in both countries and neither of them is a shortening of the other. Origin The names Oksana (), Xana (), Sana () and Kseniya (russian: Ксения, Xenia) are thought to originate from one of two Greek words: Xenia (hospitality) or Xenos (stranger). the dictionary of Russian names. Axana is another alternative spelling. People Oksana * (born 1987), Russian actress *[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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