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Babelichthys
''Babelichthys'' is an extinct genus of crestfish from the ?Priabonian, Late Eocene-aged Pabdeh Formation of Western Iran. It contains a single species, ''Babelichthys olneyi''. The type specimen was initially figured by Camille Arambourg as a second, poorly-preserved specimen of the co-occurring crestfish ''Protolophotus'', but in 2017 it was identified as its own distinct taxon. The single known specimen consists of a head and the front-most region of the dorsal fin, preserving the extremely elongated and enlarged first dorsal-fin ray. It has been inferred that ''Babelichthys'' had a highly elongated "crest" at the front of its dorsal fin that projected horizontally forwards like a horn, akin to that of the extant Eumecichthys, unicorn crestfish (''Eumecichthys fiski'') but even larger and more elongated. It and the unicorn crestfish are each other's closest known relatives. However, some studies find Lophotidae to be Paraphyly, paraphyletic, and place ''Babelichthys'' as an in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crestfish
Crestfishes, family Lophotidae, are lampriform fishes found in most oceans. It consists of two extant and four extinct genera. They are elongated, ribbon-like fishes, silver in color, found in deep tropical and subtropical waters worldwide. Their scientific name is from Greek language, Greek ''lophos'' meaning "crest" and refer to the crest (part of the dorsal fin) that emerges from the snout and head; this structure gives them their other name of unicorn fishes. The extant genera all possess ink sacs that open into their cloacae from which they can produce a cloud of black ink when threatened (as in many cephalopods). Genera References Lophotidae Animal families {{Lampriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pabdeh Formation
The Pabdeh Formation is a Eocene, Late Eocene to Rupelian, Early Oligocene-aged geological formation in Iran. It outcrops along the Zagros Mountains. It was deposited in a deepwater environment in the upper Bathypelagic zone, bathyal zone of the Paratethys, Paratethys Sea, with these abyssal sediments being lifted high above sea level from the Tectonic uplift, uplift of the Zagros fold and thrust belt as part of the Alpine orogeny, Alpide orogeny. A high number of fossil fishes are known from this formation, the majority of which appear to have pelagic and deepwater affinities. These are mostly known from two localities near Elam and Istehbanat. The age of these localities have been disputed, and have previously been considered to be Early Oligocene, but are now generally thought to be middle to late Eocene in age, most likely Priabonian. Some fossils of migratory insects (a locust and ant alates), as well as fish and birds, are also known from presumed early Oligocene-aged strata ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eumecichthys
''Eumecichthys fiski'', the unicorn crestfish or unicornfish, is a very rare, little-known species of crestfish in the family Lophotidae, and the only member of the genus ''Eumecichthys''. It likely has a worldwide distribution, having been first discovered offshore of Kalk Bay, South Africa, and subsequently reported from the Sea of Japan, southwest Florida, Clarion Island off Mexico, Hawaii, and India. A report from the Bering Sea may have been in error. It is found in the bathypelagic zone, at a depth of around 1,000 m (3,300 ft). This fish has ribbon-like body measuring up to 150 cm (59 in) in length. Its common name comes from a horn-like supraoccipital process projecting forward of its eyes. The upper jaw is protrusible, and the jaws contain small conical teeth. The dorsal fin runs along the entire length of the body and contains 310-392 fin ray, soft rays; the first three to five dorsal rays at the tip of the projecting ridge are elongated into a pennant. The p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''Ēṓs'', 'Eos, Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isoto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lampriformes
Lampriformes is an order (biology), order of Actinopterygii, ray-finned fish. Members are collectively called lamprids (which is more properly used for the Opah, Lampridae) or lampriforms, and unite such open-ocean and partially Deep sea, deep-sea Teleostei as the crestfishes, oarfish, opahs, and ribbonfishes. A synonym (biology), synonym for this order is Allotriognathi, while an often-seen, but apparently incorrect, spelling variant is Lampridiformes. They contain seven extant family (biology), families which are generally small but highly distinct, and a mere 12 lampriform genera with some 20 species altogether are recognized. They are the only extant members of the superorder Lamprimorpha, which was formerly diverse throughout much of the Late Cretaceous. The Binomial nomenclature, scientific name literally means "shaped (like the) bright (one)", as "lampr-", meaning bright, comes from ''lampris'', the generic name for the opah. In contrast, most other living lampriforms are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene Fish Of Asia
The Eocene ( ) is a geological epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''Ēṓs'', 'Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Priabonian Genera
The Priabonian is, in the ICS's geologic timescale, the latest age or the upper stage of the Eocene Epoch or Series. It spans the time between . The Priabonian is preceded by the Bartonian and is followed by the Rupelian, the lowest stage of the Oligocene. '' Priabona'', an extinct dipteran of Pipunculidae family, is named after Priabonian, the age of deposits from which this insect is known. History and naming The Priabonian Stage was introduced in scientific literature by Ernest Munier-Chalmas and Albert de Lapparent in 1893. The stage is named after the small hamlet of Priabona in the community of Monte di Malo, in the Veneto region of northern Italy. Stratigraphic definition The base of the Priabonian Stage is at the first appearance of calcareous nannoplankton species '' Chiasmolithus oamaruensis'' (which forms the base of nanoplankton biozone NP18). An official GSSP was ratified in 2020, and was placed in the Alano di Piave section in Alano di Piave, Belluno, Italy. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Prehistoric Ray-finned Fish Genera
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical system. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyly
Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic grouping (a clade) includes a common ancestor and ''all'' of its descendants. The terms are commonly used in phylogenetics (a subfield of biology) and in the tree model of historical linguistics. Paraphyletic groups are identified by a combination of synapomorphies and symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term received currency during the debates of the 1960s and 1970s accompanying the rise of cladistics, having been coined by zoologist Willi Hennig to apply to well-known taxa like Reptilia (reptiles), which is paraphyletic with respect to birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Hitchhiker's Guide To The Galaxy (novel)
''The Hitchhiker's Guide to the Galaxy'' is the first book in the '' Hitchhiker's Guide to the Galaxy'' comedy science fiction "trilogy of five books" by Douglas Adams with a sixth book written by Eoin Colfer. The novel is an adaptation of the first four parts of Adams's radio series of the same name, centring on the adventures of the only man to survive the destruction of Earth. While roaming outer space, he comes to learn the truth behind Earth's existence. The novel was first published in London on 12 October 1979. It sold 250,000 copies in the first three months. The namesake of the novel is ''The Hitchhiker's Guide to the Galaxy'', a fictional guide book for hitchhikers (inspired by the '' Hitch-hiker's Guide to Europe'') written in the form of an encyclopaedia. Plot summary The novel opens with an introduction describing the human race as a primitive and deeply unhappy species, while also introducing an electronic encyclopedia called the ''Hitchhiker's Guide to the G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taeniosomi
Lampriformes is an order of ray-finned fish. Members are collectively called lamprids (which is more properly used for the Lampridae) or lampriforms, and unite such open-ocean and partially deep-sea Teleostei as the crestfishes, oarfish, opahs, and ribbonfishes. A synonym for this order is Allotriognathi, while an often-seen, but apparently incorrect, spelling variant is Lampridiformes. They contain seven extant families which are generally small but highly distinct, and a mere 12 lampriform genera with some 20 species altogether are recognized. They are the only extant members of the superorder Lamprimorpha, which was formerly diverse throughout much of the Late Cretaceous. The scientific name literally means "shaped (like the) bright (one)", as "lampr-", meaning bright, comes from ''lampris'', the generic name for the opah. In contrast, most other living lampriforms are actually ribbon-like and not very similar to the disc-shaped opahs in habitus. They are, however, quite dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
