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Cutlassfishes
The cutlassfishes are about 45 species of predatory ray-finned fish in the family Trichiuridae of the order Scombriformes found in seas throughout the world. Fish of this family are long, slender, and generally steely blue or silver in colour, giving rise to their name. They have reduced or absent pelvic and caudal fins, giving them an eel-like appearance, and large fang-like teeth. Some of the species are known as scabbardfishes or hairtails; others are called frostfishes because they appear in late autumn and early winter, around the time of the first frosts. The earliest known remains of cutlassfish are isolated teeth assigned to ''Eutrichiurides'' from the Early Paleocene of Morocco, the United States, and Angola, although their affinities are subject to question. The earliest known body fossil of a cutlassfish is a specimen tentatively assigned to '' Anenchelum'' from the Early Eocene of Italy. Classification This list of species follows FishBase: * Subfamily Aphanopidin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eupleurogrammus
''Eupleurogrammus'' is a genus of cutlassfish from the Indo-Pacific region. They are benthopelagic fishes which occur mainly over the continental shelf where they move upwards in the water column towards the surface at night and feed on small fishes, squid and crustaceans. They have very elongated and highly compressed bodies which tapers towards a posterior point. Species There are two species in the genus ''Eupleorogrammus'': * '' Eupleurogrammus glossodon'', ( Bleeker, 1860) (Longtooth hairtail) * '' Eupleurogrammus muticus'', (Gray Grey (more frequent in British English) or gray (more frequent in American English) is an intermediate color between black and white. It is a neutral or achromatic color, meaning that it has no chroma. It is the color of a cloud-covered s ..., 1831) (Smallhead hairtail) References Trichiuridae Marine fish genera {{Scombroidei-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lepidopus
''Lepidopus'' is a genus of cutlassfishes. Fossil record These fishes lived from the Oligocene to Quaternary (from 33.9 to 1.806 million years ago). Fossils have been found in Italy, Cyprus, Greece, Azerbaijan, the Czech Republic, Germany and Hungary. Species Species within this genus include: * ''Lepidopus altifrons'', Parin & Collette, 1993 (Crested scabbardfish) * ''Lepidopus calcar'', Parin & Mikhailin, 1982 (Hawaiian ridge scabbardfish) * ''Lepidopus caudatus'', (Bengt Anders Euphrasén, Euphrasen, 1788) (Silver scabbardfish) * ''Lepidopus dubius'', Parin & Mikhailin, 1981 (Doubtful scabbardfish) * ''Lepidopus fitchi '', Rosenblatt & Wilson, 1987 (Fitch's scabbardfish) * ''Lepidopus manis'', Rosenblatt & Wilson, 1987 (Ghost scabbardfish) Bibliography * D'Onghia, G., F. Mastrototaro i P. Maiorano, 2000. Biology of silver scabbard fish, Lepidopus caudatus (Trichiuridae), from the Ionian Sea (Eastern-Central Mediterranean). Cybium 24(3):249-262. * Fritzsche, R.A., 1982. Ost ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lepturacanthus
Lepturacanthus is a genus of cutlassfish from the Indo-Pacific region. They are benthopelagic species of waters over the continental shelf, it is a predator of a variety of small coastal fishes, squid A squid (: squid) is a mollusc with an elongated soft body, large eyes, eight cephalopod limb, arms, and two tentacles in the orders Myopsida, Oegopsida, and Bathyteuthida (though many other molluscs within the broader Neocoleoidea are also ... and crustaceans. Species The following species comprise the genus ''Lepturacanthus'': * '' Lepturacanthus pantului'', (Gupta, 1966) (Coromandel hairtail) * '' Lepturacanthus roelandti'' ( Bleeker, 1860) * '' Lepturacanthus savala'', ( Cuvier, 1829) (Savalani hairtail) References Trichiuridae Marine fish genera {{Scombroidei-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assurger
The razorback scabbardfish, ''Assurger anzac'', is a rare species of cutlassfish, family Trichiuridae, and the only member of its genus. It has been caught from scattered locations worldwide: in the Atlantic Ocean it is known from off Puerto Rico, Uruguay, and the Walvis Ridge, in the Indian Ocean it is known from off western Australia, and in the Pacific Ocean it is known from off New Guinea, southern Japan, Midway Island, California, and the Nazca and Sala y Gomez Ridges. Adults are thought to be benthopelagic, occurring at a depth of , while juveniles are found near the surface or in midwater. This fish has a very long and thin body, measuring 25 to 28 times as long as deep and 12 to 14 times as long as the head. The dorsal profile of the head is straight or slightly convex, with a prominent sagittal crest. The eye diameter is about one-eighth the head length. The lower jaw juts out past the upper, and both jaws are tipped with a short dermal process. There are three pair ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scombriformes
Scombriformes, also known as Pelagia and Pelagiaria, is an order of ray-finned fish within the clade Percomorpha. It contains 287 extant species in 16 families, most of which were previously classified under the suborders Scombroidei and Stromateoidei of the order Perciformes. The earliest known scombriform is the scombrid '' Landanichthys'' from the Middle Paleocene of Angola. Taxonomy Scombriformes includes the following families: * Suborder Stromateoidei ** Family Amarsipidae (amarsipa) ** Family Centrolophidae (medusafishes) ** Family Nomeidae (driftfishes) ** Family Tetragonuridae (squaretails) ** Family Ariommatidae (ariommas) ** Family Stromateidae (butterfishes) * Suborder Scombroidei ** Family Pomatomidae (bluefishes) ** Family Icosteidae (ragfish) ** Family Arripidae (Australasian salmon (kahawai)) ** Family Chiasmodontidae (swallowers) ** Family Scombridae *** Subfamily Gasterochismatinae (butterfly kingfish) *** Subfamily Scombrinae (mackerels, bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelvic Fin
Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hindlimbs of tetrapods, which evolved from lobe-finned fish during the Middle Devonian. Structure and function Structure In actinopterygians, the pelvic fin consists of two endochondrally-derived bony girdles attached to bony radials. Dermal fin rays ( lepidotrichia) are positioned distally from the radials. There are three pairs of muscles each on the dorsal and ventral side of the pelvic fin girdle that abduct and adduct the fin from the body. Pelvic fin structures can be extremely specialized in actinopterygians. Gobiids and lumpsuckers modify their pelvic fins into a sucker disk that allow them to adhere to the substrate or climb structures, such as waterfalls. In priapiumfish, males have modified their pelvic structures into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caudal Fin
Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only by muscles. Fish fins are distinctive anatomical features with varying structures among different clades: in ray-finned fish (Actinopterygii), fins are mainly composed of bony spines or rays covered by a thin stretch of scaleless skin; in lobe-finned fish (Sarcopterygii) such as coelacanths and lungfish, fins are short rays based around a muscular central bud supported by jointed bones; in cartilaginous fish (Chondrichthyes) and jawless fish (Agnatha), fins are fleshy " flippers" supported by a cartilaginous skeleton. Fins at different locations of the fish body serve different purposes, and are divided into two groups: the midsagittal ''unpaired fins'' and the more laterally located ''paired fins''. Unpaired fins are predominan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danian
The Danian is the oldest age or lowest stage of the Paleocene Epoch or Series, of the Paleogene Period or System, and of the Cenozoic Era or Erathem. The beginning of the Danian (and the end of the preceding Maastrichtian) is at the Cretaceous–Paleogene extinction event . The age ended , being followed by the Selandian. Stratigraphic definitions The Danian was introduced in scientific literature by German-Swiss geologist Pierre Jean Édouard Desor in 1847 following a study of fossils found in France and Denmark.Danien Den Store Danske Encyklopædi He identified this stage in deposits from [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Eocene
In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the Lower Eocene (Early Eocene). Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. The Ypresian is additionally marked by another warming event called the Early Eocene Climatic Optimum (EECO). The EECO is the longest sustained warming event in the Cenozoic record, lasting about 2–3 million years between 53 and 50 Ma. The interval is characterized by low oxygen-18 isotopes, high levels of atmospheric pCO2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FishBase
FishBase is a global species database of fish species (specifically finfish). It is the largest and most extensively accessed online database on adult finfish on the web.Marine Fellow: Rainer Froese ''Pew Environment Group''. Over time it has "evolved into a dynamic and versatile ecological tool" that is widely cited in scholarly publications. FishBase provides comprehensive species data, including information on , geographical distribution, biometrics and morpholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
