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Humboldtichthys
''Humboldtichthys'' is an extinct genus of Glass Knifefish from the Miocene Yecua Formation of Bolivia. A single species is currently recognized: ''Humboldtichthys kirschbaumi''. History and naming The earliest remains of gymnotiform electric fish were discovered in the Bolivian Yecua Formation 95 km west-northwest of Santa Cruz by petroleum geologists and easily recognized to belong to a gymnotiform fish based on several characteristic anatomical features. From material collected, Gayet & Meunier described ''Ellisella kirschbaumi'' in 1991, unaware that the genus name was already occupied by a genus of soft coral (''Ellisella''). The holotype specimen, RL 1596-4, represents an incomplete fragment of the animal, preserving the posterior margin of the skull and anterior elements of the body. An additional six fossils were also referred to the genus by Gayet & Meunier. As the name was already occupied however, the animal was given the genus name ''Humboldtichthys'' in the place of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yecua Formation
The Yecua Formation is a geological Formation in what is now Bolivia. Studies suggest that the Yecua Formation preserves a coastal setting with humid to semiarid floodplains, shorelines and tidal as well as shallow marine environments including marshes, streams, lakes and brackish bodies of water. There may have been a connection to the Amazon Basin The Amazon basin is the part of South America drained by the Amazon River and its tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries of Boli ... or the Paranaense Sea. Bivalves Gastropods Crustaceans Vertebrates References {{Reflist Geologic formations of Bolivia Miocene Series of South America Huayquerian Chasicoan Mayoan Laventan Friasian Colloncuran Neogene Bolivia Fossiliferous stratigraphic units of South America Paleontology in Bolivia Sandstone formations Mudstone formations Lacustrine deposits ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Characiformes
Characiformes is an order of ray-finned fish, comprising the characins and their allies. Grouped in 18 recognized families, more than 2000 different species are described, including the well-known piranha and tetras.; Buckup P.A.: "Relationships of the Characidiinae and phylogeny of characiform fishes (Teleostei: Ostariophysi)", ''Phylogeny and Classification of Neotropical Fishes'', L.R. Malabarba, R.E. Reis, R.P. Vari, Z.M. Lucena, eds. (Porto Alegre: Edipucr) 1998:123-144. Taxonomy The Characiformes form part of a series called the Otophysi within the superorder Ostariophysi. The Otophysi contain three other orders, Cypriniformes, Siluriformes, and Gymnotiformes. The Characiformes form a group known as the Characiphysi with the Siluriformes and Gymnotiformes. The order Characiformes is the sister group to the orders Siluriformes and Gymnotiformes, though this has been debated in light of recent molecular evidence. Originally, the characins were all grouped within a single f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Ray-finned Fish Genera
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrophytes
Aquatic plants are plants that have adapted to living in aquatic environments ( saltwater or freshwater). They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that grows in or near water and is either emergent, submergent, or floating. In lakes and rivers macrophytes provide cover for fish, substrate for aquatic invertebrates, produce oxygen, and act as food for some fish and wildlife. Macrophytes are primary producers and are the basis of the food web for many organisms. They have a significant effect on soil chemistry and light levels as they slow down the flow of water and capture pollutants and trap sediments. Excess sediment will settle into the benthos aided by the reduction of flow rates caused by the presence of plant stems, leaves and roots. Some plants have the capability of absorbing pollutants into their tissue. Seaweeds are multicellular marine algae and, although their ecological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catfish
Catfish (or catfishes; order Siluriformes or Nematognathi) are a diverse group of ray-finned fish. Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior from the three largest species alive, the Mekong giant catfish from Southeast Asia, the wels catfish of Eurasia, and the piraíba of South America, to detritivores (species that eat dead material on the bottom), and even to a tiny parasitic species commonly called the candiru, ''Vandellia cirrhosa''. Neither the armour-plated types nor the naked types have scales. Despite their name, not all catfish have prominent barbels or "whiskers". Members of the Siluriformes order are defined by features of the skull and swimbladder. Catfish are of considerable commercial importance; many of the larger species are farmed or fished for food. Many of the smaller species, particularly the genus '' Corydoras'', are important in the aquarium hobby. Many catfish are nocturnal, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Characidae
Characidae, the characids or characins is a family of freshwater subtropical and tropical fish, belonging to the order Characiformes. The name "characins" is the historical one, but scientists today tend to prefer "characids" to reflect their status as a by and large monophyletic group at family rank. To arrive there, this family has undergone much systematic and taxonomic change. Among those fishes that remain in the Characidae for the time being are the tetras, comprising the very similar genera '' Hemigrammus'' and '' Hyphessobrycon'', as well as a few related forms such as the cave and neon tetras. Fish of this family are important as food and also include popular aquarium fish species. These fish vary in length, though many are less than . One of the smallest species, ''Hyphessobrycon roseus'', grows to a maximum length of 1.9 cm. These fish inhabit a wide range and a variety of habitats. They originate in the Americas, ranging from southwestern Texas and Mexico th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhabdolichops
''Rhabdolichops'' is a genus of glass knifefishes found in Amazon, Orinoco and Maroni basins in tropical South America. They live near the bottom in main river channels, floodplains (including flooded forest like igapó) and lagoons, and are typically found in relatively deep waters. ''Rhabdolichops'' are typically overall grayish, dusky or semi-translucent resulting in whitish/pinkish color. There are two species groups: One (including most species) where the pectoral fins are relatively short and without conspicuous pigmentation, and another (including ''R. lundbergi'' and ''R. nigrimans'') where they are relatively long and all dark or dark at the tip. Depending on the exact species, they have a maximum total length of . They feed on small invertebrates such as aquatic insect larvae and zooplankton. Species There are currently 10 species in this genus: * ''Rhabdolichops caviceps'' ( Fernández-Yépez, 1968) * ''Rhabdolichops eastwardi'' Lundberg & Mago-Leccia, 1986 * ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eigenmannia
''Eigenmannia'' is a genus of fish in the family Sternopygidae (glass knifefishes) native to tropical and subtropical South America (south to the Río de la Plata Basin), and Panama.Peixoto, L.A.W., Dutra, G.M. & Wosiacki, W.B. (2015). The Electric Glass Knifefishes of the ''Eigenmannia trilineata'' species-group (Gymnotiformes: Sternopygidae): monophyly and description of seven new species. ''Zoological Journal of the Linnean Society, 175 (2): 384–414.'' They are typically found in slow-flowing streams, along the edge of large rivers, in deep river channels and in floodplains, and the genus also includes ''E. vicentespelaea'', the only cave-adapted knifefish. ''Eigenmannia'' are often found near submerged roots, aquatic plants and floating meadows. Depending on the exact species, they have a maximum total length of . They are nocturnal, and feed on small invertebrates such as aquatic insect larvae and zooplanktonic crustaceans. Species These are the currently recogniz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distocyclus
''Distocyclus '' is a genus of South American glass knifefishes, with one species in the Amazon basin and another in rivers in French Guiana.Meunier, F.J., Jégu, M. & Keith, P. (2014): ''Distocyclus guchereauae'' a new species of Neotropical electric fish, (Gymnotiformes: Sternopygidae), from French Guiana. ''Cybium, 38 (3): 223-230''. Species There are currently two recognized species in this genus. A third species has sometimes been recognized, but it is better placed in the genus ''Eigenmannia'' as '' E. goajira'', although its exact taxonomic position is unresolved. * '' Distocyclus conirostris'' C. H. Eigenmann & W. R. Allen, 1942 * '' Distocyclus guchereauae'' Meunier, Jégu & Keith Keith may refer to: People and fictional characters * Keith (given name), includes a list of people and fictional characters * Keith (surname) * Keith (singer), American singer James Keefer (born 1949) * Baron Keith, a line of Scottish barons ..., 2014 References Sternopygida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archolaemus
''Archolaemus'' is a genus of South American glass knifefishes. They occur in fast-flowing sections of rivers, including rapids, in the Amazon, Tocantins, São Francisco and Araguari Araguari is a municipality in western Minas Gerais state, Brazil. It is in the northern Triângulo Mineiro region, on the Jordão River, a tributary of the Paranaíba River, at an elevation between . The municipality of Araguari has an area of , w ... basins. Depending on the exact species, they reach up to about in total length. During the day they hide in rocky crevices, but during the night they are active and feed on small invertebrates such as aquatic insect larvae. Species There are currently six recognized species in this genus: References Sternopygidae Freshwater fish of South America Freshwater fish genera {{Gymnotiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypopomidae
The Hypopomidae are a family of fishes in the order Gymnotiformes known as the bluntnose knifefish. They may also be called grass or leaf knifefishes. These electric fish are not often eaten, of little commercial importance, rarely kept as aquarium fish, and poorly studied; however, species in this family may constitute a significant fraction of the biomass in the areas they inhabit. These fish originate from fresh water in Panama and South America. The Hypopomidae are confined to the humid neotropics, ranging the Río de la Plata of Argentina (35°S) to the Río Tuira of Panama (8°N). Hypopomids are known from the continental waters of all South American countries except Chile, and are most diverse in the Amazon Basin. Description Teeth are absent on the oral jaws. Unlike the closely related Rhamphichthyidae, species of this family do not have a tubular snout, but a blunt, short one. Also, the nostrils are well separated. This family contains the smallest gymnotiforms, ''M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
