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Aequidens Tetramerus
The saddle cichlid (''Aequidens tetramerus'') is a species of cichlid from the Tribe (biology), tribe Cichlasomatini, part of the subfamily Cichlasomatinae from South America. It is the type species of the genus ''Aequidens''. It is reasonably common in the aquarium trade. Description The saddle cichlid shows significant variation in colour and thus variation is geographic. In the western parts of its range, in Ecuador and Peru they develop striking red or orange colouration on the lower jaw, the head and the forward portion of the belly while Brazilian specimens are more of an overall grey or blue or green colouration. The males grow larger than the females and they usually grow extensions to the dorsal fin, dorsal, caudal fin, caudal and anal fins as they reach sexual maturity. In Spawn (biology), spawning condition the males are more brightly coloured than the females. The maximum recorded length of the saddle cichlid is . Distribution The saddle cichlid is the most widely dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Jakob Heckel
Johann Jakob Heckel (23 January 1790 – 1 March 1857) was an Austrian taxidermist, zoologist, and ichthyologist from Mannheim in the Electoral Palatinate. Life Though not a formally trained biologist, he worked his way up through the ranks to eventually become the director of the Fish Collection at the Naturhistorisches Museum in Vienna. For the most part, he was not a traveler or explorer like many of the scientists of the time, he remained in Vienna, where he studied and catalogued specimens sent to him from the field. Among those who brought specimens to him were Karl Alexander Hügel, Joseph Russegger and Theodor Kotschy — involving collection activities in Kashmir, the Middle East and northeastern Africa that greatly enriched the Vienna museum. Fish were his specialty and he worked with many of the greatest ichthyologists of his time including Cuvier, Valenciennes, Bonaparte, Müller, and Troschel. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazon River
The Amazon River (, ; es, Río Amazonas, pt, Rio Amazonas) in South America is the largest river by discharge volume of water in the world, and the disputed longest river system in the world in comparison to the Nile. The headwaters of the Apurímac River on Nevado Mismi had been considered for nearly a century as the Amazon basin's most distant source, until a 2014 study found it to be the headwaters of the Mantaro River on the Cordillera Rumi Cruz in Peru. The Mantaro and Apurímac rivers join, and with other tributaries form the Ucayali River, which in turn meets the Marañón River upstream of Iquitos, Peru, forming what countries other than Brazil consider to be the main stem of the Amazon. Brazilians call this section the Solimões River above its confluence with the Rio Negro forming what Brazilians call the Amazon at the Meeting of Waters ( pt, Encontro das Águas) at Manaus, the largest city on the river. The Amazon River has an average discharge of abo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krobia
Krobia (german: Kröben) is a town situated in the western part of Poland, in Greater Poland Voivodeship. Center of small folklore region - Biskupizna. History Within the Kingdom of Poland, Krobia was a private church town, administratively located in the Kościan County in the Poznań Voivodeship in the Greater Poland Province of the Polish Crown. Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the town was occupied by Germany until 1945 and local Poles were subjected to various crimes. On October 21, 1939, the German '' Einsatzgruppe VI'' carried out a public execution of 15 Poles at the main square as part of the ''Intelligenzaktion''. The victims were craftsmen and local officials from Krobia and farmers and landowners from nearby villages. It was one of many massacres of Poles committed by Germany on October 20–23 across the region in attempt to pacify and terrorize the Polish population. In December 1939, the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyly
In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic group (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 Synapomorphy and apomorphy, synapomorphies and symplesiomorphy, symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term was coined by Willi Hennig to apply to well-known taxa like Reptilia (reptiles) which, as commonly named and traditionally defined, is paraphyletic with respect to mammals and birds. Reptilia contains the last common ancestor of reptiles a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nomen Dubium
In binomial nomenclature, a ''nomen dubium'' (Latin for "doubtful name", plural ''nomina dubia'') is a scientific name that is of unknown or doubtful application. Zoology In case of a ''nomen dubium'' it may be impossible to determine whether a specimen belongs to that group or not. This may happen if the original type series (i. e. holotype, isotype, syntype or paratype) is lost or destroyed. The zoological and botanical codes allow for a new type specimen, or neotype, to be chosen in this case. A name may also be considered a ''nomen dubium'' if its name-bearing type is fragmentary or lacking important diagnostic features (this is often the case for species known only as fossils). To preserve stability of names, the ''International Code of Zoological Nomenclature'' allows a new type specimen, or neotype, to be chosen for a ''nomen dubium'' in this case. 75.5. Replacement of unidentifiable name-bearing type by a neotype. When an author considers that the taxonomic identity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cichlasoma
''Cichlasoma'' is a genus of freshwater fish in the cichlid family. The genus was previously very large (a wastebasket taxon), including cichlids from North America, including Central America, and South America. Reclassification and subsequent splitting of the genus by Sven O. Kullander and other ichthyologists has resulted in removing many of the former species from ''Cichlasoma'' to genera such as '' Amphilophus'', '' Archocentrus'', '' Herichthys'', '' Heros'', '' Nandopsis'', '' Parachromis'', '' Thorichthys'', ''Vieja'' and others in the tribe Heroini. Species According to FishBase, there are currently sixteen recognized species in this genus, but three very different Middle American taxa ("''C.''"'' geddesi'' a synonym of '' Herichthys deppii'', and "''C.''"'' istlanum'' and "''C.''"'' trimaculatum'' placed in '' Amphilophus'') are not included by Catalog of Fishes, effectively limiting ''Cichlasoma'' to a group of rather similar, medium-small cichlids of South America. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequidens Cf Tetramerus
''Aequidens'' is a genus of fish in the family Cichlidae found in South America. Formerly a wastebasket genus, as presently defined ''Aequidens'' is largely restricted to the Amazon Basin, Orinoco Basin and river basins in The Guianas. The only exceptions are ''A. plagiozonatus'' which also occurs in the Paraná Basin, and ''A. tetramerus'' which also occurs in the Parnaíba River. Taxonomy Many species formerly placed in this genus have been reallocated to other genera such as ''Andinoacara'', ''Bujurquina'', '' Cleithracara'', ''Krobia'', ''Laetacara'', '' Rondonacara'' and ''Tahuantinsuyoa''.Ottoni, F.P. & Mattos, J.L.O. (2015): Phylogenetic position and re-description of the endangered cichlid ''Nannacara hoehnei'', and description of a new genus from Brazilian Cerrado (Teleostei, Cichlidae, Cichlasomatini). ''Vertebrate Zoology, 65 (1): 65-79.'' Species There are currently 17 recognized species in this genus:Musilová, Z., Říčan, O. & Novák, J. (2009Phylogeny of the Neot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Territoriality
In ethology, territory is the sociographical area that an animal consistently defends against conspecific competition (or, occasionally, against animals of other species) using agonistic behaviors or (less commonly) real physical aggression. Animals that actively defend territories in this way are referred to as being territorial or displaying territorialism. Territoriality is only shown by a minority of species. More commonly, an individual or a group of animals occupies an area that it habitually uses but does not necessarily defend; this is called its home range. The home ranges of different groups of animals often overlap, and in these overlap areas the groups tend to avoid each other rather than seeking to confront and expel each other. Within the home range there may be a ''core area'' that no other individual group uses, but, again, this is as a result of avoidance. Function The ultimate function of animals inhabiting and defending a territory is to increase the indivi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omnivory
An omnivore () is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize the nutrients and energy of the sources absorbed. Often, they have the ability to incorporate food sources such as algae, fungi, and bacteria into their diet. Omnivores come from diverse backgrounds that often independently evolved sophisticated consumption capabilities. For instance, dogs evolved from primarily carnivorous organisms (Carnivora) while pigs evolved from primarily herbivorous organisms (Artiodactyla). Despite this, physical characteristics such as tooth morphology may be reliable indicators of diet in mammals, with such morphological adaptation having been observed in bears. The variety of different animals that are classified as omnivores can be placed into further sub-categories depending on their feeding behaviors. Frugivores in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxbow
__NOTOC__ An oxbow is a U-shaped metal pole (or larger wooden frame) that fits the underside and the sides of the neck of an ox or bullock. A bow pin holds it in place. The term "oxbow" is widely used to refer to a U-shaped meander in a river, sometimes cut off from the modern course of the river that formed it. Developed form Its upper ends pass through a purpose-drilled hole through the bar of the yoke that is held in place into the yoke with a metal screw or key, called a bow pin. Where wood is used it is most often hardwood steamed into shape, especially elm, hickory or willow. A ring, enabling left/right movement controlled from the centre, is attached by a plate to the centre underside of a wooden yoke to enable a pair of bullocks/oxen to be chained to any other pairs in a team and to be hitched to the load behind the animal team. Uses of the yoke and oxbows The load is a plough or any other dragged, non-motorised, field agricultural machinery. Alternative Wooden stav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orinoco River
The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers , with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the world by discharge volume of water. The Orinoco River and its tributaries are the major transportation system for eastern and interior Venezuela and the Llanos of Colombia. The environment and wildlife in the Orinoco's basin are extremely diverse. Etymology The river's name is derived from the Warao term for "a place to paddle", itself derived from the terms ''güiri'' (paddle) and ''noko'' (place) i.e. a navigable place. History The mouth of the Orinoco River at the Atlantic Ocean was documented by Christopher Columbus on 1 August 1498, during his third voyage. Its source at the Cerro Delgado–Chalbaud, in the Parima range, was not explored until 453 years later, in 1951. The source, near the Venezuelan–Brazilian border, at ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Guiana
French Guiana ( or ; french: link=no, Guyane ; gcr, label=French Guianese Creole, Lagwiyann ) is an overseas departments and regions of France, overseas department/region and single territorial collectivity of France on the northern Atlantic Ocean, Atlantic coast of South America in the Guianas. It borders Brazil to the east and south and Suriname to the west. With a land area of , French Guiana is the second-largest Regions of France, region of France (more than one-seventh the size of Metropolitan France) and the largest Special member state territories and the European Union, outermost region within the European Union. It has a very low population density, with only . (Its population is less than that of Metropolitan France.) Half of its 294,436 inhabitants in 2022 lived in the metropolitan area of Cayenne, its Prefectures in France, capital. 98.9% of the land territory of French Guiana is covered by forests, a large part of which is Old-growth forest, primeval Tropical r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
