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''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
There are currently 32 described species in this genus. Additionally, a few undescribed species are known.
* ''
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to theAmazon 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 Bolivi ...
(including the Tocantins
Tocantins () is one of the 26 states of Brazil. It is the newest state, formed in 1988 and encompassing what had formerly been the northern two-fifths of the state of Goiás. Tocantins covers and had an estimated population of 1,496,880 in 20 ...
system) in Bolivia, Brazil, Colombia, Ecuador and Peru, 7 species are found in river basins flowing into the Gulf of Paria in Colombia and Venezuela (mostly Orinoco
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 wor ...
system, but ''S. mendesi'' in Guanipa and San Juan San Juan, Spanish for Saint John, may refer to:
Places Argentina
* San Juan Province, Argentina
* San Juan, Argentina, the capital of that province
* San Juan, Salta, a village in Iruya, Salta Province
* San Juan (Buenos Aires Underground), ...
), ''S. freemani'' is from the Essequibo Essequibo is the largest traditional region of Guyana but not an administrative region of Guyana today. It may also refer to:
* Essequibo River, the largest river in Guyana
* Essequibo (colony), a former Dutch colony in what is now Guyana;
* Esseq ...
basin in Guyana, ''S. galibi'' is from the Maroni basin in French Guiana and Suriname, and ''S. britskii'' is from the upper Paraná basin in Brazil.de Santana, C. D. and R.P. Vari (2010). Electric fishes of the genus Sternarchorhynchus (Teleostei, Ostariophysi, Gymnotiformes); phylogenetic and revisionary studies. Zool. J. Linn. Soc. 159: 223-371. There are records of ''Sternarchorhynchus'' from the Oyapock on the French Guiana–Brazil border, but their validity and taxonomic
Taxonomy is the practice and science of categorization or classification.
A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...
position is unclear. Most species have relatively small ranges, but a few are more widespread. ''S. mormyrus'' of the Amazon and Orinoco basins is the only that occurs in more than one major river system.
The habitat varies depending on species, but they require well-oxygenated waters. They have been recorded in whitewater
Whitewater forms in a rapid context, in particular, when a river's gradient changes enough to generate so much turbulence that air is trapped within the water. This forms an unstable current that froths, making the water appear opaque and ...
(like the 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 t ...
), blackwater (like Tefé River) and clearwater Clearwater or Clear Water may refer to:
Places Canada
* Clear Water Academy, a private Catholic school located in Calgary, Alberta
* Clearwater (provincial electoral district), a former provincial electoral district in Alberta
* Clearwater, Briti ...
(like the Xingu River). Some species have been found in small streams, less than deep, while others inhabit the main stream of major rivers. ''S. mesensis'' is known from both above-ground and below-ground habitats, but lacks the cavefish adaptions seen in the only true cave knifefish, ''Eigenmannia vicentespelaea
''Eigenmannia vicentespelaea'' is a species of weakly electric knifefish in the family Sternopygidae. Native to the São Domingos karst area in central Brazil, it is the only known knifefish to exclusively inhabit caves. Measuring up to lo ...
''. Some change habitat with age; adult ''S. cramptoni'' and ''S. mormyrus'' live in main river channels, but their young are found near the river shore in várzea.
Nine species, all with small ranges in Brazil and most restricted to fast-flowing waters including rapids, are considered threatened
Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...
by Brazil's Ministry of the Environment.Frederico, R.G.; J.D. Olden; J. Zuanon (2016). Climate change sensitivity of threatened, and largely unprotected, Amazonian fishes: Climate change in Amazonian fishes. Aquatic Conserv: Mar. Freshw. Ecosyst. 26: 91–102. The current conservation status of ''S. gnomus'' is unclear, as the only known locality in Venezuela's lower Caroní basin has been flooded by a dam.
Appearance and behavior
They have a relatively long, downwards-pointed and tube-like snout. The adult males of some species have distinct teeth on the outside of the lower jaw, likely used in confrontations with other males. The largest species reach up to in total length, but most are less than half that size and the smallest only reach about . Several species are only known from museum specimens and consequently their living colors are unknown. Where known, the species are generally medium to dark brownish or grayish. They are often darker on the upper part than the lower and some have a pale line on the top of the head, but otherwise they are quite uniformly colored without conspicuous patters. However, at least one species, ''S. cramptoni'', is overall whitish-pink, similar to some other knifefish like ''Compsaraia
''Compsaraia'' is a genus of ghost knifefishes found in tropical South America. There are currently three described species in this genus. They are found deep in large rivers in the Amazon and Orinoco basins, and have small eyes and little pigme ...
'' and '' Orthosternarchus'' that inhabit deep, dark rivers.
Very little is known about their behavior, but limited aquarium observations indicate that at least ''S. goeldii'' is nocturnal
Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite.
Nocturnal creatures generally have highly developed sens ...
. They feed on invertebrates.
Species
There are currently 32 described species in this genus. Additionally, a few undescribed species are known.
* ''Sternarchorhynchus axelrodi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Axelrod's tube-snouted ghost knifefish)
* '' Sternarchorhynchus britskii'' Campos-da-Paz, 2000 (Britski's tube-snouted ghost knifefish)
* ''Sternarchorhynchus caboclo
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Nogueira, 2006 (Cabocolo tube-snouted ghost knifefish )
* ''Sternarchorhynchus chaoi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Chao's tube-snouted ghost knifefish)
* ''Sternarchorhynchus cramptoni
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Crampton's tube-snouted ghost knifefish)
* ''Sternarchorhynchus curumim
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Crampton, 2006 (Curumim tube-snouted ghost knifefish)
* ''Sternarchorhynchus curvirostris
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the Am ...
'' (Boulenger Boulenger is a surname. Notable people with the surname include:
* Benjamin Boulenger (born 1990), French footballer
* Edward George Boulenger (1888–1946), British zoologist, director of aquarium at London Zoo
* George Albert Boulenger (1858–1 ...
, 1887)
* '' Sternarchorhynchus freemani'' de Santana & Vari, 2010 (Freeman's tube-snouted ghost knifefish)
* '' Sternarchorhynchus galibi'' de Santana & Vari, 2010 (Galibi tube-snouted ghost knifefish)
* ''Sternarchorhynchus gnomus
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the Am ...
'' de Santana & Taphorn, 2006 (Gnomus tube-snouted ghost knifefish)
* ''Sternarchorhynchus goeldii
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Goeldi's tube-snouted ghost knifefish)
* '' Sternarchorhynchus hagedornae'' de Santana & Vari, 2010 (Hagedorn's tube-snouted ghost knifefish)
* ''Sternarchorhynchus higuchii
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Higuchi's tube-snouted ghost knifefish)
* ''Sternarchorhynchus inpai
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Inpa tube-snouted ghost knifefish)
* '' Sternarchorhynchus jaimei'' de Santana & Vari, 2010 (Jamei's tube-snouted ghost knifefish)
* '' Sternarchorhynchus kokraimoro'' de Santana & Vari, 2010 (Kokraimoro tube-snouted ghost knifefish)
* ''Sternarchorhynchus mareikeae
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Mareike's tube-snouted ghost knifefish)
* '' Sternarchorhynchus marreroi'' de Santana & Vari, 2010 (Marrero's tube-snouted ghost knifefish)
* ''Sternarchorhynchus mendesi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Mendes’ tube-snouted ghost knifefish)
* '' Sternarchorhynchus mesensis'' Campos-da-Paz, 2000 (Mesensis tube-snouted ghost knifefish)
* ''Sternarchorhynchus montanus
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Montane tube-snouted ghost knifefish )
* '' Sternarchorhynchus mormyrus'' (Steindachner
Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoologist, ichthyologist, and herpetologist. He published over 200 papers on fishes and over 50 papers on reptiles and amphibians. Steindachner describ ...
, 1868)
* '' Sternarchorhynchus oxyrhynchus'' ( J. P. Müller & Troschel Franz Hermann Troschel (10 October 1810 – 6 November 1882) was a German zoologist born in Spandau.
He studied mathematics and natural history at the University of Berlin, where he was awarded his doctorate in 1834.Beolens, Bo; Watkins, Michael; ...
, 1849)
* ''Sternarchorhynchus retzeri
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the Am ...
'' de Santana & Vari, 2010 (Retzer's tube-snouted ghost knifefish)
* ''Sternarchorhynchus roseni
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the Am ...
'' Mago-Leccia, 1994 (Rosen's tube-snouted ghost knifefish)
* ''Sternarchorhynchus schwassmanni
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010
* '' Sternarchorhynchus severii'' de Santana & Nogueira, 2006 (Severi's tube-snouted ghost knifefish)
* ''Sternarchorhynchus starksi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Stark's tube-snouted ghost knifefish)
* '' Sternarchorhynchus stewarti'' de Santana & Vari, 2010 (Stewart's tube-snouted ghost knifefish)
* ''Sternarchorhynchus taphorni
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Taphorn's tube-snouted ghost knifefish)
* ''Sternarchorhynchus villasboasi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Villasboas’ tube-snouted ghost knifefish)
* ''Sternarchorhynchus yepezi
''Sternarchorhynchus'' is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.
Distribution, habitat and conservation
Of the 32 recognized species, more than are restricted to the A ...
'' de Santana & Vari, 2010 (Yepez’ tube-snouted ghost knifefish)
References
{{Taxonbar, from=Q634707 Apteronotidae Fish of South America Freshwater fish genera Taxa named by François-Louis Laporte, comte de Castelnau