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| == Taxonomy == | == Taxonomy == | ||
| ''Trichogenes claviger'' is one of three known species within the ] '']'', and the second to be discovered and described. The first species of the genus, '']'', was described in 1983 from a very local population discovered in an remnant rainforest between the major cities Rio de Janeiro and São Paulo. ''T. longipinnis'' was long considered to be unique; a strikingly distinct fish that is not closely related to any other ] freshwater fish |
''Trichogenes claviger'' is one of three known species within the ] '']'', and the second to be discovered and described. The first species of the genus, '']'', was described in 1983 from a very local population discovered in an remnant rainforest between the major cities Rio de Janeiro and São Paulo. ''T. longipinnis'' was long considered to be unique; a strikingly distinct fish that is not closely related to any other ] freshwater fish.<ref name="pinna2010"/> | ||
| ''T. claviger'' was discovered in 2010 by biologists carried out an assessment for environmental licensing purposes in an remnant rainforest in ], some 1200 km northeast of the ''T. claviger'' population.<ref name="pinna2010"/><ref name="silva2023"/><ref name="iucn"/> Specimens, including the ] (specimen ] 3289) and 17 ]s, were collected in February 2010, and became part of the collections of the {{lang|pt|]}} (MBML) in ] and the {{lang|pt|]}} (MZUSP) in ]. The ] was published later in 2010 by the Brazilian ] Mário C. C. de Pinna and colleagues.<ref name="pinna2010"/> The ] ''Trichogenes'' is composed of the ] words {{lang|grc|thrix}} (meaning {{gloss|hair}}, referring to its family, the Trichomycteridae) and {{lang|grc|genes}} (meaning {{gloss|birth}}, referring to the genus '']'' due to its superficial resemblance to it).<ref name="britski1983"/><ref name="fishbase"/> The ] ''claviger'' is ] for {{gloss|club-bearing}} and refers to the distinctive club-shaped hind part of the ] seen in males.<ref name="pinna2010"/> | ''T. claviger'' was discovered in 2010 by biologists carried out an assessment for environmental licensing purposes in an remnant rainforest in ], some 1200 km northeast of the ''T. claviger'' population.<ref name="pinna2010"/><ref name="silva2023"/><ref name="iucn"/> Specimens, including the ] (specimen ] 3289) and 17 ]s, were collected in February 2010, and became part of the collections of the {{lang|pt|]}} (MBML) in ] and the {{lang|pt|]}} (MZUSP) in ]. The ] was published later in 2010 by the Brazilian ] Mário C. C. de Pinna and colleagues.<ref name="pinna2010"/> The ] ''Trichogenes'' is composed of the ] words {{lang|grc|thrix}} (meaning {{gloss|hair}}, referring to its family, the Trichomycteridae) and {{lang|grc|genes}} (meaning {{gloss|birth}}, referring to the genus '']'' due to its superficial resemblance to it).<ref name="britski1983"/><ref name="fishbase"/> The ] ''claviger'' is ] for {{gloss|club-bearing}} and refers to the distinctive club-shaped hind part of the ] seen in males. De Pinna and colleagues suggested that the populations of ''T. longipinnis'' and ''T. claviger'' must have been isolated for a long period of time given their numerous morphological differences.<ref name="pinna2010"/> | ||
| In 2020, a third species, '']'', was described from three specimens in the collection of the MZUSP; these specimens lack location data and the place of occurrence of the species is unknown.<ref name="pinna2020"/> Within its family, the ] (pencil catfishes), the genus ''Trichogenes'' is most closely related to the ], which are endemic to the ] plateau in northeastern Brazil.<ref name="pinna2010"/> | In 2020, a third species, '']'', was described from three specimens in the collection of the MZUSP; these specimens lack location data and the place of occurrence of the species is unknown.<ref name="pinna2020"/> Within its family, the ] (pencil catfishes), the genus ''Trichogenes'' is most closely related to the ], which are endemic to the ] plateau in northeastern Brazil.<ref name="pinna2010"/> | ||
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| The head is approximately three-quarters as deep as long. In side view, the eyes are positioned slightly anterior to the mid-length of the head, and in top view, the eyes are closer to the outer margin of the head than they are to the body midline. There are three pairs of ] – the down-facing maxillary and rictal barbels and the upward-facing nasal barbels. The maxillary and rictal barbels both originate at the gape of the mouth, and the former reaches up to the base of the pectoral fin. The nasal barbels reach the front margin of the eye when drawn to it. The mouth is ] (facing forwards rather than being upturned or downturned), distinguishing the species from all other members of its family. On each side of the skull, there are 19 to 23 teeth in the ] of the lower jaw and 20 to 22 teeth in the ] of the upper jaw. The teeth are bilobed and arranged in two rows; the teeth of the inner row are smaller.<ref name="pinna2010"/> | The head is approximately three-quarters as deep as long. In side view, the eyes are positioned slightly anterior to the mid-length of the head, and in top view, the eyes are closer to the outer margin of the head than they are to the body midline. There are three pairs of ] – the down-facing maxillary and rictal barbels and the upward-facing nasal barbels. The maxillary and rictal barbels both originate at the gape of the mouth, and the former reaches up to the base of the pectoral fin. The nasal barbels reach the front margin of the eye when drawn to it. The mouth is ] (facing forwards rather than being upturned or downturned), distinguishing the species from all other members of its family. On each side of the skull, there are 19 to 23 teeth in the ] of the lower jaw and 20 to 22 teeth in the ] of the upper jaw. The teeth are bilobed and arranged in two rows; the teeth of the inner row are smaller.<ref name="pinna2010"/> | ||
| The ] (bones that cover the gills) possess two patches of ], or dermal teeth. The largest patch of odontodes is located at the end of a pronounced opercular process (protrusion). In males, it is very elongated and club-like and inspired the name of the species; this feature is not found in any other species of the family. The ] is short, consisting of a succession of four or five tubules that reaches from the back of the head up to the level of the rear margin of the pectoral fin. The ] consists of 35 ].<ref name="pinna2010"/> | The ] (bones that cover the gills) possess two patches of ], or dermal teeth. The largest patch of odontodes is located at the end of a pronounced opercular process (protrusion). In males, it is very elongated and club-like and inspired the name of the species; this feature is not found in any other species of the family. The ] is short, consisting of a succession of four or five tubules that reaches from the back of the head up to the level of the rear margin of the pectoral fin. The ] invariably consists of 35 ], while ''T. longipinnis'' has 38 or 39.<ref name="pinna2010"/> | ||
| == Distribution and habitat == | == Distribution and habitat == | ||
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| ''T. claviger'' is a local ] of the ], the second largest ] of the Americas, and one of the most ] regions in the world. Originally, this forest covered 1.6 million hectares (4 million acres), mostly in Brazil but extending south into parts of Paraguay and Argentina.<ref name="marques2021"/> The species is known from only from the {{lang|pt|]}} (Caetés forest), a remnant of the Atlantic Forest in ], Brazil. Here, the fish lives in small streams that are part of the ] of the ], which is isolated from other catchment areas. The type locality, where it was first discovered, is a small shaded stream named {{lang|pt|Picada Comprida}}, within primary rainforest at an altitude of around 1150 m. This forest is primary, mountainous rainforest interspersed with plantations of exotic trees.<ref name="pinna2010"/> The occurrence of the species in the immediate surroundings of the site appeared to be patchy.<ref name="pinna2010"/> A second locality was discovered in 2019, 4 km away from the type locality, and yet another locality was discovered by a local farmer in 2023.<ref name="silva2023"/> Together, these localities cover an area of over 16 km².<ref name="silva2023"/> | ''T. claviger'' is a local ] of the ], the second largest ] of the Americas, and one of the most ] regions in the world. Originally, this forest covered 1.6 million hectares (4 million acres), mostly in Brazil but extending south into parts of Paraguay and Argentina.<ref name="marques2021"/> The species is known from only from the {{lang|pt|]}} (Caetés forest), a remnant of the Atlantic Forest in ], Brazil. Here, the fish lives in small streams that are part of the ] of the ], which is isolated from other catchment areas. The type locality, where it was first discovered, is a small shaded stream named {{lang|pt|Picada Comprida}}, within primary rainforest at an altitude of around 1150 m. This forest is primary, mountainous rainforest interspersed with plantations of exotic trees.<ref name="pinna2010"/> The occurrence of the species in the immediate surroundings of the site appeared to be patchy.<ref name="pinna2010"/> A second locality was discovered in 2019, 4 km away from the type locality, and yet another locality was discovered by a local farmer in 2023.<ref name="silva2023"/> Together, these localities cover an area of over 16 km².<ref name="silva2023"/> | ||
| ⚫ | == Ecology and Biology == | ||
| At the type locality, the stream containing the fish is ca. 30 cm deep, slow flowing and has brown but clear water. The stream bed is sandy but partly covered with dead leaves and other organic material. It is the only species of fish |
At the type locality, the stream containing the fish is ca. 30 cm deep, slow flowing and has brown but clear water. The stream bed is sandy but partly covered with dead leaves and other organic material. The fishes are ], dwelling in the middle of the water column; ''T. longipinnis'', in contrast, is ground-dwelling. As with ''T. longipinnis'', it is probably ] (active during the day). It is the only species of fish that occurs in its habitat, and it is unknown what prevents other species from entering these habitats. They feed on arthropods, as is the case with the related ''T. longipinnis''.<ref name="pinna2010"/> | ||
| Juveniles differ from adults in having larger eyes, a much shorter snout, a narrower head with a strongly sloping upper surface, and a prognathous mouth (i.e., the lower jaw is larger than the upper jaw). Such marked differences probably indicate differences in ecology between juveniles and adults. Juveniles of ''T. longipinnis'', in contrast, are more similar adults.<ref name="pinna2010"/> | |||
| ⚫ | == Ecology == | ||
| The fishes tend to dwell in the middle of the water column. They feed on arthropods, as is the case with the related ''T. longipinnis''.<ref name="pinna2010"/> | |||
| The conspicuous opercular process is short in |
The conspicuous opercular process is short in females but elongated in males, and therefore ]. In their species description, de Pinna and colleagues suggested that the function of this process is sexual signalling, as the process is movable and bears a black spot on its end. Visual perception appears to be important in ''Trichogenes'' species, and the related ''T. longipinnis'' has been demonstrated to rely solely on sight to detect prey. Several other neotropical freshwater fishes also have a movable black-tipped structure somewhere along the body; this feature therefore ].<ref name="pinna2010"/> | ||
| == Status, threats, and conservation == | == Status, threats, and conservation == | ||
Revision as of 03:02, 19 December 2024
Species of fish
| Trichogenes claviger | |
|---|---|
| |
| Trichogenes claviger | |
| Conservation status | |
 Critically Endangered (IUCN 3.1) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Trichomycteridae |
| Subfamily: | Trichogeninae |
| Genus: | Trichogenes |
| Species: | T. claviger |
| Binomial name | |
| Trichogenes claviger de Pinna, Helmer, Britski & Nunes, 2010 | |
  Mata de Caetés
| |
| Map of Brazil showing the only occurrence | |
Trichogenes claviger is a critically endangered species of pencil catfish native to the Atlantic Forest of Brazil. It was discovered early in 2010 and scientifically described later in the same year. One of three species within the genus Trichogenes, it is restricted to an area of 16 km² in an mountainous area in the Brazilian state of Espírito Santo. When discovered, the rainforst in which it occurs was unprotected and threatened by deforestation, but a private nature reserve has since been established. The species lives in small, shaded, and slow-moving streams in rainforest. A small fish, it is up to 50.8 mm in length.
Taxonomy
Trichogenes claviger is one of three known species within the genus Trichogenes, and the second to be discovered and described. The first species of the genus, T. longipinnis, was described in 1983 from a very local population discovered in an remnant rainforest between the major cities Rio de Janeiro and São Paulo. T. longipinnis was long considered to be unique; a strikingly distinct fish that is not closely related to any other neotropical freshwater fish.
T. claviger was discovered in 2010 by biologists carried out an assessment for environmental licensing purposes in an remnant rainforest in Vargem Alta, Espírito Santo, some 1200 km northeast of the T. claviger population. Specimens, including the holotype (specimen MBML 3289) and 17 paratypes, were collected in February 2010, and became part of the collections of the Museu de Biologia Mello Leitão (MBML) in Santa Teresa and the Museu de Zoologia da Universidade de São Paulo (MZUSP) in São Paulo. The species description was published later in 2010 by the Brazilian ichthyologist Mário C. C. de Pinna and colleagues. The generic name Trichogenes is composed of the greek words thrix (meaning 'hair', referring to its family, the Trichomycteridae) and genes (meaning 'birth', referring to the genus Helogenes due to its superficial resemblance to it). The specific name claviger is Latin for 'club-bearing' and refers to the distinctive club-shaped hind part of the operculum seen in males. De Pinna and colleagues suggested that the populations of T. longipinnis and T. claviger must have been isolated for a long period of time given their numerous morphological differences.
In 2020, a third species, Trichogenes beagle, was described from three specimens in the collection of the MZUSP; these specimens lack location data and the place of occurrence of the species is unknown. Within its family, the Trichomycteridae (pencil catfishes), the genus Trichogenes is most closely related to the Copionodontinae, which are endemic to the Chapada Diamantina plateau in northeastern Brazil.
Description
T. claviger is a small fish; 18 collected specimens were between 15.9 and 50.8 mm in standard length (measured from the snout to the end of the vertebral column). The body is deeper than broad; it is deepest at the abdomen and decreases in depth towards the tail. This results in convex upper and lower margins in side view, different from the more parallel upper and lower margins in T. longipinnis. There are five types of fins: A pair of pectoral fins behind the head, a pair of pelvic fins behind the abdomen, the dorsal fin of the back, the caudal fin of the tail, and the anal fin between the pectoral and caudal fins. The pectoral fin is relatively large and consists of 9 or 10 fin rays. The pelvic fin has 5 or 6 rays. The dorsal fin is comparatively small and situated closer to the caudal fin than to the snout. The anal fin is extensive with a straight or convex lower margin; it has 32 to 35 unbranched rays. The upper half of the caudal fin has 9 or 10 rays, while the lower half has 6 or 7 rays.
The body sports dark spots on its sides that are less numerous than in the related T. longipinnis, and absent on the head. These spots are round to oval, and of various sizes. The largest of the spots are arranged in a continuous line that starts at the gills, runs obliquely down to close to the origin of the anal fin, and then continues parallel to the anal fin to the base of the caudal fin. There is also a distinct dark line just above, and parallel to, the anal fin; this line is absent in the related T. longipinnis. The underside is whitish.
The head is approximately three-quarters as deep as long. In side view, the eyes are positioned slightly anterior to the mid-length of the head, and in top view, the eyes are closer to the outer margin of the head than they are to the body midline. There are three pairs of barbels – the down-facing maxillary and rictal barbels and the upward-facing nasal barbels. The maxillary and rictal barbels both originate at the gape of the mouth, and the former reaches up to the base of the pectoral fin. The nasal barbels reach the front margin of the eye when drawn to it. The mouth is terminal (facing forwards rather than being upturned or downturned), distinguishing the species from all other members of its family. On each side of the skull, there are 19 to 23 teeth in the dentary of the lower jaw and 20 to 22 teeth in the premaxilla of the upper jaw. The teeth are bilobed and arranged in two rows; the teeth of the inner row are smaller.
The opercles (bones that cover the gills) possess two patches of odontodes, or dermal teeth. The largest patch of odontodes is located at the end of a pronounced opercular process (protrusion). In males, it is very elongated and club-like and inspired the name of the species; this feature is not found in any other species of the family. The lateral line is short, consisting of a succession of four or five tubules that reaches from the back of the head up to the level of the rear margin of the pectoral fin. The spine invariably consists of 35 vertebrae, while T. longipinnis has 38 or 39.
Distribution and habitat
T. claviger is a local endemic of the Atlantic Forest, the second largest rainforest of the Americas, and one of the most biodiverse regions in the world. Originally, this forest covered 1.6 million hectares (4 million acres), mostly in Brazil but extending south into parts of Paraguay and Argentina. The species is known from only from the Mata de Caetés (Caetés forest), a remnant of the Atlantic Forest in Vargem Alta, Espírito Santo, Brazil. Here, the fish lives in small streams that are part of the catchment area of the Itapemirim River, which is isolated from other catchment areas. The type locality, where it was first discovered, is a small shaded stream named Picada Comprida, within primary rainforest at an altitude of around 1150 m. This forest is primary, mountainous rainforest interspersed with plantations of exotic trees. The occurrence of the species in the immediate surroundings of the site appeared to be patchy. A second locality was discovered in 2019, 4 km away from the type locality, and yet another locality was discovered by a local farmer in 2023. Together, these localities cover an area of over 16 km².
Ecology and Biology
At the type locality, the stream containing the fish is ca. 30 cm deep, slow flowing and has brown but clear water. The stream bed is sandy but partly covered with dead leaves and other organic material. The fishes are nektonic, dwelling in the middle of the water column; T. longipinnis, in contrast, is ground-dwelling. As with T. longipinnis, it is probably diurnal (active during the day). It is the only species of fish that occurs in its habitat, and it is unknown what prevents other species from entering these habitats. They feed on arthropods, as is the case with the related T. longipinnis.
Juveniles differ from adults in having larger eyes, a much shorter snout, a narrower head with a strongly sloping upper surface, and a prognathous mouth (i.e., the lower jaw is larger than the upper jaw). Such marked differences probably indicate differences in ecology between juveniles and adults. Juveniles of T. longipinnis, in contrast, are more similar adults.
The conspicuous opercular process is short in females but elongated in males, and therefore sexually dimorphic. In their species description, de Pinna and colleagues suggested that the function of this process is sexual signalling, as the process is movable and bears a black spot on its end. Visual perception appears to be important in Trichogenes species, and the related T. longipinnis has been demonstrated to rely solely on sight to detect prey. Several other neotropical freshwater fishes also have a movable black-tipped structure somewhere along the body; this feature therefore evolved independently several times.
Status, threats, and conservation
T. claviger has been classified as Critically Endangered globally by the International Union for Conservation of Nature (IUCN) since 2018. Since 2014, it is also listed as Critically Endangered in the Livro Vermelho, the Regional Red List of Brazil.
The species was discovered in 2010 on privately owned land of the Forno Grande farm that was part of a remnant forest, the Mata de Caetés. At the same site, a population of a critically endangered species of bird, the cherry-throated tanager, had already been discovered by a birdwatching party in 2003, and the site is one of only two locations where this bird still occurs. From 2011, the nonprofit organization SAVE Brasil pushed for a large public nature reserve in the Mata de Caetés. The state government approved the project in 2015 but later abandoned it due to local opposition. Instead of a public reserve, a smaller private nature reserve, the Águia Branca Private Reserve, was established in 2017 to protect 16.88 km² of the Mata de Caetés. In 2021, the Marcos Daniel Institute, supported by several nonprofits, acquired 6.67 km² of the Forno Grande farm to create a second private reserve, the Reserva Kaetés – this reserve includes the type locality of T. claviger. The entire Mata de Caetés was included in the Pedra Azul–Forno Grande ecological corridor, a priority area for conservation recognized by the state.
The Reserva Kaetés is managed by the saíra-apunhalada project, after the Portuguese common name of the cherry-throated tanager. A 2020 survey revealed negative attitudes towards the remaining forests in the local populace, and an action plan for the protection of the tanager, published in 2021, proposed to use the tanager as a flagship species to educate and involve local communities, amongst other conservation actions. As a result, locals became aware of the existence of the fish, and new localities of the species have been found within the reserve. In 2023, a farmer discovered the species at a new location outside the reserve, 5 km from the type locality, increasing the known range of the species.
References
- ^ Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) (2022). "Trichogenes claviger". IUCN Red List of Threatened Species. 2022. doi:10.2305/IUCN.UK.2022-1.RLTS.T141159992A141159997.pt. Retrieved 16 December 2024.
- ^ Pinna, Mário C. C. de; Helmer, José Luiz; Britski, Heraldo A.; Nunes, Leandro Rodrigues (2010). "A new species of Trichogenes from the rio Itapemirim drainage, southeastern Brazil, with comments on the monophyly of the genus (Siluriformes: Trichomycteridae)". Neotropical Ichthyology. 8: 707–717. doi:10.1590/S1679-62252010000400002.
- ^ Silva, Juliana Paulo; Sarmento-Soares, Luisa Maria; Tonini, Lorena; Freitas, Joelcio (2023). "The contribution of local people to species conservation: the case of the catfish Trichogenes claviger in south-east Brazil". Oryx. 57 (6): 693–693. doi:10.1017/S0030605323000893.
- Britski, H. A.; Ortega, H. (1983). "Trichogenes longipinnis, novo gênero e espécie de Trichomycterinae do sudeste do Brasil (Pisces, Siluriformes)" [Trichogenes longipinnis, a new genus and species of the Trichomycterinae from the southeast of Brazil (Pisces, Siluriformes)] (PDF). Revista Brasileira de Zoologia (in Portuguese). 1 (3): 211–216. doi:10.1590/s0101-81751982000300011.
- "Trichogenes claviger summary page". FishBase. Retrieved 18 December 2024.
- Pinna, Mário C. C. de; Reis, Vinícius (Vinícius José Carvalho); Britski, Heraldo A. (2020). "A new species of Trichogenes (Siluriformes, Trichomycteridae), with a discussion on the homologies of the anterior orbital bones in trichomycterids and other loricarioids". American Museum Novitates (3951). hdl:2246/7115.
- Marques, Marcia C. M.; Trindade, Weverton; Bohn, Amabily; Grelle, Carlos E. V. (2021). "The Atlantic Forest: An Introduction to the Megadiverse Forest of South America". In Marcia C. M. Marques, Carlos E. V. Grelle (ed.). The Atlantic Forest: History, Biodiversity, Threats and Opportunities of the Mega-diverse Forest. Cham: Springer International Publishing. p. 4. ISBN 978-3-030-55322-7.
- Livro Vermelho da Fauna Brasileira Ameaçada de Extinção - Volume I (PDF). Instituto Chico Mendes – ICMBio. 18 August 2023. ISBN 978-85-61842-79-6.
- Venturini, Ana Cristina; de Paz, Pedro Rogerio; Kirwan, Guy M. (2005). "A new locality and records of Cherry-throated Tanager Nemosia rourei in Espírito Santo, south-east Brazil, with fresh natural history data for the species" (PDF). Cotinga. 24: 60–70.
- ^ Phalan, B. T.; Magnago, G. R.; Hilty, S. (2024). Kirwan, G. M.; Keeney, B. K.; Sly, N. D. (eds.). "Cherry-throated Tanager (Nemosia rourei), version 2.0". Birds of the World Online. Cornell Lab of Ornithology, Ithaca, NY. doi:10.2173/bow.chttan1.02.
- ^ Santos, Marcelo Renan de Deus; Barbosa, Antonio Eduardo Araujo; Caetano, Valdivia Rocha Ferreira; Cordero-Schmidt, Eugenia; Fernandes, Katlin Camila; Magnago, Gustavo; Phalan, Benjamin Timothy; Rocha, Fabiana Lopes; Somenzari, Marina; Alves, Maria Alice; Amaral, Fabio; Bichinski, Tony; Bosso, Paloma; Chaves, Flávia; Cometti, Sayonara; Develey, Pedro; Hennessey, Bennett; Bruslund, Simon; Hoffmann, Diego; Jones, Carl; Lobato, Aline; Massaioli, Marcos; Mathias, Leonardo Brioschi; Nunes, Savana de Freitas; Owen, Andrew; Passamani, Jacques; Reillo, Paul; Reisfeld, Alice; Ribon, Rômulo; Rosa, Gustavo; Sampaio, Claudia; Silveira, Luis Fábio; Son, Luiz; Whitney, Bret; Phalan, Benjamin T. (2021). Workshop for the Preparation of the Action Plan and Integrated Management Strategies for the Conservation of the Cherry Throated Tanager (Nemosia rourei): Final report (PDF). Vitória, ES: Instituto Marcos Daniel. ISBN 978-65-89669-07-4.
- ^ "Cherry-throated tanager conservation case study". The Mohamed bin Zayed Species Conservation Fund. Retrieved 27 August 2024.
- Fauna & Flora International (2017). "Briefly". Oryx. 51 (4): 571–580. doi:10.1017/S0030605317001302. ISSN 0030-6053.
- Instituto Marcos Daniel (2024). "Reserva Kaetés" (PDF). Saíra News (in Portuguese). 003.
| Taxon identifiers | |
|---|---|
| Trichogenes claviger | |