[Ichthyology • 2018] Trichomycterus rosablanca • A New Species of Hipogean Catfish (Siluriformes, Trichomycteridae) from the Colombian Andes

Trichomycterus rosablanca 

Mesa S., Lasso, Ochoa & DoNascimiento, 2018

DOI:  10.21068/c2018.v19s1a09 

Abstract

Trichomycterus rosablanca is described as a new troglobitic catfish species from caves in southeastern Santander, Colombia. These caves are drained by the Carare River of the Magdalena River basin. The new species is characterized by the advanced condition in the typical troglomorphisms found in other congeneric cave-dwelling species, such as absence of eyes and pigmentation. Trichomycterus rosablanca is diagnosed by the following putative autapomorphies: 1) presence of a circular foramen in the main body of the interopercle, dorsal to the interopercular plate supporting the odontodes, and 2) presence of a single sensory pore in the posteriormost section of the infraorbital canal. Trichomycterus rosablanca can be distinguished from all known Trichomycterus species from Colombia by having the supraorbital canal interrupted in the nasal section, resulting in the pattern of s1, s2, s3, and s6 sensory pores, and the lachrimal/antorbital bone not enclosing the anteriormost section of the infraorbital canal. The genetic distinctiveness of Trichomycterus rosablanca is confirmed by GMYC and genetic distance method analyses of the cytochrome C oxidase subunit I gene sequence. The description of this species places Colombia as the second most diverse country in the continent in terms of number of cave fish species and calls the attention on the conservation efforts needed to guarantee the permanence of this remarkable diversity of hypogean fishes.

Keywords: Cave fish. Karstic. Middle Magdalena River basin. Santander.

Figure 7. Live specimens of Trichomycterus rosablanca

 (left picture corresponds to one specimen coming from IAvH-P 15811 lot of paratypes). 

Photographs by Felipe Villegas.

Trichomycterus rosablanca, new species

Etymology. The specific name is used as a noun in apposition in reference to the Rosablanca karstic formation where the type locality is found.

Lina M. Mesa S., Carlos A. Lasso, Luz E. Ochoa and Carlos DoNascimiento. 2018. Trichomycterus rosablanca (Siluriformes, Trichomycteridae) A New Species of Hipogean Catfish from the Colombian Andes [Trichomycterus rosablanca (Siluriformes, Trichomycteridae) una especie nueva de bagre hipogeo de los Andes colombianos]. Biota Colombiana. 19 (Sup. 1); 95-116. DOI:  10.21068/c2018.v19s1a09

ResearchGate.net/publication/325995979_Trichomycterus_rosablanca_Siluriformes_Trichomycteridae_a_new_species_of_hipogean_catfish_from_the_Colombian_Andes

 twitter.com/halooie1/status/1022936445005312001

Resumen: Se describe Trichomycterus rosablanca, una especie nueva de bagre troglobio de cuevas en el suroriente de Santander, Colombia. Estas cuevas son drenadas por el río Carare, de la cuenca del río Magdalena. La especie nueva se caracteriza por la condición avanzada en los troglomorfismos típicos encontrados en otros congéneres habitantes de cuevas, como ausencia de ojos y pigmentación. Trichomycterus rosablancaes diagnosticado por las siguientes autapomorfías putativas: 1) presencia de un foramen circular en el cuerpo principal del interopérculo, dorsal a la placa interopercular soportando los odontodes, y 2) presencia de un único poro sensorial en la sección más posterior del canal infraorbital. Trichomycterus rosablanca puede ser distinguida de todas las especies conocidas de Trichomycterus de Colombia por tener el canal supraorbital interrumpido en la sección nasal, resultando en el patrón de poros sensoriales s1, s2, s3 y s6 y el hueso lacrimal/antorbital no encerrando la sección más anterior del canal infraorbital. La identidad genética de Trichomycterus rosablanca es confirmada por análisis GMYC y de distancia genética de la secuencia génica de la subunidad I de la citocromo C oxidasa. La descripción de esta especie ubica a Colombia como el segundo país más diverso en el continente en términos del número de especies de peces cavernícolas y llama la atención sobre los esfuerzos de conservación necesarios para garantizar la permanencia de esta extraordinaria diversidad de peces hipogeos. 

Palabras clave: Cárstico. Cuenca media del río Magdalena. Pez cavernícola. Santander.

[Ichthyology • 2017] Trichomycterus pascuali • A New Species of Trichomycterus (Siluriformes: Trichomycteridae) Lacking Pelvic Fins from Paranapanema Basin, southeastern Brazil

Trichomycterus pascuali

Ochoa, Silva, Silva, Oliveira & Datovo, 2017

 DOI:  10.11646/zootaxa.4319.3.7 

Abstract

A new species of trichomycterid catfish, Trichomycterus pascuali, is described from Paranapanema basin and is distinguished from all congeners by the possession of five pectoral-fin rays and the absence of pelvic fin, girdle, and muscles. Additional features further differentiate the new species from the other congeners lacking pelvic fins, T. candidus, T. catamarcensis, and T. tropeiro. The identification of T. pascuali is additionally corroborated by genetic divergence based on DNA-barcode analysis. Osteological and myological data unequivocally support the inclusion of the new species in the Trichomycterinae and molecular analyses justify its allocation to the genus Trichomycterus rather than Eremophilus, a trichomycterine taxon traditionally diagnosed by the lack of pelvic fins. Our genetic analysis further indicates that pelvic fins were independently lost in E. mutisii, T. candidus, and T. pascuali.

Keywords: Pisces, Upper Paraná Basin, Freshwater catfish, pelvic-fin loss, taxonomy

FIGURE 2. Body coloration patterns observed in Trichomycterus pascuali, LBP 23323, (A) 45.4 mm SL, (B) 52.2 mm SL. 

Luz E. Ochoa, Gabriel S. C. Silva, Guilherme J. Costa E. Silva, Claudio Oliveira and Alessio Datovo. 2017. New Species of Trichomycterus (Siluriformes: Trichomycteridae) Lacking Pelvic Fins from Paranapanema Basin, southeastern Brazil.   Zootaxa. 4319(3); 550–560. DOI:  10.11646/zootaxa.4319.3.7

[Ichthyology • 2017] Trichomycterus ytororo • Living in the Waterfalls: A New Species of Trichomycterus (Siluriformes: Trichomycteridae) from Tabay Stream, Misiones, Argentina

Trichomycterus ytororo

Terán, Ferrer, Benitez, Alonso, Aguilera & Mirande, 2017

live specimens (A). holotype CI–FML 7241, 94.2 mm. (B–D). paratype CI–FML 7241, 60.9 mm SL.
Argentina, Misiones, Jardín América, Tabay stream, Paraná River basin. 

   DOI: 10.1371/journal.pone.0179594

Abstract

A new species assigned to the genus Trichomycterus from the area of the waterfalls of Tabay stream, Paraná River basin, Misiones, Argentina, is described. Trichomycterus ytororo sp. nov. is distinguished from all other species in the genus by the presence of 31–35 dorsal procurrent caudal-fin rays and the combination of some external characters such as: coloration, number of pectoral–fin rays and pores of the laterosensory canals. The new taxon belongs to a presumably monophyletic group of species composed of T. crassicaudatus, T. igobi, and T. stawiarski based on the presence of 24 or more thickly ossified and rigid procurrent caudal-fin rays with a slender distal tip extending along the tips of at least ten neural spines.

Fig 4. Geographic distribution of the species assigned to the Trichomycterus stawiarski group: T. crassicaudatus (green symbols), T. igobi (white symbols), T. stawiarski (yellow symbols) and T. ytororo (red symbol). Stars represent the type localities. Some triangles symbols represent more than one collection locality. Numbers 1, 2, 3 indicate the Paraguay, Paraná and Iguazú Rivers, respectively.

Fig 5. Type locality of Trichomycterus ytororo; Tabay waterfalls, Tabay stream, Jardín América, Misiones, Argentina.

Ecological notes: The Tabay stream basin through 192 km from its headwaters at Campo Viera to its mouth on the Paraná River, at Jardín América (Fig 4). The stream bed is mainly composed of basaltic bedrock, in which sections with waterfalls and pools alternates all along its run. At the type locality (Tabay waterfall; Fig 5), the stream is surrounded by remnants of the Paranaense riparian forest, with its left margin degraded due to a camping site. This waterfall consists of three consecutive falls, the main one is 10m high and 20–50m wide, which drains into a narrow gorge. All specimens of Trichomycterus ytororo were captured above the waterfalls at shallow areas (about 1 meter depth or less) or in rapids witha predominantly rocky bottom and strong current. Trichomycterus davisi was the single congener recorded at the type locality, which was not collected syntopically with T. ytororo.

 Distribution: Trichomycterus ytororo is so far known only from its type locality, the Tabay waterfalls in the Tabay stream (Fig 5), a tributary of the left bank of the Paraná River, province of Misiones, northeast of Argentina (Fig 4).

Etymology: The specific epithet ytororo derived from the indigenous language Guaraní (“ytororõ”) which means “waterfall” in reference to the habitat occupied by the new species. A noun in apposition.

Guillermo Enrique Terán, Juliano Ferrer, Mauricio Benitez, Felipe Alonso, Gastón Aguilera and Juan Marcos Mirande. 2017. Living in the Waterfalls: A New Species of Trichomycterus (Siluriformes: Trichomycteridae) from Tabay Stream, Misiones, Argentina.
 PLoS ONE. 12(6); e0179594.  DOI: 10.1371/journal.pone.0179594

[Ichthyology • 2016] Trichomycterus giarettai • A New Species of the Catfish Genus Trichomycterus (Siluriformes: Trichomycteridae) from the Paranaíba Basin, Central Brazil

Trichomycterus giarettai 

 Barbosa & Katz, 2016 

Abstract

Trichomycterus giarettai, new species, from a small river in Cumari municipality, Central Brazil is described. It is hypothesized to be closely related to species of T. brasiliensis complex by possessing the opercular odontodes disposed obliquely on the patch. Trichomycterus giarettai is diagnosed by the distribution of infraorbital pores, body width, caudal peduncle width, number of vertebrae, branchiostegal rays, dorsal and ventral procurrent rays, opercular and interopercular odontodes, length of the nasal barbels, and pelvic fin insertion.

Key words: Catfishes, Goiás, Neotropical, Trichomycterinae, systematics, taxonomy.

Fig. 1. Trichomycterus giarettai, UFRJ 10109, preserved holotype, 69.4 mm SL; Brazil: Goiás: Município de Cumari.

 Photo by A.M.Katz.  

Distribution. Known only from a small stream, tributary of the upper rio Paranaíba basin, Central Brazil.

Etymology. The name “giarettai” was given in honor to the herpetologist A. Giaretta, that first collected the new species in the field. 

M. A. Barbosa and A. M. Katz. 2016. A New Species of the Catfish Genus Trichomycterus (Teleostei: Siluriformes: Trichomycteridae) from the Paranaíba Basin, Central Brazil. Vertebrate Zoology. 66(3); 261-265. 

http://www.senckenberg.de/files/content/forschung/publikationen/vertebratezoology/vz66-3/03_vertebrate_zoology_66-3_barbosa_261-265.pdf

Resumo: Trichomycterus giarettai, espécie nova, de um pequeno riacho no município de Cumari, Brasil Central, é descrito. Ele é hipotetizado como proximamente relacionado as espécies do complexo T. brasiliensis por possuir a distribuição diagonal dos odontódeos na placa opercular. Trichomycterus giarettai é diagnosticado pela distribuição dos poros infraorbitais, largura do corpo, largura do pedúnculo caudal, número de vértebras, raios branquiostegais, raios procorrentes ventrais e dorsais,odontódeos operculares e interoperculares, comprimento dos barbilhões nasais e inserção da nadadeira pélvica.

[Ichthyology • 2011] Stenolicmus ix • A New Species of Sand-dwelling Catfish of the genus Stenolicmus (Siluriformes; Trichomycteridae) from Igarapé Curuá, left tributary of the Rio Amazonas, Pará, Brazil

Stenolicmus ix 

Wosiacki, Coutinho & de Assis Montag, 2011 

Abstract

Stenolicmus ix, new species, is described from Igarapé Curuá, left tributary of the Rio Amazonas, Pará, Brazil. It can be distinguished from S. sarmientoi by the length of the nasal barbels that reach the base of the first opercular odontodes; length of the maxillary barbels that reach the posterior margin of the opercular odontode plate; seven well-developed opercular odontodes; seven well-developed interopercular odontodes; color pattern of the dorsal region of trunk composed of agglomerated chromatophores forming circular patches twice the diameter of the eye; proportionally large eyes, 11.8% HL; caudal peduncle tall, 11.6% SL, without dark bar at base of the caudal fin; length of the head proportionately larger, 17.9% SL; unbranched rays of caudal fin reaching distal margin of fin. Comparisons with other Sarcoglanidinae and Trichomycteridae are presented. Some comments on the systematics and phylogenetic relationships of the group are made.

Keywords: New catfish; Sarcoglanidinae; lower Amazon basin

Wolmar Benjamin Wosiacki, Daniel Pires Coutinho and Luciano Fogaça de Assis Montag. 2011. Description of A New Species of Sand-dwelling Catfish of the genus Stenolicmus (Siluriformes; Trichomycteridae). Zootaxa.

http://www.mapress.com/j/zt/article/view/10401

ResearchGate.net/publication/287789903_Description_of_a_new_species_of_sand-dwelling_catfish_of_the_genus_Stenolicmus

Jaguar-like species of catfish discovered in the Amazon

http://phys.org/news/2011-03-jaguar-like-species-catfish-amazon.html

http://www.cienciahoje.org.br/noticia/v/ler/id/1503/n/mais_uma_da_calha_norte

[Ichthyology • 2014] Ituglanis boticario • A New Troglomorphic Catfish (Siluriformes: Trichomycteridae) from Mambaí Karst Area, central Brazil

Ituglanis boticario Rizzato & Bichuette, 2014
Figures 2-6. Ituglanis boticario, new species, holotype (LIRP-11010B, 69,7 mm SL).
Brazil: Goiás state, Mambaí municipality, Tarimba cave system; Mambaí karst area, upper Tocantins River Basin. Left lateral (2), dorsal (3) and ventral (4) views of body, and dorsal (5) and ventral (6) views of head.  Scale bars: 2-4 = 10 mm, 5-6 = 5.0 mm. 

DOI: 10.1590/S1984-46702014000600006

ABSTRACT

 A new subterranean and troglomorphic species of Ituglanis Costa and Bockmann, 1993 is described from the carbonatic karst area of northeastern Goiás state, upper Tocantins River Basin, central Brazil, representing the sixth subterranean species of the genus described from the same region. Ituglanis boticario sp. nov. is diagnosed by a combination of unusual characters for the genus: body pigmentation forming longitudinal stripes, 7-8 pairs of ribs, presence of the anterior segment of the infraorbital laterosensory canal, and usually 8 pectoral-fin rays. Due to the absence of epigean populations and the presence of some degree of morphological specialization to the subterranean environment, it can be classified as a troglobite (i.e., exclusively subterranean). The description of this species increases the importance of the northeastern Goiás region as a biodiversity spot for subterranean ichthyofauna, mainly Ituglanis. The region demands urgent political efforts to ensure the preservation of its speleobiological patrimony, including the Tarimba cave system, one of the largest caves in Brazil and type-locality of I. boticario sp. nov.

KEY WORDS: Cave fauna; taxonomy; troglobite; upper Tocantins River Basin.

Figure 1. Northeastern Goiás State, with main rivers (blue lines), municipalities (black dots), and localities of occurrence of the subterranean Ituglanis species (red dots). Only the rivers from the eastern margin of Paranã river are shown. Gray areas represent the Bambuí geomorphologic formations. Rivers highlighted in dark blue are related to the localities of occurrence of the subterranean species, and the dotted portions represent the subterranean traject of these rivers.

DOI: 10.1590/S1984-46702014000600006

Distribution. Ituglanis boticario sp. nov. is known only from subterranean streams on the Mambaí karst area, belonging to the Rio Vermelho sub-basin, a tributary of Rio Paranã, upper Tocantins River Basin, on the northeastern region of Goiás state. Its presence was reported for at least two cave systems on the Mambaí municipality region (from north to south): the Tarimba cave system and the Nova Esperança cave system. 

Etymology. The specific epithet – boticario – is in honor of Fundação O Boticário de Proteção à Natureza (FBPN) which financially supported a project for effective protection of Tarimba cave system, including the proposition of a Conservation Unit at Goiás State. A noun in apposition.

Pedro Pereira Rizzato and Maria Elina Bichuette. 2014. Ituglanis boticario, A New Troglomorphic Catfish (Teleostei: Siluriformes: Trichomycteridae) from Mambaí Karst Area, central Brazil. ZOOLOGIA. 31 (6): 577–598, December, 2014
DOI: 10.1590/S1984-46702014000600006

http://www.scielo.br/pdf/zool/v31n6/06.pdf

[Ichthyology • 2014] Ituglanis australis • A New Species of Ituglanis (Siluriformes: Trichomycteridae) Representing the southernmost Record of The Genus, with Comments on Phylogenetic Relationships

Ituglanis australis Datovo & de Pinna, 2014

DOI: 10.1111/jfb.12285

ABSTRACT

Ituglanis australis new species, is described from tributaries of the Laguna dos Patos and Río Uruguay, in Brazil and Uruguay. This represents the southernmost record of the genus and the first occurrence of a species of Ituglanis in those systems. It is distinguished from all its congeners, except Ituglanis parahybae and Ituglanis cahyensis, by its body pigmentation with three well-defined dark brown stripes running along each flank. Ituglanis australis differs from I. parahybae and I. cahyensis in the pectoral- and pelvic-fin ray counts, the pattern of the cephalic laterosensory system and the number of dorsal-fin basal radials. The new species, as well as several other examined congeners, has the levator internus IV muscle attached to the dorsal face of the posttemporo-supracleithrum; a condition that corroborates the inclusion of Ituglanis into a large trichomycterine clade that also includes Bullockia, Hatcheria, Scleronema and several species of Trichomycterus. Previous proposals of the affinities within Ituglanis are reviewed and, despite some advances, the phylogenetic relationships among species of the genus remain largely unknown.

Keywords: catfish; Loricarioidea; musculature; phylogeny; systematics; taxonomy

 Datovo, A. & de Pinna, M.C.C. 2014. A New Species of Ituglanis Representing the southernmost Record of The Genus, with Comments on Phylogenetic Relationships (Teleostei: Siluriformes: Trichomycteridae). Journal of Fish Biology. 84 (2): 314–327. DOI: dx.doi.org/10.1111/jfb.12285

 researchgate.net/publication/259845752_A_new_species_of_Ituglanis_representing_the_southernmost_record_of_the_genus_with_comments_on_phylogenetic_relationships_(Teleostei_Siluriformes_Trichomycteridae)

[Ichthyology • 2014] Ituglanis apteryx • A New Species of Ituglanis from the Rio Xingu basin, Brazil, and the Evolution of Pelvic Fin Loss in Trichomycterid Catfishes (Siluriformes: Trichomycteridae)

Ituglanis apteryx Datovo, 2014

DOI: 10.11646/zootaxa.3790.3.5

ABSTRACT 

A new species of the trichomycterid catfish genus Ituglanis is described from the Rio Curuá, Rio Xingu basin, Rio Amazonas drainage, Brazil. Ituglanis apteryx, new species, is promptly distinguished from congeners, except some specimens of I. parahybae (Eigenmann), by the absence of pelvic fins, girdle, and muscles. The new species differs from I. parahybae in the pattern of the cephalic laterosensory system; the absence of a posterior cranial fontanel; the presence of an epural; and the number of branchiostegal rays, ribs, and vertebrae. Ituglanis apteryx is one among the several trichomycterids lacking pelvic fins. Analysis reveals that pelvic fin loss independently evolved several times during the trichomycterid radiation.

Keywords: Loricarioidea, catfish, taxonomy, systematics, phylogeny, musculature

 Alessio Datovo. 2014. A New Species of Ituglanis from the Rio Xingu basin, Brazil, and the Evolution of Pelvic Fin Loss in Trichomycterid Catfishes (Teleostei: Siluriformes: Trichomycteridae).  Zootaxa. 3790(3):466-476.

DOI: 10.11646/zootaxa.3790.3.5

researchgate.net/publication/261759653_A_new_species_of_Ituglanis_from_the_Rio_Xingu_basin_Brazil_and_the_evolution_of_pelvic_fin_loss_in_trichomycterid_catfishes_(Teleostei_Siluriformes_Trichomycteridae)