Luz Eneida Ochoa

• PhD
• PostDoc Position at Museu de Zoologia Universidade de São Paulo

A new miniature tridentine catfish is described from the rio Purus drainage, Amazon basin, Brazil. It differs from all other tridentines in having several unique autapomorphies: conspicuous anteromedial protuberance in the snout; set of symphyseal premaxillary and dentary teeth inclined posteromedially; distal process of the hyomandibula directed a...

Citation: Souza CS, Mattox GMT, Vita G, Ochoa LE, Melo BF, Oliveira C (2023) Molecular species delimitation and description of a new species of Phenacogaster (Teleostei, Characidae) from the southern Amazon basin. ZooKeys 1164: 1-21. https://doi. Abstract Phenacogaster is the most species-rich genus of the subfamily Characinae with 23 valid species...

A new species of Cyphocharax is described from the Upper Paraíba do Sul River basin, São Paulo, Brazil based on integrated morphological and molecular delimitation criteria. It is morphologically distinguished from its congeners by the presence of a round, dark blotch at the midlength of the caudal peduncle not extending to the proximal portions of...

Heptapteridae is a diverse group of catfishes composed of 231 valid species endemic to the Neotropical region, recognized in two subfamilies: Rhamdiinae and Heptapterinae. Phenacorhamdia is a Heptapterinae member and currently has 13 valid species broadly distributed throughout the main river basins of South America. Here we described a new species...

Neotropical catfishes of the family Pseudopimelodidae comprise 53 species allocated to seven genera widely distributed in South America from northwestern Colombia and Venezuela to Argentina and Uruguay. Intergeneric relationships based on morphology‐based phylogenies are conflicting, and the interspecific relationships remain incipient. We conducte...

The Neotropics harbor the most species-rich freshwater fish fauna on the planet, but the timing of that exceptional diversification remains unclear. Did the Neotropics accumulate species steadily throughout their long history, or attain their remarkable diversity recently? Biologists have long debated the relative support for these museum and cradl...

Heptapteridae is composed of 228 valid species allocated in 24 genera, making it the most diverse family within superfamily Pimelodoidea, a clade endemic to the Neotropical freshwaters. Heptapterids are widely distributed from southern Mexico to the Pampas of Argentina and occupy a variety of habitats generally in small- to medium-sized rivers. To...

A new species of the bluntnose knifefish genus Brachyhypopomus Mago-Leccia is described from headwaters of upper Rio Juruena, and upper Rio Machado, Amazon basin, Brazil. The new species differs from all congeners by the absence of a small independent ossification of the Weberian complex located posterodorsally to the supraoccipital. It can be addi...

Catfishes of the family Astroblepidae form a group composed by 82 valid species of the genus Astroblepus inhabiting high-gradient streams and rivers throughout tropical portions of the Andean Cordillera. Little has been advanced in the systematics and biodiversity of astroblepids other than an unpublished thesis, a single regional multilocus study...

The Neotropical catfish genus Kronichthys contains three species distributed along coastal rivers of southern and southeastern Brazil. Although phylogenetic hypotheses are available, the molecular and morphological diversity and species boundaries within the genus remain unexplored. In this study, the authors generated mitochondrial data for 90 spe...

The Neotropical fish family Serrasalmidae comprises 16 extant genera and 101 species widespread through major Neotropical rivers with relevant importance for regional fisheries and aquaculture. The monophyly of Serrasalmidae and the recognition of three main clades are recurrent between morphological and molecular phylogenies. However, both interge...

The family Trichomycteridae is one of the most diverse groups of freshwater catfishes in South and Central America with eight subfamilies, 41 genera and more than 300 valid species. Its members are widely distributed throughout South America, reaching Costa Rica in Central America and are recognized by extraordinary anatomical specializations and t...

Accurate species delimitation is crucial for studies of phylogeny, phylogeography, ecology, conservation and biogeography. The limits of species and genera in the Characidae family are controversial due to its uncertain phylogenetic relationships, high level of morphological homoplasy and the use of ambiguous morphological characters for descriptio...

Neotropical freshwaters host more than 6000 fish species, of which 983 are suckermouth armored catfishes of the family Loricariidae – the most-diverse catfish family and fifth most species-rich vertebrate family on Earth. Given their diversity and ubiquitous distribution across many habitat types, loricariids are an excellent system in which to inv...

DNA barcoding has been used as a universal tool for delimiting species boundaries in taxonomically challenging animal groups and currently appear to be a method in systematic studies. Additionally, the growing of methods to analyze multilocus datasets in the coalescent-based framework has provided better resolution of species limits in cases of cry...

Target enrichment of conserved nuclear loci has helped reconstruct evolutionary relationships among a wide variety of species. While there are preexisting bait sets to enrich a few hundred loci across all fishes or a thousand loci from acanthomorph fishes, no bait set exists to enrich large numbers (>1000 loci) of ultraconserved nuclear loci from o...

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 absen...

The genus Astroblepus, is endemic to the Andean region and is represented by 81 valid species inhabiting high mountain rivers from Panama to Bolivia. In Colombia, about 32 species of this genus have been reported, of which 23 were recorded in the Porce River drainage, which indicates that about 71% of species diversity can be found in this area. Mo...

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. cand...

Gymnotocinclus canoeiro n. sp. of the Hypoptopomatinae is described from small tributaries of the upper rio Tocantins basin. It is distinguished from G. anosteos by having five characters: (1) the presence of body dermal plates, (2) the pectoral girdle not exposed in ventral view, (3) the pelvic spine longer than pectoral spine in males, (4) the pe...

This study presents the description of a new genus of the catfish subfamily Neoplecostominae from the Tocantins River basin. It can be distinguished from other neoplecostomine genera by the presence of (1) three hypertrophied bicuspid odontodes on the lateral portion of the body (character apparently present in mature males); (2) a large area witho...

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Cryptic species in the Neotropi-cal fish genus Curimatopsis (Teleostei, Characiformes). —Zoologica Scripta, 00, 000–000. Detritivores of the fish family Curimatidae are assigned to eight genera, one of which, the Curimatopsis, with only five species, is the least speciose genus and sister to other seven gen-era in the family. Ongoing morphological...

Detritivores of the fish family Curimatidae are assigned to eight genera, one of which, the Curimatopsis, with only five species, is the least speciose genus and sister to other seven genera in the family. Ongoing morphological investigations reveal, however, the likely existence of additional species. In this study, fifty-one specimens of Curimato...

The genus Hisonotus was resurrected as a member of the tribe Otothyrini (actually subfamily Otothyri-nae). However, phylogenetic studies based on morphological and molecular data showed that Hisonotus is not monophyletic and independent lineages can be identified, such as the group composed of the species H. insperatus, H. luteofrenatus, H. oliveir...

In the present study, we compare the results of alpha taxonomy (based on morphology), DNA Barcoding method with a 2% genetic divergence threshold, and the GMYC (General Model Yule Coalescent) technique to identify species clusters in Neoplecostomus. We used partial sequences of mitochondrial COI (Cytochrome oxidase subunit I) for 59 specimens repre...

Ichthyoplankton surveys were conducted in eight sampling sites in Ayapel Floodplain Lake during a one hydrological periods. We used a conical net with a diameter of 35 cm opening with a flowmeter installed at the mouth of the net to obtain the volume of filtered water. The larvae were grouped according to their taxonomic order and development phase...

Brachyplatystoma platynemumis a catfish species widely distributed in the Amazon basin. Despite being considered of little commercial interest, the decline in other fish populations has contributed to the increase in the catches of this species. The structure, population genetic variability, and evolutionary process that have driven the diversifica...

The present study deals with the description of a new species of Rhinolekos. It can be distinguished from its congeners by having 31 vertebrae, the anterior portion of the compound supraneural-first dorsal-fin proximal radial contacting the neural spine of the 9th vertebra, the absence of transverse dark bands in the pectoral, pelvic and anal-fin r...

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En la cuenca media del río Magdalena (Colombia) se tomaron muestras semanales durante el ciclo hidrológico 2006- 2007 para evaluar la variación espacio-temporal de las larvas de tres especies de peces migratorios (Prochilodus magdalenae Steindachner 1879, Pimelodus spp. y Pseudoplatystoma magdaleniatum Buitrago-Suarez y Burr 2007). Para este anális...

In the middle Magdalena river drainage (Colombia) samples were taken weekly during the 2006-2007 hydrological cycle to assess the spatio-temporal variation of the larvae of three species of migratory fish (Prochilodus magdalenae Steindachner 1879, Pimelodus spp. y Pseudoplatystoma magdaleniatum Buitrago-Suarez y Burr 2007). For this analysis we con...

The knowledge on the somatic development during the early life stage of Colombian fish is scarce. Some meristic characteristics such as vertebrae and myomere number are considered good tools in the taxonomic identification of fish species. However, little is known on the development of these structures, their limits during the larval stages of deve...

We presents information about Apteronotus magdalenensis relating to a new locality, habitat characteristics and a new photographic record to another specimen of this rare species not previously reported for the middle basin of the Magdalena River. The specimen is deposited in the Coleccion de Ictiologia de la Universidad de Antioquia. It is hoped...