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A new species of Hyphessobrycon Durbin is described from tributaries of the rio Grande (rio São Francisco basin) draining east to the Serra Geral de Goiás, of the rio São Domingos (upper rio Tocantins basin) and rio do Sono basins (middle rio Tocantins basin). Hyphessobrycon diastatos can be diagnosed from its congeners by the absence of humeral sp...
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... on the basis mainly of a reduced muscle layer between the first and second ribs, the absence of humeral spot, and the sexually dimorphic caudal spot. Males of the aforementioned species have a poorly-defined caudal- peduncle, formed by pigmentation spread over inner portions of the caudal lobes (especially in H. negodagua and H. parvellus, Fig. 7). Respective females have a round and relatively well-defined caudal-peduncle blotch, not extending to the caudal-fin lobes. Hyphessobrycon diastatos shares these characters, except that its caudal-peduncle blotch is round, relatively well-defined, and does not extend to the caudal-fin lobes in either sex. Whether those species compose ...
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Citations
... quelen), the occurrence of some species may be due to the natural connection between these basins. Among the species that occur in the upper Tocantins and middle São Francisco River basins are Astyanax novae, Cichlasoma sanctifranciscense, Eigenmannia besouro, Hyphessobrycon diastatos Dagosta, Marinho & Camelier 2014 and Pristella crinogi Lima, Caires, Conde-Saldaña, Mirande & Carvalho 2021 (Garutti & Venere 2009, Lima & Caires 2011, Dagosta et al. 2014, Birindelli et al. 2015, Lima et al. 2021. Lima & Caires (2011) and Dagosta et al. (2014) discussed the connections between the headwaters of the three drainages and the possible routes for the exchange of freshwater organisms, including those between the Novo River (Tocantins basin) and the Sapão river (São Francisco River basin), and between the São Domingos River (Tocantins basin) and the Grande River (São Francisco River basin). ...
... quelen), the occurrence of some species may be due to the natural connection between these basins. Among the species that occur in the upper Tocantins and middle São Francisco River basins are Astyanax novae, Cichlasoma sanctifranciscense, Eigenmannia besouro, Hyphessobrycon diastatos Dagosta, Marinho & Camelier 2014 and Pristella crinogi Lima, Caires, Conde-Saldaña, Mirande & Carvalho 2021 (Garutti & Venere 2009, Lima & Caires 2011, Dagosta et al. 2014, Birindelli et al. 2015, Lima et al. 2021. Lima & Caires (2011) and Dagosta et al. (2014) discussed the connections between the headwaters of the three drainages and the possible routes for the exchange of freshwater organisms, including those between the Novo River (Tocantins basin) and the Sapão river (São Francisco River basin), and between the São Domingos River (Tocantins basin) and the Grande River (São Francisco River basin). ...
... Among the species that occur in the upper Tocantins and middle São Francisco River basins are Astyanax novae, Cichlasoma sanctifranciscense, Eigenmannia besouro, Hyphessobrycon diastatos Dagosta, Marinho & Camelier 2014 and Pristella crinogi Lima, Caires, Conde-Saldaña, Mirande & Carvalho 2021 (Garutti & Venere 2009, Lima & Caires 2011, Dagosta et al. 2014, Birindelli et al. 2015, Lima et al. 2021. Lima & Caires (2011) and Dagosta et al. (2014) discussed the connections between the headwaters of the three drainages and the possible routes for the exchange of freshwater organisms, including those between the Novo River (Tocantins basin) and the Sapão river (São Francisco River basin), and between the São Domingos River (Tocantins basin) and the Grande River (São Francisco River basin). Since this is a region with unique hydrographic aspects (preserved 'veredas', clear water rivers used for tourism, and shared headwaters between drainages) and inhabited by many possibly undescribed species, we suggest that additional studies be carried out in the region to assess the possibility of expanding the NPNP encompassing portions of the Sapão River, thereby also protecting part of the fish fauna from the headwaters of the middle São Francisco River drainage. ...
The Nascentes do Rio Parnaíba National Park (NPNP), located in Brazilian Cerrado, protects portions of three river basins: headwaters of Parnaíba, a small portion in upper Tocantins-Araguaia, and tributaries of the middle section of the São Francisco. This protected area is in the boundaries of the states of Maranhão, Tocantins, Piauí, and Bahia, also known as MATOPIBA, a region that has established rapid agricultural expansion associated to land conflicts between corporate agriculture, family agriculture, protected areas, indigenous territories, and quilombola communities. The knowledge of the ichthyofauna in this region is scarce while the impacts on the aquatic environments are increasing. We made a survey of fishes in the NPNP and its surroundings areas, estimating richness, endemics, introduced and shared species between river basins. During 2014, 54 sampling sites were visited, 19 in the NPNP and 35 in the surrounding area. Ninety-five species, 51 genera, 22 families, and six orders were recorded, of which 38 (40%) are in the NPNP. One introduced species were recorded in the Parnaíba River basin and no endangered species were registered. Our data corroborate the importance of the network of protected areas for the preservation of Cerrado fishes, including some possibly undescribed and restricted-range species that may be threatened due to intense agricultural encroachment in the MATOPIBA region.
... Color version online. Dagosta et al. 2014). As discussed by Lima and Caires (2011), both basins are connected through the common headwater shared between the rio Novo (rio Tocantins basin) and the rio Sapão (rio São Francisco basin), but only the relatively few fish species occurring at this headwater area can effectively move from one basin into the other. ...
A new species of the genus Pristella Eigenmann, 1908 (Pristella crinogi sp. nov.) is described from the middle rio Tocantins and middle rio São Francisco basins, Brazil. The new species can be diagnosed from its two congeners, Pristella ariporo Conde-Saldaña, Albornoz-Garzón, García-Melo, Villa-Navarro, Mirande, and Lima, 2019 and Pristella maxillaris (Ulrey, 1894), by a combination of color pattern and teeth morphology characters. A phylogenetic analysis of the genus recovered P. crinogi as the sister taxa of P. ariporo. Pristella crinogi, along with P. ariporo, are the first characiform fishes, and one of the first bony fishes, to be reported as presenting a reversed sexual dimorphism, with females presenting a more developed color pattern than males. Comments on the miniaturization of the species, as well as remarks on the biogeography of the genus Pristella, are presented. Résumé : Une nouvelle espèce de genre Pristella Eigenmann, 1908 (Pristella crinogi sp. nov.) est décrite des bassins versants du rio Tocantins moyen et du rio São Francisco moyen (Brésil). La nouvelle espèce se distingue de ses deux congénères, Pris-tella ariporo Conde-Saldaña, Albornoz-Garzón, García-Melo, Villa-Navarro, Mirande et Lima, 2019 et Pristella maxillaris (Ulrey, 1894), par une combinaison de caractères associés à la coloration et à la morphologie des dents. Une analyse phylogénétique du genre fait ressortir P. crinogi comme taxon-frère de P. ariporo. Pristella crinogi, ainsi que P. ariporo sont les premiers pois-sons characiformes et parmi les premiers poissons osseux pour lesquels un dimorphisme sexuel inversé est signalé, les femelles présentant une coloration plus développée que les mâles. Des commentaires sur la miniaturisation des espèces, ainsi que des remarques sur la biogéographie du genre Pristella sont présentés. [Traduit par la Rédaction]
... Even though mating behaviour has not yet been studied in Barton, & Szymura, 1998;Vines, 2002). The sexual dimorphism found in Nematocharax, including the presence of hooks and spinules on fins and elongated fins in maturing and mature males, is also commonly reported in small characid species (Dagosta, Marinho, & Camelier, 2014;Marinho, Dagosta, & Birindelli, 2014;Zanata & Camelier, 2009) being usually related to male display behaviour and female mate choice (Bischoff, Gould, & Rubenstein, 1985). Further investigation can directly test whether assortative mating of hybrids contributes to reproductive isolation from the parental lineages. ...
Understanding the structure of hybrid zones provides valuable insights about species boundaries and speciation, such as the evolution of barriers to gene flow and the strength of selection. In river networks, studying evolutionary processes in hybrid zones can be especially challenging, given the influence of past and current river properties along with biological species‐specific traits. Here, we suggest that a natural hybrid zone between two divergent lineages of the sexually dimorphic Neotropical fish Nematocharax venustus was probably established by secondary contact as a result of a river capture event between the Contas and Pardo river basins. This putative river capture is supported by hydrogeological evidence of elbows of capture, wind gaps, and geological faults. The morphological (color pattern) and genetic (mtDNA and RADseq) variation reveal a clinal transition between parental lineages along the main river, with predominance of F2 hybrids at the centre of the hybrid zone, absence of early generation backcrosses, and different levels of hybridization in the tributaries. We highlight that different sources of information are crucial for understanding how the riverscape spatial history influences the connectivity between and within rivers systems and, consequently, the dynamics of gene flow between freshwater lineages/species.
... Among fishes, sexual selection is responsible for the evolution of impressive morphological novelties. Specifically in the Characiformes, secondary sexual dimorphism is commonly associated to the occurrence of bony hooks on fins, breeding tubercles, gill glands, modified scales [2][3][4][5][6][7][8][9][10], shape and length of the dorsal, pelvic and anal fins [11][12][13][14][15][16][17][18][19][20][21], and sexual dichromatism [22,23]. ...
Among the order Characiformes, secondary sexual dimorphism is commonly associated to the occurrence of bony hooks on fins, shape and length of the dorsal and anal fins, and sexual dichromatism. The analysis of a new miniature Characidae species of the genus Tytto-brycon, described herein, yielded to the discovery of a sexually dimorphic trait related to nostril aperture and number of olfactory lamellae. In this type of dimorphism, mature males present larger nostril aperture and higher number of olfactory lamella than females. A dimor-phic olfactory organ is for the first time recorded and described for a member of the Characi-formes. Gross morphology and development of brain and peripheral olfactory organ of Tyttobrycon sp. n. are described and compared to other species of Characidae. It is hypothesized that such dimorphic trait is related to male-male detection during cohort competition in small characids. The new species of Tyttobrycon is diagnosed from its congeners by the number of branched anal-fin rays (19-21) and the absence of a caudal-peduncle blotch. It occurs in a small tributary of Rio Madeira basin, near to the limit between Brazil and Bolivia, Acre State, Brazil.
... Most represented genera with new species are Astyanax with eight new species, Characidium with four, Hypostomus with three, along with the new monotypic genus Hirtella Pereira et al. Nationwide ichthyologists also took advantage of the results of the last decade samplings, with use of the MZUFBA's fish collection in various publications (e.g., Dagosta et al., 2014;Barreto et al., 2016;Jerep et al., 2016;Rossini et al., 2016). Also, a comprehensive biogeographical study based mainly on that collection was performed by Camelier & Zanata (2014). ...
The Zoological Collection of the Museu de Zoologia of the Universidade
Federal da Bahia (MZUFBA), located in the municipality of Salvador, Bahia, Northeastern
Brazil, began in 1940, with the incorporation of the butterflies’ collection belonging to Dr. Pedro de Araújo (Hamdan et al., 2013). At that time, the collection was housed in the former Faculdade de Filosofia, Ciências e Letras da Universidade Federal da Bahia (UFBA) being posteriorly moved to the Instituto de Biologia of UFBA (IBio), where it stands up to date. Nowadays, it houses about 141,000 specimens catalogued and about 150,000 yet to be included in the MZUFBA’s database.
... Most represented genera with new species are Astyanax with eight new species, Characidium with four, Hypostomus with three, along with the new monotypic genus Hirtella Pereira et al. Nationwide ichthyologists also took advantage of the results of the last decade samplings, with use of the MZUFBA's fish collection in various publications (e.g., Dagosta et al., 2014;Barreto et al., 2016;Jerep et al., 2016;Rossini et al., 2016). Also, a comprehensive biogeographical study based mainly on that collection was performed by Camelier & Zanata (2014). ...
This edition in which the article is included counts with articles about 22 Brazilian fish collections and 17 other collections distributed around the world. Despite the different localities, one thing all articles have in common: our investment in sampling the neotropical fish biodiversity and an urge to discuss the slow (or rapid) dismounting of scientific collections, due to limited investment to their maintenance and care. Our former SBI President, Luiz Malabarba opens this bulletin with an article that questions the “chronicles of a death foretold” of museums and scientific collections, urging us to review our values regarding scientific and cultural patrimony.
... Most represented genera with new species are Astyanax with eight new species, Characidium with four, Hypostomus with three, along with the new monotypic genus Hirtella Pereira et al. Nationwide ichthyologists also took advantage of the results of the last decade samplings, with use of the MZUFBA's fish collection in various publications (e.g., Dagosta et al., 2014;Barreto et al., 2016;Jerep et al., 2016;Rossini et al., 2016). Also, a comprehensive biogeographical study based mainly on that collection was performed by Camelier & Zanata (2014). ...
... Thus, Eigenmann (1909) is clearly the first author to propose a reticulated history to the Amazonian fishes, a hypothesis which has been repeatedly corroborated in recent works and is one of the prevailing paradigms in the biogeography of the basin (cf. Hubert, Renno, 2006;Ribeiro, 2006;Dagosta et al., 2014;Dagosta, de Pinna, 2017). Haseman (1912) criticizes most of the proposals by Eigenmann (1909), arguing that the large quantity of taxa in a given region does not imply that it is the center of origin and dispersal of that group. ...
The history of knowledge about Amazonian biogeography is as rich as its fish community, and a fascinating theme of study in itself. Several current paradigms and controversies about Amazonian fish biogeography are rooted in principles dating from the second half of the 18th to the first half of the 19th centuries. The present work establishes a relationship between current biogeographical ideas and their old predecessors, on the basis of a chronologically-oriented historical continuity analysis. The advent of evolutionary theory has not contributed significantly to a transformation of the knowledge on the biogeography of Amazonian fishes. On the other hand, the two main schools of biogeographical thought (dispersalist and vicariant) had major implications on how Amazonian fish distribution is interpreted. The process was gradual and many hypotheses have combined elements from each of the two schools. Chronologically, practically the entire tradition of Amazonian biogeography takes place within the evolutionary paradigm, although its founder Louis Agassiz was himself an anti-evolutionist. The birth of Amazonian biogeography is Agassiz´s travel in Amazon. That document makes it clear that the author did not consider dispersal as a valid explanation for the biogeographical patterns he found. Later, Carl Eigenmann helps to spread the dispersalist tradition as a model for biogeographical explanations in fish distributions, a phase which lasted until the late 20th century. A major shift occurs with the contributions of Marylin Weitzman, Stanley Weitzman and Richard Vari, who associated the temporal framework of phylogenetic hypotheses with distribution patterns, underscoring the predictive power of vicariant biogeography. The present-day paradigm begins with the work of John Lundberg and attempts to incorporate geomorphological and phylogenetic information into integrative biogeographical hypotheses. Some emblematic problems have delayed proposition of general hypotheses on the phylogenetic biogeography of South American fishes, such as the poor state of knowledge of their species-level systematics; an incomplete distributional record for most species and sparse or non-existent data on the phylogenetic history of most supraspecific taxa. Such drawbacks are now being corrected at a fast pace. Recent advances on geographical distribution and an increasing number of phylogenetic hypotheses will allow unprecedented large-scale biogeographic analyses, including those based on event models and Bayesian inference. Thus, the biogeography of South American fishes, especially Amazonian ones, should soon experiment a new age of progress. The success of that new phase will depend on its ability to recognize and segregate multiple overlapping temporal layers of hydrological changes, and to develop analytical tools that can deal with temporal mixing.
... The species H. diastatos was recently described (Dagosta et al., 2014), with its occurrence for the São Francisco River basin recorded only in the Grande River sub-basin, but this species also occurs in the middle and high Tocantins River basin. The distribution of this species must be associated with places at high altitudes, clear waters and fast velocity (Dagosta et al., 2014). ...
... The species H. diastatos was recently described (Dagosta et al., 2014), with its occurrence for the São Francisco River basin recorded only in the Grande River sub-basin, but this species also occurs in the middle and high Tocantins River basin. The distribution of this species must be associated with places at high altitudes, clear waters and fast velocity (Dagosta et al., 2014). H. vespuccii belong to the family Loricariidae. ...
We studied the leading causes of the spatial distribution pattern of fish species assemblage in the transition region between Cerrado-Caatinga biomes, in the São Francisco River (Brazil). Biotic and abiotic variables were collected at 17 sampling sites located in three sub-basins, in two periods during 2015. Some 1689 individual fish were sampled, distributed in 69 species, 51 genera, 22 families and seven orders. There was a low overlap of species, with only seven species in common among the three sub-basins. The most substantial degree of sharing occurred between sub-basins from the Cerrado biome, with 22 restricted species. Crenicichla lepidota, Psellogrammus kennedyi, and Hoplosternum littorale were associated with the sub-basin from Caatinga, and Astyanax aff. eigenmanniorum and Bryconops aff. affinis with Cerrado sub-basins. The fish assemblage showed significant spatial variation between biomes, and the distribution was determined by an interaction of regional altitude variable with local variables such as river width, substrate and water velocity (environmental factors), but geographical factors were also important. Fish assemblage difference along a large river course has significant implications for conservation strategies, management or evaluation of biodiversity, needing several strategies for their preservation considering small geographic areas.
... Presence of a hiatus in the musculature covering anterior portion of the swimbladder, characterizing a pseudotympanum or just reduction of the musculature without hiatus, was previously discussed for a series of species of Hyphessobrycon, including H. brumado Zanata & Camelier, H. negodagua Lima & Gerhard, and H. parvellus (Lima, Gerhard, 2001;Zanata, Camelier, 2010;Dagosta et al., 2014). Hyphessobrycon itaparicensis has a musculature reduction in the humeral region, with a thin layer of muscles in the area between the first and second pleural ribs. ...
Hyphessobrycon itaparicensis was originally described from a small stream in the Itaparica coastal island, Bahia State, Brazil, and has been sampled in several coastal rivers draining Bahia and Sergipe States. Broad examination of type material and recently collected specimens resulted in the redescription provided herein. The presence of one humeral blotch, absence of pseudotympanum, and conservation aspects of H. itaparicensis are briefly discussed. Data obtained from the original description, paratypes and topotypes of H. sergipanus showed broad overlap with H. itaparicensis and absence of morphological diagnostic features supporting the recognition of H. sergipanus as a valid species. Thus, H. sergipanus is considered as junior synonym of H. itaparicensis. We emphasize the need of examining large population samples and type material of similar congeners to avoid improper propositions of new specific names.
