Descrição de cinco novas espécies de Rivulus das bacias dos rios Paraná e São Francisco (Cyprinodontiformes, Rivulidae)

Costa, Wilson J. E. M.

doi:10.1590/s0101-81751989000300012

Cited by 8 publications

(11 citation statements)

References 3 publications

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“…The sampling area was limited to areas with dense vegetation rooted on the bank as the species uses these sites as refuges from predators (Schindler & Etzel, 2008). The fishes caught were identified based on the papers of Costa (1989Costa ( , 2005Costa ( , and 2011 as an undescribed species belonging to the Melanorivulus punctatus species complex, and named herein as Melanorivulus aff. punctatus.…”

Section: Methodsmentioning

confidence: 99%

“…Most work in relation to the Rivulidae family mainly emphasizes the morphological analyses relative to phylogeny (Parenti, 1981;Costa, 1989Costa, , 1990Costa, , 2005 molecular (Murphy & Collier, 1997;Costa, 2011) and reproduction (Arenzon et al, 1999;Shibatta, 2005;Arezo et al, 2007;Gonçalves et al, 2011). However, only one study used histological analyzes as a tool for the understanding of its reproductive cycle (Arezo et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gametogenesis and reproductive cycle of Melanorivulus aff. punctatus (Boulenger, 1895) (Cyprinodontiformes, Rivulidae) in Chapada dos Guimarães, Mato Grosso, Brazil

et al. 2013

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The comprehension of the reproductive cycle allows to understand which are the morphological changes that develop in the gonad during this interval. Thus, many studies have been undertaken in order to describe and classify the stages of gonadal development and reproductive status of Neotropical fishes. For this purpose, specimens of Melanorivulus aff. punctatus were collected in a permanent dam in Chapada dos Guimarães, Mato Grosso, Brazil. The gonads were prepared for analysis by light microscopy. The oogenesis and spermatogenesis have been described, characterizing the stages of gonadal development, together with assessments of the gonadosomatic ratio, germ cell count and verification of variation of mature oocytes in females. Throughout the year the male gonads presented themselves as capable of reproducing, characterized by the presence of undifferentiated and differentiated spermatogonia, spermatocytes organized into cysts, spermatids in cysts whose wall was thicker and the spermatozoa was free in the lumen and the duct. This can indicate a continuous reproductive cycle with split spermiation. The females had gonads in the development stage from May to September with undifferentiated and differentiated oogonias and early oocytes always facing the lumen, abundant pre-vitellogenic and vitellogenic oocytes and some atresias. In the phase capable of spawning, observed from October to March, the mature oocytes are abundant, there are many post-ovulatory complexes and some atresia in advanced stage. The regression, observed in some individuals from February to April, is characterized by ovaries with many atresias and post-ovulatory complexes. The same results were found in the quantitative assessments. Therefore, it may be characterized as discontinuous cycle with split spawning. Thus, the reproductive cycle of this species can be characterized as continuous for males and discontinuous for females, which have a most intense phase of reproduction from October to March. However, both have fractional release of gametes.A compreensão do ciclo reprodutivo possibilita entender quais são as mudanças morfológicas que se desenvolvem na gônada neste período. Assim, muitos estudos têm sido realizados no intuito de descrever e classificar as fases de desenvolvimento gonadal e dos estados reprodutivos dos peixes da região Neotropical. Com esse objetivo foram coletados espécimes de Melanorivulus aff. punctatus em um represamento permanente em Chapada dos Guimarães, Mato Grosso, Brasil. As gônadas foram preparadas para análise à microscopia de luz. A ovogênese e a espermatogênese foram descritas e caracterizados os estágios de desenvolvimento gonadal, juntamente com as avaliações de razão gonadossomática, contagem de células germinativas e verificação de variação de ovócitos maduros em fêmeas. Durante todo o ano as gônadas masculinas apresentaram-se como aptas a reprodução, caracterizadas pela presença de espermatogônias indiferenciadas e diferenciadas, espermatócitos organizados em cistos, espermátides em cistos com parede mai...

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gametogenesis and reproductive cycle of Melanorivulus aff. punctatus (Boulenger, 1895) (Cyprinodontiformes, Rivulidae) in Chapada dos Guimarães, Mato Grosso, Brazil

et al. 2013

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“…Rivulus apiamici, R. pictus, R. pinima, and R. vittatus are endemic to the upper rio Paraná basin, central Brazilian plateau. Rivulus punctatus is distributed in the rio Paraguay lowlands in Brazil, Bolivia, Paraguay, and Argentina (Costa, 1989;1995a;2003a).…”

Section: Introductionmentioning

confidence: 99%

Seven new species of the killifish genus Rivulus (Cyprinodontiformes: Rivulidae) from the Paraná, Paraguay and upperAraguaia river basins, central Brazil

Costa¹

2005

Neotrop. ichthyol.

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Seven new species of the Rivulus punctatus group collected during recent field studies in central Brazil are described. Rivulus dapazi n. sp., from the upper rio Correntes drainage, rio Paraguay basin, is diagnosed by a unique color pattern of the anal and caudal fins in males; R. cyanopterus n. sp., from the upper rio São Lourenço drainage, rio Paraguay basin, is diagnosed by a unique color pattern of the anal fin in both sexes; R. rossoi n. sp., from the rio Inhanduí drainage, rio Paraná basin, is diagnosed by a unique color pattern of the caudal fin in males and a reduced number of gill rakers on the first branchial arch; R. litteratus n. sp., from the upper rio Araguaia basin, is diagnosed by unique color patterns of flank in males and caudal fin in females; R. rutilicaudus n. sp., from the rio Verde drainage in Goiás, rio Paraná basin, is diagnosed by a unique color pattern of the caudal fin in females; R. scalaris n. sp., from the rio Sucuruí, rio Aporé, rio Correntes and rio Taquari drainages, rio Paraná basin, is diagnosed by a unique color pattern of the flank in males; and, R. egens n. sp., from the upper rio Verde drainage in Mato Grosso do Sul, rio Paraná basin, is distinguished by a combination of frontal E-scale pattern and the absence of red marks on the caudal fin in males. Combinations of other color patterns and morphological features, including number of scales of the longitudinal series, number of dorsal, anal, caudal and pectoral fin-rays, relative position of dorsal-fin origin and anal-fin rays, and number of vertebrae, are also useful in identification of the new species, but phylogenetic relationships among them are unknown at the present. A key to identification of species of Rivulus from the rio Paraná-Paraguay basin and adjacent headstreams is provided.
Sete espécies novas do grupo Rivulus punctatus coletadas durante estudos de campo recentes no Brasil central são descritas. Rivulus dapazi sp. n., da drenagem do alto rio Correntes, bacia do rio Paraguai, é diagnosticada por um padrão de colorido exclusivo das nadadeiras anal e caudal em machos; R. cyanopterus sp. n., da drenagem do alto rio São Lourenço, bacia do rio Paraguai, é diagnosticada por um padrão de colorido exclusivo da nadadeira anal em ambos sexos; R. rossoi sp. n., da drenagem do rio Inhanduí, bacia do rio Paraná, é diagnosticada por um padrão de colorido exclusivo da nadadeira caudal em machos e número reduzido de rastros branquiais no primeiro arco branquial; R. litteratus sp. n., da drenagem do alto rio Araguaia, é diagnosticada por um padrão de colorido exclusivo do flanco em machos e da nadadeira caudal em fêmeas; R. rutilicaudus sp. n., da drenagem do rio Verde em Goiás, bacia do rio Paraná, é diagnosticada por um padrão exclusivo da nadadeira caudal em fêmeas; R. scalaris sp. n., das drenagens do rios Sucuruí, Aporé, Correntes e Taquari, bacia do rio Paraná, é diagnosticada por um padrão de colorido exclusivo do flanco em machos; e, R. egens sp. n., da drenagem do alto rio Verde no Mato Grosso do Sul, bacia do ri...

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“…Figs 1-2, Table 1 Rivulus pictus (non Rivulus pictus Costa, 1989);Costa 1995: 216 (misidentification Description. Morphometric data appear in Table 1.…”

Section: Melanorivulus Proximus Sp Nmentioning

confidence: 99%

“…The M. pictus group was first studied by Costa (1989), based on fish collections deposited in the Museu de Zoologia, Universidade de São Paulo, when M. apiamici (Costa, 1989), M. pictus (Costa, 1989) and M. vittatus (Costa, 1989) were described. In September 1994, efforts were directed to firstly sample typical Melanorivulus habitats along the Paraná River Basin, but based on the great morphological variability found among populations inhabiting close neighbouring areas, Costa (1995) concluded that all populations of this vast geographical area belong to a single polymorphic species, M. pictus.…”

Section: Introductionmentioning

confidence: 99%

Three new species of the killifish genus Melanorivulus from the Rio Paraná Basin, central Brazilian Cerrado (Cyprinodontiformes, Aplocheilidae)

Costa¹

2018

ZSE

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Three new species of Melanorivulus are described from the upper and middle Rio Paraná Basin, central Brazilian Cerrado. These species are members of the M. pictus species group, endemic to central Brazilian plateaus and adjacent areas, and are easily diagnosed by colour pattern characters, but their relationships with other congeners of the group are still uncertain. Melanorivulus proximus sp. n., from the middle Rio Aporé drainage, and M. nigromarginatus sp. n., from the Rio Corrente drainage, are possibly more closely related to other species endemic to streams draining the slopes of the Caiapó range, whereas M. linearis sp. n., from the upper Rio Pardo drainage, middle Rio Paraná Basin, is considered more closely related to M. egens, a species also endemic to this part of the Basin. This study corroborates the high diversity of species of Melanorivulus in the central Brazilian Cerrado plateaus repeatedly reported in previous studies, indicating once more that different species are often found restricted to short segments of the same river drainage. The intense habitat loss recorded in recent years combined to the high species diversity limited to specific Cerrado freshwater ecosystems, the veredas, indicates that species of Melanorivulus endemic to this part of the Brazilian Cerrado are highly threatened with extinction.

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Descrição de cinco novas espécies de Rivulus das bacias dos rios Paraná e São Francisco (Cyprinodontiformes, Rivulidae)

Cited by 8 publications

References 3 publications

Gametogenesis and reproductive cycle of Melanorivulus aff. punctatus (Boulenger, 1895) (Cyprinodontiformes, Rivulidae) in Chapada dos Guimarães, Mato Grosso, Brazil

Gametogenesis and reproductive cycle of Melanorivulus aff. punctatus (Boulenger, 1895) (Cyprinodontiformes, Rivulidae) in Chapada dos Guimarães, Mato Grosso, Brazil

Seven new species of the killifish genus Rivulus (Cyprinodontiformes: Rivulidae) from the Paraná, Paraguay and upperAraguaia river basins, central Brazil

Three new species of the killifish genus Melanorivulus from the Rio Paraná Basin, central Brazilian Cerrado (Cyprinodontiformes, Aplocheilidae)

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