scholarly journals Unrecognized biodiversity in a world’s hotspot: three new species of Melanorivulus (Cyprinodontiformes: Rivulidae) from tributaries of the right bank of the Rio Paraná basin, Brazilian Cerrado

2018 ◽  
Vol 94 (2) ◽  
pp. 263-280 ◽  
Author(s):  
Matheus V. Volcan ◽  
Francisco Severo-Neto ◽  
Luis Esteban K. Lanés
Keyword(s):  
New Species ◽  
Species Group ◽  
The Body ◽  
Conservation Strategies ◽  
Distal Margin ◽  
Brazilian Cerrado ◽  
Mato Grosso ◽  
Paraná Basin ◽  
The Right ◽  
Parana Basin

The genus Melanorivulus presents a wide geographical distribution in the Neotropical region. Among Melanorivulus, the M.pictus species group has currently 18 species distributed in the Brazilian Cerrado, mainly in the upper Rio Paraná basin, with some species occurrences in the upper Rio Araguaia and Tocantins. In the present study, we describe three new Melanorivulus species, belonging to the M.pictus species group from different drainages of the right bank of the Rio Paraná basin in Mato Grosso do Sul state, Brazil. These new species are easily distinguished from the others by their unique colour patterns. Melanorivulusinterruptus is distinguished from all species of the M.pictus group by the presence of oblique chevron-like red bars interrupted, mainly on the midline of the flank in males; while M.ivinhemensis by the yellow colouration of the caudal fin with thin red bars arranged only in the median region of the fin in males. Melanorivulusamambaiensis is distinguished from all species of the M.pictus species group by having an orange anal fin or sometimes more reddish-orange with distal margin grey or dark grey and chevron-like bars along the body, distinctly branched ventrally forming an inverted Y-shape in males. The high diversity of the Melanorivulus species with high levels of endemism demands the development of conservation strategies to avoid the loss of their vulnerable habitats in the Cerrado biome. We expect presence of more species of the M.pictus species group also along the lower reaches of the tributaries of the Rio Paraná. Additionally a dichotomic identification key of the M.pictus species group is provided.

Two new species of Melanorivulus (Cyprinodontiformes: Cynolebiidae) from Rio Verde drainage, Upper Rio Paraná basin, Brazil

Zootaxa ◽  
2017 ◽  
Vol 4236 (1) ◽  
pp. 82 ◽  
Author(s):  
MATHEUS VIEIRA VOLCAN ◽  
BRUNO KLOTZEL ◽  
LUIS ESTEBAN KRAUSE LANÉS
Keyword(s):  
New Species ◽  
Basal Area ◽  
Distal Portion ◽  
Distal Margin ◽  
Mato Grosso ◽  
Light Blue ◽  
Two New Species ◽  
Paraná Basin ◽  
Greenish Blue ◽  
Parana Basin

Two new species of the genus Melanorivulus are herein described from the middle Rio Verde drainage, upper Rio Paraná basin, Mato Grosso do Sul, Brazil. Both new species are members of the Melanorivulus pictus clade, diagnosed by having ventral process of angulo-articular vestigial and flanks intense greenish blue or greenish golden to purplish blue above anal fin base in males. Melanorivulus nigropunctatus, new species, from wetlands of a small drainage tributary of right side of the Rio Verde, differs from all other congeners by possessing black dots over the head and body in both sexes and pectoral fin orange with a dark grey margin in males. Melanorivulus ofaie, new species, is found in a similar environment, but at the opposite margin of the Rio Verde. It is distinguished by males presenting flank greenish blue to light blue, with seven to nine oblique chevron-like red bars, ventral portion of head whitish with dark brown spots, dorsal fin yellow with two to three transverse broad red oblique stripes and distal region red, anal fin light orangish yellow, basal area light blue with short red bars and distal portion with a dark red margin, and caudal fin yellow or orangish yellow with three to four vertical red bars in the dorsal and middle portions, sometimes with a orange distal margin. Both new species are considered endangered due to the loss and degradation of their habitat.

scholarly journals Corumbataia britskii (Siluriformes: Loricariidae: Hypoptopomatinae) a new species from the upper Rio Paraná basin, Mato Grosso do Sul, Central Brazil

Zootaxa ◽  
2007 ◽  
Vol 1386 (1) ◽  
pp. 59-68 ◽  
Author(s):  
KATIANE M. FERREIRA ◽  
ALEXANDRE C. RIBEIRO
Keyword(s):  
New Species ◽  
Mato Grosso ◽  
Central Brazil ◽  
Paraná Basin ◽  
Parana Basin ◽  
Mato Grosso Do Sul ◽  
A New Species

A new Hypoptopomatinae, Corumbataia britskii, is described based on specimens recently collected in a tributary of the upper Rio Paraná basin, Mato Grosso do Sul State, Brazil. Corumbataia britskii differs from its congeners by having a more depressed head profile (vs. a more rounded head profile in C. cuestae and C. tocantinensis), by having a more developed and conspicuous tuft of enlarged odontodes on the tip of the supraoccipital (vs. its reduced condition found in C. cuestae and C. tocantinensis), and by heaving a partially enclosed arrector fossae (vs. an almost completely enclosed arrector fossae in C. cuestae and C. tocantinensis).

Description of a new species of the Melanorivulus pictus species-group (Cyprinodontiformes: Rivulidae) from the Rio Paraná basin in Brazil

Zootaxa ◽  
2020 ◽  
Vol 4852 (1) ◽  
pp. 125-132
Author(s):  
ERIC VENTURINI YWAMOTO ◽  
DALTON TAVARES BRESSANE NIELSEN ◽  
CLAUDIO OLIVEIRA
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Rio Grande ◽  
Species Group ◽  
Sao Paulo ◽  
Paulo State ◽  
Paraná Basin ◽  
Parana Basin ◽  
Ventral Area ◽  
A New Species

A new species of the genus Melanorivulus belonging to the Melanorivulus pictus species group is herein described, from a tributary of the Rio Grande, Rio Paraná basin, São Paulo State, Brazil. The new species can be distinguished from all other species of the Melanorivulus pictus species group by the unique presence of sides of body of males light bluish gray with 10–12 oblique red bars, 8 of which chevron-like, bifurcated and complete, i.e., running from dorsum to ventral area, and 2–4 incomplete, with vertices of the chevron-like bars along midbody, pointing forward. Comments on the putative relationships of the new species, as well as concerning its conservation status, are presented. 

scholarly journals Characidium heirmostigmata, a new characidiin fish (Characiformes: Crenuchidae) from the upper rio Paraná basin, Brazil

2008 ◽  
Vol 6 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Weferson J. da Graça ◽  
Carla S. Pavanelli
Keyword(s):  
New Species ◽  
Lateral Line ◽  
The Body ◽  
Morphometric Traits ◽  
Paraná Basin ◽  
Parana Basin

Characidium heirmostigmata new species is described from the rio Ivaí drainage, upper rio Paraná basin, Paraná State, Brazil. The new species is diagnosed among its congeners by the possession of eight to 11 incomplete oblique dark bars on the body sides, extending upwards and downwards from the lateral line, independently of the eight or nine dorsal transverse bars usually present in species of Characidium. The new species is similar to Characidium serrano from the upper rio Uruguay basin, but differs by meristic and morphometric traits.

Neoplecostomus canastra, a new catfish (Teleostei: Siluriformes) species from upper Rio Paraná basin

Zootaxa ◽  
2017 ◽  
Vol 4294 (2) ◽  
pp. 226 ◽  
Author(s):  
FÁBIO F. ROXO ◽  
GABRIEL S. C. SILVA ◽  
CLÁUDIO H. ZAWADZKI ◽  
CLAUDIO OLIVEIRA
Keyword(s):  
New Species ◽  
Molecular Techniques ◽  
The Body ◽  
Head Length ◽  
Caudal Peduncle ◽  
Dorsal Fin ◽  
Interorbital Width ◽  
Paraná Basin ◽  
Adipose Fin ◽  
Parana Basin

In this study, we describe a new species of Neoplecostomus from córrego Tamborete, municipality of Capitólio, Minas Gerais state, upper rio Paraná basin. The new species is distinguished from its congeners by the presence of conspicuous dark spots all over the body. Moreover, the new species can be diagnosed by the absence of moderate keels along each lateral series of plates, presence of developed adipose fin, absence of enlarged, fleshy folds between dentaries, dorsal-fin spinelet larger than dorsal-fin spine, lacking enlarged odontodes along lateral margins of snout and along ridges before eyes, having reduced number of dentary teeth, having two irregular and conspicuous rows of large and transversally-flattened papillae, just posterior to dentary teeth, smaller mandibullary width/head length, smaller Interorbital width/mandibullary width, smaller number of lateral-line plates, higher and lower number of dentary teeth depending of the species compared, absence of a conspicuous sexual dimorphism, absence of a conspicuous horseshoe-shaped light blotch posterior to the supraoccipital, with a central dark area which rarely contacts the edge of the light area, smaller mandibulary width/head length, smaller Interorbital width/Mandibullary width and a greater Caudal peduncle length/Caudal peduncle depth. Furthermore, we used DNA barcoding techniques of 2% threshold criteria and GMYC model to distinguish the new species from its congeners. These molecular techniques were unable to distinguish the new species from N. langeanii and N. selenae from N. botucatu, that were differentiated using external morphology. 

A new species of Satanoperca (Teleostei: Cichlidae) from the Rio Tocantins basin, Brazil

2021 ◽  
Vol 19 (4) ◽  
Author(s):  
Renata Rúbia Ota ◽  
Gabriel de Carvalho Deprá ◽  
Sven Kullander ◽  
Weferson Júnio da Graça ◽  
Carla Simone Pavanelli
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Species Group ◽  
Congeneric Species ◽  
Different Types ◽  
Paraná Basin ◽  
Parana Basin ◽  
A New Species

Abstract A new species of Satanoperca is described from the Rio Araguaia, Rio Tocantins basin, Brazil, and non-native records are available in the upper Rio Paraná basin. It differs from congeneric species by color pattern characters, such as head and flank marks. It is included in the Satanoperca jurupari species group, characterized by the absence of black rounded blotches on the flank, and low meristic values. A description of the ontogeny of melanophore marks of the S. jurupari species group revealed two different types of arrangement on the flank and numerous melanophore marks on the head. A discussion on morphologically diverse assemblages in the S. jurupari species group is also provided.

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

2005 ◽  
Vol 3 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Wilson J. E. M. Costa
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Color Patterns ◽  
Caudal Fin ◽  
Mato Grosso ◽  
Central Brazil ◽  
Unique Color ◽  
Fin Rays ◽  
Paraná Basin ◽  
Parana Basin

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.

Two new species of Aegopsis Burmeister, 1847 (Coleoptera: Scarabaeidae: Dynastinae) from the central Brazilian Cerrado

Zootaxa ◽  
2018 ◽  
Vol 4526 (2) ◽  
pp. 175
Author(s):  
RAFAEL SOBRAL ◽  
PASCHOAL C. GROSSI ◽  
JOSÉ W. DE MORAIS
Keyword(s):  
New Species ◽  
Minas Gerais ◽  
Brazilian Cerrado ◽  
Distribution Map ◽  
Mato Grosso ◽  
Male And Female ◽  
Two New Species

Two new species of Aegopsis Burmeister, 1847 (Coleoptera: Scarabaeidae: Dynastinae: Agaocephalini), Aegopsis diceratops Sobral & Grossi new species and Aegopsis vazdemelloi Sobral & Grossi new species, are described and illustrated based on specimens collected in Cerrado habitat in the Brazilian states of Minas Gerais and Mato Grosso. The new species are similar to A. bolboceridus (Thomson, 1860). A redescription of A. bolboceridus is provided along with remarks comparing characters among these three species. A distribution map and a male and female key to the species in the genus are provided. 

scholarly journals A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil

2014 ◽  
Vol 86 (1) ◽  
pp. 135-145 ◽  
Author(s):  
VICTOR E. PAULIV ◽  
ELISEU V. DIAS ◽  
FERNANDO A. SEDOR ◽  
ANA MARIA RIBEIRO
Keyword(s):  
New Species ◽  
Longitudinal Section ◽  
Optical Microscope ◽  
Late Paleozoic ◽  
Southern Brazil ◽  
Fossil Assemblage ◽  
Transversal Section ◽  
Paraná Basin ◽  
Parana Basin ◽  
A New Species

The Brazilian records on Xenacanthiformes include teeth and cephalic spines from the Parnaíba, Amazonas and Paraná basins. This work describes a new species of Xenacanthidae, collected in an outcrop of Serrinha Member of Rio do Rasto Formation (Wordian to Wuchiapingian), Paraná Basin, municipality of Jacarezinho, State of Paraná. The teeth of the new species are two or three-cuspidated and the aboral surface show a smooth concavity and one rounded basal tubercle. The coronal surface presents one semi-spherical and subcircular coronal button, and also two lateral main cusps and one central (when present) with less than one fifth of the size of the lateral cusps in the labial portion. The lateral cusps are asymmetric or symmetric, rounded in transversal section, lanceolate in longitudinal section, devoid of lateral carinae and lateral serrations, and with few smooth cristae of enameloid. In optical microscope the teeth show a trabecular dentine (osteodentine) base, while the cusps are composed by orthodentine, and the pulp cavities are non-obliterated by trabecular dentine. The fossil assemblage in the same stratigraphical level and in the whole Rio do Rasto Formation indicates another freshwater record for xenacanthid sharks.

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