scholarly journals A new colorful species of Geophagus (Teleostei: Cichlidae), endemic to the rio Aripuanã in the Amazon basin of Brazil

2014 ◽  
Vol 12 (4) ◽  
pp. 737-746 ◽  
Author(s):  
Gabriel C. Deprá ◽  
Sven O. Kullander ◽  
Carla S. Pavanelli ◽  
Weferson J. da Graça
Keyword(s):  
New Species ◽  
Fish Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Congeneric Species ◽  
Black Spots

Geophagus mirabilis, new species, is endemic to the rio Aripuanã drainage upstream from Dardanelos/Andorinhas falls. The new species is distinguished from all other species of the genus by the presence of one to five large black spots arranged longitudinally along the middle of the flank, in addition to the black midlateral spot that is characteristic of species in the genus and by a pattern of iridescent spots and lines on the head in living specimens. It is further distinguished from all congeneric species, except G. camopiensisand G. crocatus, by the presence of seven (vs. eight or more) scale rows in the circumpeduncular series below the lateral line (7 in G. crocatus; 7-9 in G. camopiensis). Including the new species, five cichlids and 11 fish species in total are known only from the upper rio Aripuanã, and 15 fish species in total are known only from the rio Aripuanã drainage.

scholarly journals Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Rafaela Priscila Ota ◽  
Valéria Nogueira Machado ◽  
Marcelo C. Andrade ◽  
Rupert A. Collins ◽  
Izeni Pires Farias ◽  
...  
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Morphological Diversity ◽  
Common Species ◽  
Color Pattern ◽  
Integrative Taxonomy ◽  
Striking Similarity ◽  
Species Discovery ◽  
A New Species

ABSTRACT Pacus of the genus Myloplus represent a formidable taxonomic challenge, and particularly so for the case of M. asterias and M. rubripinnis, two widespread and common species that harbor considerable morphological diversity. Here we apply DNA barcoding and multiple species discovery methods to find candidate species in this complex group. We report on one well-supported lineage that is also morphologically and ecologically distinct. This lineage represents a new species that can be distinguished from congeners by the presence of dark chromatophores on lateral-line scales, which gives the appearance of a black lateral line. It can be further diagnosed by having 25-29 branched dorsal-fin rays (vs. 18-24), 89-114 perforated scales from the supracleithrum to the end of hypural plate (vs. 56-89), and 98-120 total lateral line scales (vs. 59-97). The new species is widely distributed in the Amazon basin, but seems to have a preference for black- and clearwater habitats. This ecological preference and black lateral line color pattern bears a striking similarity to the recently described silver dollar Metynnis melanogrammus.

scholarly journals A new species of Boehlkea (Characiformes: Characidae: Stevardiinae) from the rio Japurá, Amazon basin, Brazil

2017 ◽  
Vol 15 (3) ◽  
Author(s):  
Isabel M. Soares ◽  
Vinicius A. Bertaco ◽  
Priscila Madoka M. Ito ◽  
Jansen Zuanon
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Color Pattern ◽  
Distal Portion ◽  
Lower Number ◽  
Dorsal Fin ◽  
Basal Half ◽  
A New Species ◽  
Pelvic Fin

ABSTRACT A new species of Boehlkea is described from rio Japurá, Amazon basin. The new species differs from B. fredcochui by the presence of a vertically elongate humeral spot (vs. absence), complete lateral line (vs. incomplete), four rows of scales below lateral line (vs. three), and lower number of branched anal-fin rays (17-21 vs. 22-25), and from B. orcesi by the higher number of maxillary teeth (13-14 vs. 5-12), greater head length (27.9-29.9% vs. 24.3-27.5% of SL), and by the color pattern (basal half of dorsal-fin, distal portion of pelvic-fin, lower caudal-fin lobe and anal-fin with black chromatophores vs. absence of black chromatophores in the fins).

Description of a new species of Leporinus (Characiformes: Anostomidae) from the Rio Tapajós basin, Brazil

Zootaxa ◽  
2019 ◽  
Vol 4603 (1) ◽  
pp. 183
Author(s):  
HERALDO A. BRITSKI ◽  
JOSÉ L. BIRINDELLI
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Color Pattern ◽  
Dental Formula ◽  
Caudal Peduncle ◽  
A New Species

A new species of Leporinus is described from the rio Teles Pires, rio Tapajós basin, Amazon basin, Brazil. The new species is diagnosed based on dental formula 3/4, a dark midlateral stripe on body and a series of transversal dark bars on the dorsum. The new species is similar to a handful of congeners based on the color pattern, including L. britski, L. microphysus, L. parvulus, and L. vanzoi, all of which also occur at the rio Tapajós basin. The new species is distinguished from the aforementioned congeners based on number of premaxillary teeth, number of scales in lateral line and/or around caudal peduncle. The new species is apparently endemic to the rio Teles Pires near the Sete Quedas rapids and upstream.

scholarly journals Hemiodus langeanii (Characiformes: Hemiodontidae), a new species from rio Amana, rio Maués-Açú drainage, Amazon basin, Brazil

2012 ◽  
Vol 10 (2) ◽  
pp. 255-262 ◽  
Author(s):  
Hélio Beltrão ◽  
Jansen Zuanon
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Dark Spot ◽  
Similar Species ◽  
New Taxon ◽  
High Body ◽  
Eye Diameter ◽  
A New Species ◽  
Pelvic Fin

Hemiodus langeanii, new species, is described based on 20 specimens collected in the rio Amana, a tributary of rio Maués-Açú, rio Amazonas drainage, Brazil. The new taxon can be distinguished from its congeners by its high body (27.1-35.3%, average 32.3% SL vs. 18.8-28.5% in remaining species). The new species also exhibits a large lateral dark spot that is equal to, or greater than, the eye diameter (vs. smaller in remaining species except for H. microlepis). The lack of conspicuous lateral stripe or transverse bands and the low lateral line scales count (68-74) distinguish H. langeanii from some similar species in the genus (scale counts: 94-123 in H. argenteus, 124-148 in H. microlepis, 86-99 in H. orthonops and 77-92 in H . parnaguae). Finally, the new species can be differentiated from H. unimaculatus (which overlaps in the number of lateral line scales) by the higher number of scales between the lateral line and the pelvic fin origin (9-10 vs. 4-7, respectively), which are similar sized above and below lateral line (vs. scales larger bellow the lateral line in H. unimaculatus).

A new species of Moenkhausia Eigenmann, 1903 (Characiformes: Characidae) from Amazon basin, Brazil

Zootaxa ◽  
2016 ◽  
Vol 4208 (4) ◽  
pp. 392 ◽  
Author(s):  
ISABEL MATOS SOARES ◽  
CRISTINA MOTTA BÜHRNHEIM
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Middle Portion ◽  
Horizontal Stripe ◽  
Dark Stripe ◽  
A New Species

A new species of Moenkhausia is described from tributaries of the lower Amazon basin, Pará State, Brazil. The new species is morphologically similar to Moenkhausia collettii, M. copei, and M. venerei by the presence of a dark horizontal stripe across the middle portion of the eye, a conspicuous slightly rounded humeral blotch, a dark longitudinal midlateral stripe and a dark stripe along the anal-fin base. However, the new species can be distinguished from M. collettii, M. copei, and M. venerei mainly by the number of cusps on the inner row of the premaxillary, maxillary and dentary teeth, and by the number of scales in transversal series above and below the lateral line. 

Bryconops magoi and Bryconops collettei (Characiformes:  Characidae), two new freshwater fish species from Venezuela,  with comments on B. caudomaculatus (Günther)

Zootaxa ◽  
2005 ◽  
Vol 1094 (1) ◽  
pp. 1 ◽  
Author(s):  
BARRY CHERNOFF ◽  
ANTONIO MACHADO-ALLISON
Keyword(s):  
New Species ◽  
Freshwater Fish ◽  
Fish Species ◽  
Lateral Line ◽  
Color Patterns ◽  
Morphometric Characteristics ◽  
Gill Rakers ◽  
Freshwater Fish Species ◽  
Red Color ◽  
Amazonas State

Bryconops collettei and B. magoi  are described from the Caura and Miamo (Bolívar State), Iguapo (Amazonas State) and Moquete (Anzoátegui State) rivers, Venezuela.  These new species belong to the subgenus Bryconops, based upon apomorphies of the jaws and gill rakers and are compared with members of the subgenus.  Based on morphology, meristics and color patterns, B. collettei and B. magoi are distinguished from B. caudomaculatus, the closest species in the subgenus, by having a generally more slender body, pored scales of the lateral line extending beyond the hypural plate, and a diffuse ocellus partially filled with red color only on the upper lobe of the caudal fin.  Bryconops collettei is distinguished from B. magoi on the basis of meristic and morphometric characteristics.  B. caudomaculatus has been largely misidentified in the literature and we provide comments as a guide to its proper recognition.

scholarly journals Channa pardalis, a new species of snakehead (Teleostei: Channidae) from Meghalaya, northeastern India

2016 ◽  
Vol 8 (3) ◽  
pp. 8583 ◽  
Author(s):  
J.D. Marcus Knight
Keyword(s):  
New Species ◽  
Lateral Line ◽  
The Body ◽  
Colour Pattern ◽  
Northeastern India ◽  
Dorsal Fin ◽  
Black Spots ◽  
Fin Rays ◽  
Orbital Region ◽  
A New Species

Channa pardalis, a new species of snakehead, is described from Khasi Hills, Meghalaya, northeastern India.  This species can be distinguished from its congeners by a unique colour pattern consisting of numerous large black spots on the post-orbital region of the head, opercle and body; a broad white and black margin to the dorsal, anal and caudal fins; 36–37 dorsal fin rays; 24–25 anal fin rays; 44–45 pored scales on the body and two scales on the caudal fin base; 4½ scales above lateral line and 6½ scales below lateral line; 45 vertebrae and the palatine with two rows of teeth: outer row with numerous minute teeth and inner row with short, stout inward curved teeth.  

Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)

Zootaxa ◽  
2011 ◽  
Vol 2776 (1) ◽  
pp. 13 ◽  
Author(s):  
MARCELO R. DE CARVALHO ◽  
NATHAN R. LOVEJOY
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Phylogenetic Relationships ◽  
Amazon Basin ◽  
New Genus ◽  
Sister Group ◽  
Two New Species ◽  
Anterior Extension ◽  
Molecular Phylogenetic ◽  
Molecular Patterns

The morphology and phylogenetic relationships of a new genus and two new species of Neotropical freshwater stingrays, family Potamotrygonidae, are investigated and described in detail. The new genus, Heliotrygon, n. gen., and its two new species, Heliotrygon gomesi, n. sp. (type-species) and Heliotrygon rosai, n. sp., are compared to all genera and species of potamotrygonids, based on revisions in progress. Some of the derived features of Heliotrygon include its unique disc proportions (disc highly circular, convex anteriorly at snout region, its width and length very similar), extreme subdivision of suborbital canal (forming a complex honeycomb-like pattern anterolaterally on disc), stout and triangular pelvic girdle, extremely reduced caudal sting, basibranchial copula with very slender and acute anterior extension, and precerebral and frontoparietal fontanellae of about equal width, tapering very little posteriorly. Both new species can be distinguished by their unique color patterns: Heliotrygon gomesi is uniform gray to light tan or brownish dorsally, without distinct patterns, whereas Heliotrygon rosai is characterized by numerous white to creamy-white vermiculate markings over a light brown, tan or gray background color. Additional proportional characters that may further distinguish both species are also discussed. Morphological descriptions are provided for dermal denticles, ventral lateral-line canals, skeleton, and cranial, hyoid and mandibular muscles of Heliotrygon, which clearly corroborate it as the sister group of Paratrygon. Both genera share numerous derived features of the ventral lateral-line canals, neurocranium, scapulocoracoid, pectoral basals, clasper morphology, and specific patterns of the adductor mandibulae and spiracularis medialis muscles. Potamotrygon and Plesiotrygon are demonstrated to share derived characters of their ventral lateral-line canals, in addition to the presence of angular cartilages. Our morphological phylogeny is further corroborated by a molecular phylogenetic analysis of cytochrome b based on four sequences (637 base pairs in length), representing two distinct haplotypes for Heliotrygon gomesi. Parsimony analysis produced a single most parsimonious tree revealing Heliotrygon and Paratrygon as sister taxa (bootstrap proportion of 70%), which together are the sister group to a clade including Plesiotrygon and species of Potamotrygon. These unusual stingrays highlight that potamotrygonid diversity, both in terms of species composition and undetected morphological and molecular patterns, is still poorly known.

scholarly journals Two new species of Microglanis (Siluriformes: Pseudopimelodidae) from the upper-middle rio Araguaia basin, Central Brazil

2011 ◽  
Vol 9 (4) ◽  
pp. 697-707 ◽  
Author(s):  
William Benedito Gotto Ruiz ◽  
Oscar Akio Shibatta
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Color Pattern ◽  
Body Color ◽  
Gill Rakers ◽  
Mato Grosso ◽  
Central Brazil ◽  
Two New Species ◽  
Fin Rays

Two new species of Microglanis are described from tributaries of upper-middle rio Araguaia, States of Mato Grosso and Goiás, Brazil. Microglanis oliveirai differs from its congeners by the short supraoccipital process not reaching the small anterior nuchal plate, and reduced number of gill rakers, lateral line pores, ribs, vertebrae, and caudal-fin rays. Microglanis xylographicus differs from its congeners by the presence of melanophores surrounding the neuromasts of the superficial lines, snout length 11.4-12.9% SL and body color pattern consisting of horizontal brown stripes similar to a wooden bark pattern. An identification key of Microglanis species from the Amazon basin is presented.

scholarly journals Two new species of Leporinus Agassiz, 1829 from Araguaia-Tocantins system, Amazon basin, Brazil (Ostariophysi, Anostomidae)

2009 ◽  
Vol 69 (1) ◽  
pp. 109-116 ◽  
Author(s):  
JC. Garavello ◽  
GM. Santos
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Amazon Basin ◽  
Cutting Edge ◽  
Meristic Characters ◽  
Caudal Peduncle ◽  
Transversal Line ◽  
Dorsal Fin ◽  
Two New Species ◽  
Adipose Fin

Two new species of genus Leporinus from the Araguaia-Tocantins system, Amazon, Brazil, are described. Leporinus unitaeniatus n. sp. is distinguished from the remaining species of this genus by the presence of a conspicuous longitudinal dark brown bar along the lateral line on the flanks, and Leporinus geminis n. sp. is distinguished by an inconspicuous dark bar combined with three large and vertically elongated brown blotches on the trunk; the first on the dorsal fin region, the second anterior to the adipose fin and the third on the caudal peduncle. Both are medium-sized species of the genus (up to 150 mm SL) and share the following combination of meristic characters: 4 teeth on each premaxillary and dentary; 40-43 scales in the lateral line, 6/I/5 scales on the transversal line, and 16 series of scales around the caudal peduncle. L. unitaeniatus n. sp. has a sub-terminal mouth and tooth series formed by incisive-like elongated teeth frontally turned and with only a straight cutting edge decreasing in size like the steps of stairs from the teeth pair of symphysis. Leporinus geminis n. sp. has a sub-inferior mouth and the tooth series shaped by large incisive-like teeth forming an arched cutting edge, decreasing in size from the symphysal pair of teeth.

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