Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

Gephyrocharax machadoi, new species, is described from tributaries of the rio Sepotuba, upper rio Paraguai basin, Mato Grosso state, Brazil. The new species is distinguished from its congeners, except Gephyrocharax major, by presenting two modified scales on the ventral caudal-fin lobe (pouch scales): a larger, sexually dimorphic scale, slightly superior and anterior in position, followed by a smaller, posterior and ventrally placed accessory scale (vs. a single modified pouch scale without ventrally placed accessory scales). Gephyrocharax machadoi differs from G. major by presenting a gap (more conspicuous in mature males than in mature females) between the second and third ventral procurrent caudal-fin rays (vs. second and third ventral procurrent caudal-fin rays near each other or fused distally); premaxilla with tricuspid teeth (vs. tetra- to pentacuspid teeth); and body depth 21.5–25.4% of SL (vs. 25.9–36.8% in SL). Spermiogenesis and spermatozoa morphology are also described.

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Two new species of Hyphessobrycon (Teleostei: Characidae) from upper rio Tapajós basin on Chapada dos Parecis, central Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252006000300001 ◽

2006 ◽

Vol 4 (3) ◽

pp. 301-308 ◽

Cited By ~ 20

Author(s):

Tiago Pinto Carvalho ◽

Vinicius Araújo Bertaco

Keyword(s):

New Species ◽

Posterior Margin ◽

Caudal Fin ◽

Mato Grosso ◽

Central Brazil ◽

Dorsal Fin ◽

Two New Species ◽

Fin Rays ◽

Black Band

Two new species of Hyphessobrycon are described from the upper rio Tapajós basin, Mato Grosso, Brazil. Hyphessobrycon melanostichos is distinguished from its congeners by the combination of a conspicuous longitudinal broad black band beginning on the posterior margin of orbit and reaching the tip of middle caudal fin rays, a distinct vertically elongate humeral spot, and 16 to 18 branched anal-fin rays. Hyphessobrycon notidanos is distinguished from its congeners by the combination of an elongate dorsal fin in mature males, a vertically elongate humeral spot, 2-4 maxillary teeth, iii,8 dorsal-fin rays, and 16 to 21 branched anal-fin rays.

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A new species of Farlowella (Siluriformes: Loricariidae) of the F. nattereri species-group from the rio Xingu basin, Mato Grosso, Brazil, with comments on Farlowella jauruensis , a poorly-known species from the upper rio Paraguai basin

Neotropical Ichthyology ◽

10.1590/1982-0224-20160046 ◽

2016 ◽

Vol 14 (3) ◽

Cited By ~ 3

Author(s):

Gustavo A. Ballen ◽

Murilo N. L. Pastana ◽

Luiz A. W. Peixoto

Keyword(s):

New Species ◽

Geographic Distribution ◽

Color Pattern ◽

Species Group ◽

Caudal Fin ◽

Mato Grosso ◽

Fin Rays ◽

Plate Morphology ◽

A New Species

ABSTRACT A new species of Farlowella is described from eighteen specimens collected in the upper rio Xingu basin, Mato Grosso State, Brazil. The new species is a member of the Farlowella nattereri species-group and can be distinguished from other members of the group, with exception of Farlowella jauruensis , by exhibiting a proportionally shorter snout. The new species is distinguished from F. jauruensis by differences on the cleithrum and plate morphology, by counts of pelvic and caudal-fin rays, and by the color pattern of the snout. The discovery of new lots of F. jauruensis , a species so far known only from the holotype, is also herein reported. This discovery represents a considerable expansion of the geographic distribution and of the number of known specimens of F . jauruensis .

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A new species of Schindler's fish (Teleostei: Gobiidae: Schindleria) from the Malay Archipelago (Southeast Asia), with notes on the caudal fin complex of Schindleria

Zootaxa ◽

10.11646/zootaxa.4531.1.4 ◽

2018 ◽

Vol 4531 (1) ◽

pp. 95

Author(s):

HARALD AHNELT ◽

MICHAEL SAUBERER

Keyword(s):

New Species ◽

Body Depth ◽

Caudal Fin ◽

Gobiid Fish ◽

Dorsal Fin ◽

Malay Archipelago ◽

Fin Ray ◽

Fin Rays ◽

A New Species ◽

Radial Plate

Schindleria macrodentata sp. nov., a new species of the paedomorphic gobiid fish genus Schindleria, is described from the Malay Archipelago. The two specimens were collected in 1929 during the “Dana Expedition” in the Molucca Sea between Sulawesi and Halmahera islands (00°29′N, 125°54′E) (Indonesia) and in the Sulu Sea close to Panay Island (11°43’N, 121°43′E) (Philippines). The new species is characterized by a slender body (body depth at pectoral fin base 3.6–3.7 % of SL and at anal fin origin 3.9–4.8 % of SL), a long second dorsal fin (first dorsal fin absent) originating distinctly anterior to the origin of the anal fin (predorsal length 61.8–65.2 % of SL and preanal length 71.7–75.8 % of SL), a short tail (from anus to tip of longest caudal fin ray) (22.1 % of SL), 19–20 dorsal fin rays and 10 anal fin rays, first anal fin ray below 9th dorsal fin ray, few large, widely spaced teeth in the upper and the lower jaws (7 on the premaxilla and 6 on the dentary), an elongated pectoral radial plate (length 3.7–4.5 % of SL) and, in the caudal skeleton, a procurrent ray with an additional spiny process at its base. No distinct urogenital papilla and no pigmentation on body are developed. In this study we present three morphological traits until now not considered as diagnostic characters for Schindleria, the shape of the pectoral radial plate, the shape of the last procurrent caudal spine and the shape of the arch formed by the lower jaw. We also discuss the caudal-fin skeleton of Schindleria, a character developing beyond the larval stages. The record of S. macrodentata is the first of the genus Schindleria for Indonesia and, at more than 100 km distant to the next shore, it is the first offshore record of a Schindler's fish.

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Hyphessobrycon petricolus, a new species of tetra (Characiformes: Characidae) from the rio Madeira basin, Mato Grosso, Brazil

Zootaxa ◽

10.11646/zootaxa.4221.2.8 ◽

2017 ◽

Vol 4221 (2) ◽

pp. 242 ◽

Cited By ~ 4

Author(s):

WILLIAN M. OHARA ◽

FLÁVIO C. T. LIMA ◽

BRUNO S. BARROS

Keyword(s):

New Species ◽

Posterior Margin ◽

Unique Combination ◽

Caudal Fin ◽

Mato Grosso ◽

Fin Rays ◽

A New Species ◽

Rio Madeira

A new species of Hyphessobrycon is described from the rio Roosevelt, rio Madeira basin, Mato Grosso State, Brazil. Hyphessobrycon petricolus sp. n. can be distinguished from its congeners by the unique combination of the following features: a well-defined, relatively narrow dark midlateral stripe on body extending from immediately behind posterior margin of opercle to the middle caudal-fin rays, relatively conspicuous humeral blotch, and 16–20 branched anal-fin rays. Comments on the remaining Hyphessobrycon species presenting a conspicuous dark midlateral stripe are presented.

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A new species of Hyphessobrycon Durbin(Characiformes: Characidae) from the rio Juruena basin, Central Brazil, with notes on H. loweae Costa & Géry

Neotropical Ichthyology ◽

10.1590/s1679-62252013000100004 ◽

2013 ◽

Vol 11 (1) ◽

pp. 33-44 ◽

Cited By ~ 17

Author(s):

Leonardo F. S. Ingenito ◽

Flavio C. T. Lima ◽

Paulo A. Buckup

Keyword(s):

New Species ◽

First Record ◽

Adult Males ◽

Horizontal Scale ◽

Mato Grosso ◽

Central Brazil ◽

Dorsal Fin ◽

Fin Rays ◽

A New Species ◽

Red Coloration

A new species of Hyphessobrycon, H. peugeoti, is described from the middle portions of the rio Juruena drainage, upper rio Tapajós basin, Mato Grosso State, Brazil. It can be distinguished from all congeners, with the exception of H. loweae and H. heliacus, by a filamentous elongation of the dorsal fin and the approximately straight margin of the anal fin in adult males. It can be distinguished from both H. loweae and H. heliacus by an overall red coloration in life (vs. a golden coloration in life in the latter). Additionally, it can be distinguished from H. heliacus by the lack of chevron-like dark markings along the midline (vs. presence of chevron-like dark-markings in H. heliacus), and from H. loweae by the presence of only five horizontal scale rows between the dorsal-fin origin and the lateral line (vs. 6-7 in H. loweae), and the higher number of branched anal-fin rays (21-24, modally 22, vs. 17-21, modally 20, in H. loweae). Additional meristic, morphometric, and distributional data are provided for Hyphessobrycon loweae, including its first record in the rio Araguaia/Tocantins basin. Comments on a putative monophyletic group including H. peugeoti, H. loweae, H. heliacus, H. elachys, and H. moniliger are presented.

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Moenkhausia rubra, a new species from rio Juruena, upper rio Tapajós basin, Brazil (Characiformes: Characidae)

Neotropical Ichthyology ◽

10.1590/1982-0224-20130183 ◽

2014 ◽

Vol 12 (2) ◽

pp. 389-396 ◽

Cited By ~ 5

Author(s):

Murilo N. L. Pastana ◽

Fernando C. P. Dagosta

Keyword(s):

New Species ◽

Caudal Peduncle ◽

Caudal Fin ◽

Mato Grosso ◽

Fin Rays ◽

Dark Pigmentation ◽

A New Species

Moenkhausia rubra, new species, is described from the upper rio Juruena, rio Tapajós basin, Mato Grosso, Brazil. The new species is distinguished from its congeners, except M. hemigrammoidesand M. nigromarginata, by the dark pigmentation on the anteriormost rays of both dorsal and anal fins. Moenkhausia rubrais distinguished from the aforementioned species by the number of branched anal-fin rays 17-20 (vs. 20-25), presence of a dark blotch on the caudal peduncle extending to middle caudal-fin rays, absence of longitudinal black zigzag stripes between longitudinal rows of scales on body, and other details of coloration.

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Silurichthys ligneolus, a new catfish (Teleostei: Siluridae) from southern Borneo, Indonesia

Zootaxa ◽

10.11646/zootaxa.2793.1.5 ◽

2011 ◽

Vol 2793 (1) ◽

pp. 56

Author(s):

HEOK HEE NG ◽

HEOK HUI TAN

Keyword(s):

New Species ◽

Lower Lobe ◽

Branchial Arch ◽

Caudal Peduncle ◽

Body Depth ◽

Caudal Fin ◽

Fin Rays ◽

Eye Diameter ◽

Gill Raker ◽

A New Species

Silurichthys ligneolus, a new species of silurid catfish, is described from blackwater habitats in southern Borneo. The new species can be distinguished from congeners in having a combination of: body depth at anus 9.1–11.0% SL, caudal peduncle depth 4.7–5.5% SL, eye diameter 6.7–9.8% HL, pelvic fins present, 44–45 anal-fin rays, 3–4 principal rays on the lower caudal-fin lobe, lower lobe of caudal fin indistinct, 46–48 vertebrae, one gill raker on the first branchial arch, and body uniformly brown. Based on the morphology of its caudal fin, S. ligneolus is hypothesized to be the sister taxon of S. sanguineus.

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A new species of Bryconamericus (Characidae: Stevardiinae: Diapomini) from the upper rio Paraná basin, Brazil

Neotropical Ichthyology ◽

10.1590/1982-0224-20170028 ◽

2017 ◽

Vol 15 (3) ◽

Cited By ~ 2

Author(s):

Fernando C. Jerep ◽

Oscar A. Shibatta

Keyword(s):

New Species ◽

Valid Species ◽

Sexually Dimorphic ◽

Body Depth ◽

Fin Rays ◽

Paraná Basin ◽

Parana Basin ◽

Cis And Trans ◽

In Cis ◽

A New Species

ABSTRACT Bryconamericus is the most diverse genus within Stevardiinae, comprising 61 valid species distributed in Cis- and Trans-Andean basins from Panama in Central America to northern Argentina in South America. Three species are known from the upper rio Paraná basin: B. exodon, B. iheringii, and B. turiuba. Herein we describe a new species of Bryconamericus from the upper rio Paraná basin inhabiting tributaries of Ivaí, Piquiri, and Tibagi basins, Paraná State, Brazil. The new species differs from its congeners by the presence of unaligned teeth in the outer tooth row of the premaxilla; a single, vertical, dorsally expanded and rounded humeral spot; 36-39 pored scales in the longitudinal series; body depth 31.6-37.9% SL; anal-fin base length 24.8-30.1% SL; number of branched anal-fin rays 19-22, and bony hooks on pelvic- and anal-fin rays of sexually dimorphic males. The new species is syntopic with other Stervadiinae in the upper rio Paraná basin such as B. iheringii, B. turiuba, Piabarchus stramineus, and Piabina argentea.

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Description of a new species of the genus Leporinus Spix (Characiformes: Anostomidae) from the rio Araguaia, Brazil, with comments on the taxonomy and distribution of L. parae and L. lacustris

Neotropical Ichthyology ◽

10.1590/s1679-62252008000100005 ◽

2008 ◽

Vol 6 (1) ◽

pp. 45-51 ◽

Cited By ~ 13

Author(s):

Heraldo A. Britski ◽

José L. O. Birindelli

Keyword(s):

New Species ◽

Lateral Line ◽

Unique Feature ◽

Dental Formula ◽

Caudal Fin ◽

Mato Grosso ◽

Transversal Line ◽

Fin Rays ◽

A New Species ◽

Deep Body

A new species of the genus Leporinus is described from the rio Araguaia, in Mato Grosso and Goiás states, Brazil. The new species has the dental formula 4/3, a unique feature within the genus; all other species of Leporinus have dental formulae 3/3, 3/4 or 4/4. In addition, the new species can also be distinguished by the following combination of characters: 36 to 37 scales in the lateral line, 4/4.5 or 4/5 series of scales in the transversal line, 16 circumpeduncular scale series, anal fin surpassing base of lower caudal-fin rays and three blotches along the lateral line. The new species shares with L. parae and L. lacustris a rather deep body, terminal mouth, long anal fin, three small dark blotches on the lateral line, the latter two, particularly the last one, usually fading, and preference for lentic habitats. Comments on the taxonomy and distribution of the species L. parae and L. lacustris are provided.

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Hemigrammus ataktos: a new species from the rio Tocantins basin, central Brazil (Characiformes: Characidae)

Neotropical Ichthyology ◽

10.1590/1982-0224-20130091 ◽

2014 ◽

Vol 12 (2) ◽

pp. 257-264 ◽

Cited By ~ 9

Author(s):

Manoela M. F. Marinho ◽

Fernando C. P. Dagosta ◽

José L. O. Birindelli

Keyword(s):

New Species ◽

Lateral Line ◽

Posterior Margin ◽

The Body ◽

Caudal Fin ◽

Central Brazil ◽

Fin Rays ◽

Complete Series ◽

A New Species

A new species of Hemigrammus is described from the middle rio Tocantins basin, central Brazil. The new species can be distinguished from all congeners by having a black midlateral stripe on the body extending from the posterior margin of the eye to the median caudal-fin rays. Mature males possess dorsal-, pelvic-, and anal-fin rays elongate, features that also help to recognize the new species. Although the new species is described in Hemigrammus, some specimens present a complete series of pored scales in the lateral line. A discussion about the generic allocation of the new species is presented.

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