Topic
Neoplecostomus
About: Neoplecostomus is a research topic. Over the lifetime, 18 publications have been published within this topic receiving 179 citations.
Papers
TL;DR: Three new species, of three different genera of loricariids, are described from the headwaters of Serra da Mantiqueira and Cadeia do Espinhaço, in Southeastern Minas Gerais State, Brazil.
Abstract: Three new species, of three different genera of loricariids, are described from the headwaters of Serra da Mantiqueira and Cadeia do Espinhaco, in Southeastern Minas Gerais State, Brazil. In this region, the Serra da Mantiqueira and the Complexo do Espinhaco are the highest points of the Brazilian Shield and delimits the headwaters of four drainages: Sao Francisco, Parana, Doce and Paraiba do Sul basins. Harttia intermontana, n. sp., is described from the headwaters of the Rio Doce basin and is the first record of the genus in this basin. The new species can be distinguished from its congeners by the pattern of abdominal covering, presence of preanal plates, presence and pattern of ornamentation of canal plate, and some characteristics related to sexual dimorphism. Pareiorhaphis togoroi, n. sp., is described from the headwaters of the Rio das Mortes basin, tributary to the Rio Grande, in the upper Rio Parana drainage, and represents the first record of the genus to this drainage, thus expanding its geographic distribution. It can be distinguished from most congeners by the absence of preadipose azygous plates, and characteristics related to secondary sexual characters of mature males: presence of odontodes on the lateral margin of head plus the absence of long hypertrophied odontodes on pectoral-fin spine. Neoplecostomus pirangaensis, n. sp., is described from the headwaters of the Rio Piranga, Rio Doce basin. The new species differs from all congeners by the much-reduced dermal platelets on the abdomen, devoid of developed odontodes between the insertions of the pectoral and pelvic fins. Neoplecostomus pirangaensis can also be distinguished from all congeners, except N. botucatu and N. paranensis, due to the complete absence of vestiges of the adipose fin (vs. vestiges, or adipose fin moderate to well developed and always present). The new species differs from N. botucatu by the absence of conspicuous dark spots all over the body and the presence of common dorsal bands in juveniles, and almost totally black in adults. It differs from N. paranensis by the bigger and less numerous teeth. Additionally, the new species differs from Neoplecostomus doceensis by the absence of enlarged fleshy folds between dentaries, and absence of a lateronasal plate.
113 citations
TL;DR: A new species of Neoplecostomus is described from corrego Tamborete, municipality of Capitolio, Minas Gerais state, upper rio Parana basin and is distinguished from its congeners by the presence of conspicuous dark spots all over the body.
Abstract: In this study, we describe a new species of Neoplecostomus from corrego Tamborete, municipality of Capitolio, Minas Gerais state, upper rio Parana 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.
113 citations
TL;DR: The new species of Neoplecostomus is known from Córrego Cachoeira a right tributary of the upper Rio Paraná basin and can be distinguished from all congeners by absence of adipose fin or azygous plates on the dorsum surface of the caudal peduncle.
Abstract: In the present study, we describe a new species of Neoplecostomus from central Brazil. The new species is known from Corrego Cachoeira a right tributary of the upper Rio Parana basin. It can be distinguished from all congeners by absence of adipose fin or azygous plates on the dorsum surface of the caudal peduncle. Additionally, the new species differs from N. botucatu and N. paranensis by having a dark caudal fin with a unique v-shaped hyaline vertical area and a larger lower lip. A discussion on the morphological variation of adipose fin among species of Neoplecostomus is also provided.
111 citations
TL;DR: The phylogenetic results revealed the new species as a sister taxon of Gymnotocinclus anosteos within the Otothyrini as well as samples of Nannoplecostomus eleonorae that appeared sister group to all other Neople costomini species.
Abstract: Gymnotocinclus canoeiro n sp of the Hypoptopomatinae is described from small tributaries of the upper rio Tocantins basin It is distinguished from G anosteos by having five characters: (1) the presence of body dermal plates, (2) the pectoral girdle not exposed in ventral view, (3) the pelvic spine longer than pectoral spine in males, (4) the pectoral fin with seven to eight branched rays, and (5) the presence of an adipose fin Furthermore, maximum likelihood (ML) analysis was used to estimate a molecular phylogeny from previously published data of one nuclear (F-Reticulon 4) and three mitochondrial (16S RNA, COI and CytB) genes The phylogenetic results revealed the new species as a sister taxon of Gymnotocinclus anosteos within the Otothyrini We also included samples of Nannoplecostomus eleonorae that appeared sister group to all other Neoplecostomini species, and Plesioptopoma curvidens that appeared within the Neoplecostomini forming a sister clade to all species of Neoplecostomus , except N ribeirensis and the species of Pareiorhina , except P rudolphi
70 citations
TL;DR: It is hypothesize that headwater capture events and marine regressions have shaped the patterns of distribution within the subfamily Neoplecostominae throughout the distinct basins of southeast Brazil.
Abstract: Freshwater fish evolution has been shaped by changes in the earth's surface involving changes in the courses of rivers and fluctuations in sea level. The main objective of this study is to improve our knowledge of the evolution of loricariids, a numerous and adaptive group of freshwater catfish species, and the role of geological changes in their evolution. We use a number of different phylogenetic methods to test the relationships among 52 representative taxa within the Neoplecostominae using 4676 bps of mitochondrial and nuclear DNA. Our analysis revealed that the subfamily Neoplecostominae is monophyletic, including Pseudotocinclus, with three lineages recognized. The first lineage is composed of part of Pareiorhina rudolphi, P. cf. rudolphi, and Pseudotocinclus; the second is composed of Isbrueckerichthys, Pareiorhaphis, Kronichthys, and the species Neoplecostomus ribeirensis; and the third is composed of Pareiorhina carrancas, P. cf. carrancas, Pareiorhina sp. 1, a new genus, and all the species of the genus Neoplecostomus, except N. ribeirensis. The relaxed molecular clock calibration provides a temporal framework for the evolution of the group, which we use for a likelihood-based historical biogeographic analysis to test relevant hypotheses on the formation of southeast Brazil. We hypothesize that headwater capture events and marine regressions have shaped the patterns of distribution within the subfamily Neoplecostominae throughout the distinct basins of southeast Brazil.
38 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 2 |
| 2018 | 1 |
| 2017 | 3 |
| 2016 | 1 |
| 2015 | 1 |
| 2014 | 2 |