Description of a New, Narrowly Endemic South American Darter (Characiformes: Crenuchidae) from the Central Guiana Shield Highlands of Guyana

Lujan, Nathan K.; Agudelo-Zamora, Henry D.; Taphorn, Donald C.; Booth, Pieter N.; López‐Fernández, Hernán

doi:10.1643/ci-12-079

Cited by 13 publications

(16 citation statements)

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“…The distinctiveness of upland and lowland populations reflects a pattern of endemicity that has been reported from the Pakaraima Mountains and associated upland areas. In fishes, there are several species endemic to upland rivers of the Guianas, including members of the families Hypopomidae, Cichlidae and Loricariidae, as well as four families of Characiformes (Armbruster & Taphorn, ; Gery & Zarske, ; López‐Fernández, Taphorn, & Liverpool, ; Lujan, ; Lujan, Agudelo‐Zamora, Taphorn, Booth, & López‐Fernández, ; Maldonado‐Ocampo et al., ; Taphorn, Lopez‐Fernandez, & Bernard, ). Although the antiquity of these endemic species is not well known, some may date to the Oligocene or earlier (López‐Fernández, Arbour, Winemiller, & Honeycutt, ; Lujan & Armbruster, ), indicating a very long period of isolation.…”

Section: Discussionmentioning

confidence: 99%

Fish biogeography in the “Lost World” of the Guiana Shield: Phylogeography of the weakly electric knifefish Gymnotus carapo (Teleostei: Gymnotidae)

Lehmberg

Elbassiouny

Bloom

et al. 2018

Journal of Biogeography

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Aim The Guiana Shield region exhibits extraordinary topography that includes sheer, flat‐topped mountains (tepuis) atop an upland platform. Rivers of the eastern Pakaraima Mountains descend to Atlantic coastal lowlands, often traversing spectacular rapids and waterfalls. For fish species distributed in both uplands and lowlands, it is unclear whether these rapids and waterfalls present population or biogeographical boundaries. We sought to test this using the geographically widespread banded‐electric knifefish (Gymnotus carapo) as a model. Location The Guiana Shield region of South America. Methods We sampled 60 Gymnotus carapo specimens from the Guiana Shield region, and 75 G. carapo and closely related species from other parts of South America. We sequenced the mitochondrial cytochrome b gene and an intron from the nuclear S7 ribosomal protein gene, and used maximum likelihood and Bayesian tree‐building approaches to generate phylogenetic trees of haplotypes. Results Haplotype sharing is minimal between populations separated by elevational barriers. We found evidence for two main haplotype clades in the Guiana Shield: one distributed in Atlantic coastal regions that includes most lowland samples, and one inland that includes most upland samples. Inland Guiana samples are more closely related to samples from the Amazon basin than to those of Atlantic coastal regions. A single sample from Tafelberg tepui in Suriname was most closely related to the Atlantic coastal lineages. Main conclusions Riverine barriers that result from steep elevational gradients in the Guiana Shield inhibit gene flow between uplands and lowlands, even for a widely distributed species. Biogeographical relationships of Guiana Shield G. carapo are complex, with most upland lineages showing affinities to the Amazon basin, rather than to nearby lowland drainages of the Atlantic coast.

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Section: Discussionmentioning

confidence: 99%

Fish biogeography in the “Lost World” of the Guiana Shield: Phylogeography of the weakly electric knifefish Gymnotus carapo (Teleostei: Gymnotidae)

Lehmberg

Elbassiouny

Bloom

et al. 2018

Journal of Biogeography

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“…gomesi, and C. purpuratum. Later, the following five species were hy pothesized as members of clade C1, C. alipioi, C. amaila, C. japuhybense, C. kamakan, and C. timbuiense (Travassos, 1946(Travassos, , 1955bBuckup & Reis, 1997;Lujan et al, 2013;Zanata & Camelier, 2015). Five additional species of Characidium also have unscaled isthmus and are putative members of Clade C1: C. grajahuense, C. helmeri, C. macrolepidotus Peters, 1868, C. pterostictum, and C. vidali (Travassos, 1944(Travassos, , 1967Gomes, 1947;.…”

Section: Discussionmentioning

confidence: 99%

“…Characidium travassosi is a member of Clade C1 (Buckup, 1993b), which can be diagnosed from its congeners, except C. alipioi, C. amaila Lujan, AgudeloZamora, Taphorn, Booth & López-Fernández, 2013, C. boavistae Steindachner, 1915, C. bolivianum Pearson, 1924C. crandellii Steindachner, 1915;C.…”

Section: Diagnosismentioning

confidence: 99%

A new species of Characidium Reinhardt, 1867 (Characiformes: Crenuchidae) endemic to the Atlantic Forest in Paraná State, southern Brazil

2016

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A new species of Characidium is described based on specimens obtained from the highland streams of the Serra do Mar, Atlantic Forest Biome, in Paraná State, Southern Brazil. The new species is possibly a member member of the C. lauroi group, which is diagnosed by having the isthmus unscaled, bars poorly marked, and spots on sides of body, and is composed by four additional species: C. japuhybense; C. lauroi; C. oiticicai; and C. schubarti. The new species differs from its congeners with naked isthmus, except C. helmeri, by having 15-18 principal caudal-fin rays; and 10-12 pectoral-fin rays; and from C. helmeri, by having a slender body, tip of pectoral fin not reaching origin of pelvic fin, tip of pelvic fin not reaching beyond anus, supraorbital present and well developed, and by lacking vertically elongated dashes on sides of body. The new species is known from tributaries of the rio Jordão, in the rio Iguaçu Basin, and rio Taquari, a tributary of the rio Ribeira de Iguape coastal drainage.Uma nova espécie de Characidium é descrita com base em exemplares obtidos de riachos de altitude da Serra do Mar, no bioma Mata Atlântica, do Estado do Paraná, Sul do Brasil. A nova espécie é possivelmente um membro do grupo C. lauroi, que pode ser diagnosticado por possuir o istmo sem escamas, barras pouco marcadas e pontos nos lados do corpo, e é composto por quatro espécies adicionais: C. japuhybense; C. lauroi; C. oiticicai; e C. schubarti. A nova espécie difere de seus congêneres com istmo nú, exceto C. helmeri, por possuir 15-18 raios principais na nadadeira caudal, e 10-12 raios na nadadeira peitoral; e de C. helmeri, por possuir o corpo mais alongado, pela ponta da nadadeira peitoral não alcançar a nadadeira pélvica, pela ponta da nadadeira pélvica não alcançar o ânus, pelo supraorbital presente e bem desenvolvido, e pela ausência de manchas verticalmente alongadas na porção ventral do corpo. A nova espécie é conhecida de duas drenagens, nos tributários do rio Jordão, na bacia do rio Iguaçu, e no rio Taquari, um tributário da bacia costeira do rio Ribeira de Iguape.

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“…Half of these species were described before 1950 and about 15 species were described after the year 2000 (e.g., Melo & Buckup, 2002;Taphorn et al, 2006;Silveira et al, 2008;Lujan et al, 2013;Peixoto & Wosiacki, 2013;Leitão & Buckup, 2014;Zanata & Camelier, 2014), indicating recent efforts to increase the taxonomic knowledge of the genus. Characidium is currently considered a monophyletic group based on the presence of a black spot near the base of the middle caudal-fin rays (Buckup, 1993a).…”

Section: Introductionmentioning

confidence: 99%

Two new species of Characidium Reinhardt (Characiformes: Crenuchidae) from northeastern Brazilian coastal drainages

Zanata

Camelier

2015

Neotrop. ichthyol.

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Two new species of Characidium, one from the rio Pardo basin, and another from the rio Paraguaçu basin, Bahia, Brazil, are described. The first new species is distinguished from its congeners by having conspicuous black vertical traces on body, formed by the concentration of melanophores along posterior margin of scales. The species further differs from most congeners by the presence of a conspicuous 3-shaped black blotch on the caudal fin and isthmus not covered by scales. The other new species is distinguished from congeners by having irregular dark blotches on dorsum alternating elongation to one or the other side of body, usually not connected to lateral blotches. The species can be further characterized by the absence of conspicuous blotches or bars on fins and the presence of secondary sexual dimorphism, such as pelvic fins of mature males longer than in females and with bony hooks. Duas novas espécies de Characidium, uma da bacia do rio Pardo e outra da bacia do rio Paraguaçu, Bahia, Brasil, são descritas. A primeira espécie nova distingue-se das congêneres por ter traços verticais pretos e conspícuos nas laterais do corpo, formados pela concentração de melanóforos ao longo da margem posterior das escamas. A espécie difere ainda da maioria das congêneres pela presença de faixa preta conspícua em forma de 3 na nadadeira caudal e istmo não coberto por escamas. A outra espécie nova se distingue das congêneres por ter manchas dorsais irregulares alternando alongamento para um ou outro lado do corpo, a maioria não conectada às manchas laterais. A espécie pode ser ainda caracterizada pela ausência de manchas ou barras conspícuas nas nadadeiras e pela presença de dimorfismo sexual secundário, tais como nadadeiras pélvicas dos machos maduros mais longas que em fêmeas e com espinhos ósseos.

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Description of a New, Narrowly Endemic South American Darter (Characiformes: Crenuchidae) from the Central Guiana Shield Highlands of Guyana

Cited by 13 publications

References 13 publications

Fish biogeography in the “Lost World” of the Guiana Shield: Phylogeography of the weakly electric knifefish Gymnotus carapo (Teleostei: Gymnotidae)

Fish biogeography in the “Lost World” of the Guiana Shield: Phylogeography of the weakly electric knifefish Gymnotus carapo (Teleostei: Gymnotidae)

A new species of Characidium Reinhardt, 1867 (Characiformes: Crenuchidae) endemic to the Atlantic Forest in Paraná State, southern Brazil

Two new species of Characidium Reinhardt (Characiformes: Crenuchidae) from northeastern Brazilian coastal drainages

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