Peckoltia cavatica, a new loricariid catfish from Guyana and a redescription of P. braueri (Eigenmann 1912) (Siluriformes)

Armbruster, Jonathan W.; Werneke, David C.

doi:10.11646/zootaxa.882.1.1

Cited by 10 publications

(12 citation statements)

References 8 publications

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“…Measured specimens have numbered points inserted into their gill openings. Comparative specimens examined are listed in Armbruster (2003Armbruster ( , 2004 and Armbruster & Werneke (2005) and also include: Baryancistrus longipinnis MCZ 29051, holotype, and MNRJ 19340, 1, and B. niveatus MNHN A-9353, 1, syntypes;MNHN A-9454, syntypes;MNRJ 19344, 12;MCP 28971, 1;MCP 28972, 1;and MCP 28970, 2. Dorsaladipose distance and dorsal-anal distance were excluded from B. demantoides because the dorsal fin is connected to the adipose fin and the measurements are either redundant or impractical.…”

Section: Methodsmentioning

confidence: 99%

“…2004). In general, species of ancistrins that have a sickleshaped opercle, dark or light spots on the body or fins or an entirely dark body, and lack the synapomorphies of the other genera of the Ancistrini are placed in Hemiancistrus and species with dorsal saddles are placed in Peckoltia (Cardoso & Lucinda 2003, Armbruster 2004, Armbruster & Werneke 2005).…”

Section: P R O O F Smentioning

confidence: 99%

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Baryancistrus demantoides and Hemiancistrus subviridis, two new uniquely colored species of catfishes from Venezuela (Siluriformes: Loricariidae)

Werneke

Sabaj²,

Lujan

et al. 2005

Neotrop. ichthyol.

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Baryancistrus demantoides and Hemiancistrus subviridis are two new species of loricariids from southern Venezuela with an olive ground coloration and white to cream-colored or golden-yellow spots. Baryancistrus demantoides is known only from the upper río Orinoco drainage while H. subviridis is also known from the río Casiquiare drainage. In addition to its coloration, B. demantoides can be distinguished from all other ancistrins by having the dorsal and adipose fins connected by an expanded posterior section of the dorsal-fin membrane, golden-yellow spots confined to the anterior portion of the body, and greater than 30 teeth per jaw ramus. Hemiancistrus subviridis can be separated from all other ancistrins by coloration, lacking a connection between the dorsal and adipose fins and having less than 30 teeth per jaw ramus.
Baryancistrus demantoides e Hemiancistrus subviridis são duas espécies novas de loricariídeos do sul da Venezuela, de cor de fundo verde-oliva e manchas brancas a creme ou amarelo-douradas. Baryancistrus demantoides é conhecida somente da bacia do rio Orinoco superior, enquanto H. subviridis é também conhecida da bacia do rio Casiquiare. Além da coloração, B. demantoides pode ser distinguido de todos os outros ancistríneos por ter as nadadeiras dorsal e adiposa conectadas por uma secção posterior expandida da membrana da nadadeira dorsal, manchas amarelo-douradas restritas à porção anterior do corpo, e mais de 30 dentes por ramo mandibular. Hemiancistrus subviridis pode ser separado de todos os outros ancistríneos pela falta de uma conecção entre as nadadeiras dorsal e adiposa e por possuir menos de 30 dentes por ramo mandibular

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Section: Methodsmentioning

confidence: 99%

Section: P R O O F Smentioning

confidence: 99%

Baryancistrus demantoides and Hemiancistrus subviridis, two new uniquely colored species of catfishes from Venezuela (Siluriformes: Loricariidae)

Werneke

Sabaj²,

Lujan

et al. 2005

Neotrop. ichthyol.

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“…Connections between Amazonian and Guianese systems have been reported or hypothesized by different authors as potential regions of exchange. The most well documented is the Rupununi Portal in Guyana, where faunal exchanges between headwaters of the Amazon (Takutu river) and the Essequibo basins (Rupununi river) occur periodically when the Rupununi Savannah floods during the rainy season (Lowe‐McConnell, ; Armbruster and Werneke, ; Hubert and Renno, ; Lujan and Armbruster, ; De Souza et al., ). The Sipaliwini Savannah may connect the Sipaliwini river (Upper Corantijn basin) and the Upper Parú de Oeste river (Amazon basin) when flooded (Nijssen, ).…”

Section: Introductionmentioning

confidence: 99%

Biogeography of the freshwater fishes of the Guianas using a partitioned parsimony analysis of endemicity with reappraisal of ecoregional boundaries

Lemopoulos

Covain

2018

Cladistics

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The Guianas are one of the most diverse regions of the Neotropics, hosting a particularly high rate of freshwater fish endemism. The present distributional patterns of freshwater fish species in the major catchments of the Guianas (comprising Guyana, Suriname and French Guiana) were analysed to reveal the faunal relationships between rivers, evaluate different hypotheses concerning biogeographical units, and redefine the boundaries of the Guianese freshwater ecoregions. A parsimony analysis of endemicity was performed using a data partitioning strategy to alleviate some drawbacks inherent to the method (e.g. long branch attraction artefact, heterotachy), and take into account alternative parsimony models assigning different constraints on state changes for the different species. A strong spatial element was present in the data with a structuring of species along a west-east gradient. Two main biogeographical units were highlighted: one to the west, ranging from the Essequibo to the Commewijne rivers and including the Proto Berbice and Surinamese regions, and one to the east ranging from the Maroni to the Oyapock rivers and including the Western, Central and Eastern French Guiana regions. Each ecoregion possessed distinctive fish assemblages, and three to four potential zones of faunal exchanges between Amazonian and Guianese rivers have been confirmed.

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“…Recent work in the region has allowed for the discovery and description of several new loricariid species (i.e. Armbruster, 2003;Armbruster & Werneke, 2005;Tan & Armbruster, 2016). Lujan et al (2015), in a phylogenetic analysis of Loricariidae focused on Hypostominae, include a specimen of Panaqolus from Guyana.…”

Section: Introductionmentioning

confidence: 99%

A new species of Panaqolus (Siluriformes: Loricariidae) from the rio Branco

2016

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A new species of Panaqolus is described from material from the Takutu River and the mainstem rio Branco. The new species is diagnosed from congeners by its color pattern consisting of dark and light bars on the body, bands on the fins, and with dots and vermiculations absent (vs. no bars in P. albomaculatus, P. nix, P. nocturnus, and P. koko, vs. fins unbanded in P. albomaculatus, P. dentex, P. koko, and P. nix, and vs. dots and vermiculations present in P. albivermis and P. maccus). The new species is diagnosed from barred species of Panaqolus by its specific bar number and orientation and color pattern on its head, with bars oriented in a anteroventral-posterodorsal direction (vs. anterodorsal-posteroventral bars in P. gnomus), having consistently 5 bars (n = 4) on the trunk that do not increase with size (vs. number increasing with size in P. purusiensis and vs. 6-12 in P. changae), and the color pattern on the head of straight lines extending from posterior to the eye to the snout margin, splitting in the middle portion of the line in larger specimens (vs. small, dense reticulate lines in P. changae). Biogeographically, we infer that the new species ancestrally originated in the Amazon river, dispersing to the Takutu River after the Amazon captured part of the Proto-Berbice. Uma espécie nova de Panaqolus é descrita do rio Branco e seu afluente, rio Tacutu. A nova espécie é diagnosticada de suas congêneres pelo padrão de colorido composto por barras escuras e claras alternadas no corpo e nadadeiras, não formando máculas ou vermiculações nas nadadeiras (vs. sem barras no corpo em P. albomaculatus, P. nix, P. nocturnus, e P. koko, e vs. sem barras nas nadadeiras em P. albomaculatus, P. dentex, P. koko, e P. nix, e vs. máculas e vermiculações presentes em P. albivermis e P. maccus). A nova espécie é diagnosticada das espécies de Panaqolus com barras pelo número e orientação das barras e pelo padrão de colorido cefálico, com as barras orientadas posterodorsalmente (vs. posteroventralmente em P. gnomus), pela presença de cinco barras (n = 4) no tronco que não aumentam com o tamanho (vs. número aumentando com o tamanho em P. purusiensis e vs. 6-12 barras em P. changae), e o padrão de colorido cefálico composto por linhas retas da margem posterior do olho à margem do focinho, dividida medianamente em indivíduos maiores (vs. linhas pequenas e vermiculadas em P. changae). Nos inferimos que a nova espécie originou-se ancestralmente no rio Amazonas, dispersando para o rio Tacutu após o Amazonas capturar parte do Proto-Berbice.

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Peckoltia cavatica, a new loricariid catfish from Guyana and a redescription of P. braueri (Eigenmann 1912) (Siluriformes)

Cited by 10 publications

References 8 publications

Baryancistrus demantoides and Hemiancistrus subviridis, two new uniquely colored species of catfishes from Venezuela (Siluriformes: Loricariidae)

Baryancistrus demantoides and Hemiancistrus subviridis, two new uniquely colored species of catfishes from Venezuela (Siluriformes: Loricariidae)

Biogeography of the freshwater fishes of the Guianas using a partitioned parsimony analysis of endemicity with reappraisal of ecoregional boundaries

A new species of Panaqolus (Siluriformes: Loricariidae) from the rio Branco

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