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Microglanis oliveirai Ruiz & Shibatta, 2011

Image contributors to this species:

Steven Grant (3) Mark Henry Sabaj (1)

ScotCat Sources:

Other Sources:

Relevant Information:

Very similar to M. poecilus but the lateral line is shorter. Small species. Specimens collected at the Rio Cristalino basin have larger interorbital width and possess an overall darker colouration when compared with specimens of the Rio das Mortes basin. Description: Readily distinguished from all congeners in the possession of the following characters: short lateral line, reaching only the vertical line through base of dorsal-fin spine; 3-6 lateral line pores; 3-6 gill rakers in the first branchial arch; 10-11 branched caudal fin rays; 5 pleural ribs; 27-28 free vertebrae; large anterior fontanel; small supraoccipital process not contacting anterior nuchal plate; small nuchal shield. Colouration: Ground colour light brown. Ventral region of body and head pale with brown spots. Head dark brown, with lateral portions of head, margin of opercle, anterior and posterior nostrils, and pores of cephalic canals light colored. Wide, irregular light band passing through nape and anterior portion of trunk, immediately after opercular opening. Upper lip dark, lower lip light. Light barbels speckled with dark brown spots. Etymology: The specific name oliveirai: Named in honour of Claudio de Oliveira, from the Universidade Estadual Paulista “Júlio de Mesquita Filho”, campus Botucatu (SP), in recognition of his extensive contribution to the knowledge of
Neotropical fish evolution.

Common Name:

None

Synonyms:

None

Family:

Pseudopimelodidae

Distribution:

South America: From tributaries of Rio das Mortes and Rio Cristalino, upper-middle rio Araguaia basin, State of Mato Grosso. Type Locality: Brazil, Mato Grosso, Barra do Garças, Vale dos Sonhos District, BR-158 road, km 750, rio Corrente (right margin tributary of the rio das Mortes), rio Araguaia basin, 15°29’56.3”S 52°12’10.8”W, 31 Jul 2008.

Size:

2.6cm. (1ins)

Temp:

21 -25°C (69-77°F)

p.H.

6.0-7.5.

IUCN Red List

Microglanis oliveirai is endemic to Brazil and is known only from descriptive work for the Rio das Mortes and Rio Cristalino, both tributaries of the Araguaia River, in the state of Mato Grosso. Individuals of this species were collected in small rivers with muddy bottoms. Despite being reasonably abundant, M. oliveirai is cryptobiotic and difficult to collect, requiring targeted collection and hindering knowledge of its true geographic distribution. The only recorded location of the species is situated in the area near the site of the Couto Magalhães hydroelectric power plant (UHE), Araguaia, Brazil. Due to uncertainties regarding the species' true geographic distribution, and the fact that the only recorded area is likely under the influence of the aforementioned UHE construction, it is difficult to measure the degree of threat and assess its conservation status. Therefore, Microglanis oliveirai was categorised as Data Deficient (DD), (IUCN 2022).

Reference:

Chico Mendes Institute for Biodiversity Conservation (ICMBio). 2022. Microglanis oliveirai. The IUCN Red List of Threatened Species 2022.
Grant, Steven; pers comm. Dec. 2011.
W. B. G. Ruiz & O. A. Shibatta; Two new species of Microglanis (Siluriformes: Pseudopimelodidae) from the upper-middle rio Araguaia basin, Central Brazil. Neotropical Ichthyology, 9(4): 697-707, 201.

Family: Pseudopimelodidae Back to Ident-A-Cat Click on Thumbnails

Microglanis oliveirai

Microglanis oliveirai
Dorsal view

Microglanis oliveirai

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