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Old 06-01-18, 18:57
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An integrative framework to reevaluate the Neotropical catfish genus Guyanancistrus..

"An integrative framework to reevaluate the Neotropical catfish genus Guyanancistrus (Siluriformes: Loricariidae) with particular emphasis on the Guyanancistrus brevispinis complex"


Sonia Fisch-Muller, Jan H. A. Mol, RaphaŽl Covain

Quote:
Abstract
Characterizing and naming species becomes more and more challenging due to the increasing difficulty of accurately delineating specific bounderies. In this context, integrative taxonomy aims to delimit taxonomic units by leveraging the complementarity of multiple data sources (geography, morphology, genetics, etc.). However, while the theoretical framework of integrative taxonomy has been explicitly stated, methods for the simultaneous analysis of multiple data sets are poorly developed and in many cases different information sources are still explored successively. Multi-table methods developed in the field of community ecology provide such an intregrative framework. In particular, multiple co-inertia analysis is flexible enough to allow the integration of morphological, distributional, and genetic data in the same analysis. We have applied this powerfull approach to delimit species boundaries in a group of poorly differentiated catfishes belonging to the genus Guyanancistrus from the Guianas region of northeastern South America. Because the species G. brevispinis has been claimed to be a species complex consisting of five species, particular attention was paid to taxon. Separate analyses indicated the presence of eight distinct species of Guyanancistrus, including five new species and one new genus. However, none of the preliminary analyses revealed different lineages within G. brevispinis, and the multi-table analysis revealed three intraspecific lineages. After taxonomic clarifications and description of the new genus, species and subspecies, a reappraisal of the biogeography of Guyanancistrus members was performed. This analysis revealed three distinct dispersals from the Upper reaches of Amazonian tributaries toward coastal rivers of the Eastern Guianas Ecoregion. The central role played by the Maroni River, as gateway from the Amazon basin, was confirmed. The Maroni River was also found to be a center of speciation for Guyanancistrus (with three species and two subspecies), as well as a source of dispersal of G. brevispinis toward the other main basins of the Eastern Guianas.
Published: PLoS ONE 13(1)

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Old 06-01-18, 19:46
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Hi,

That is a very extensive and interesting work.

New in the database:

Genus Cryptancistrus

with type specie

Cryptancistrus similis

New in the genus Guyanancistrus

Guyanancistrus brownsbergensis

Guyanancistrus megastictus

Guyanancistrus nassauensis

Guyanancistrus tenuis

Guyanancistrus teretirostris


Changed in the database:

There are also very extensive investigations in the specie Guyanancistrus brevispinis. As result there are three subespecies:

Guyanancistrus brevispinis brevispinis (brevispinis brevispinis -because, it's the specie initial)

Guyanancistrus brevispinis bifax

Guyanancistrus brevispinis orientalis (the easternmost subespecie, from French Guiana. L 41 y LDA 43 belong in this subspecie.)

Greetings
Elko
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