Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil

Reis, Roberto E.; Albornoz, Pablo César Lehmann

doi:10.1643/ci-08-150

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…In Niobichthys, and members of the Ancistrinae and Hypostomatinae, there is a pair of nuchal plates in contact in the midline. Species of Acestridium possess 2-4 median unpaired predorsal plates (Reis and Lehman, 2009). Hypoptopoma can also be distinguished from all other loricariids, except the hypoptopomatin genus Oxyropsis, by the shape of the head, which is depressed, and by the ventrolateral placement of the eyes.…”

Section: Scope and Organizationmentioning

confidence: 99%

“…We recognize a total of 15 species of Hypoptopoma, seven of which are newly described herein and two of which were previously assigned to the genus Nannoptopoma Schaefer, 1996a. Following upon the previously published tretaments of Otocinclus (Schaefer, 1997), Acestridium (Reis and Lehman, 2009), and Oxyropsis (Aquino and Schaefer, 2002), this work on Hypoptopoma serves to complete efforts to address the systematics and biogeography of the fishes of the loricariid subfamily Hypoptopomatinae, tribe Hypoptopomatini.…”

Section: Introductionmentioning

confidence: 99%

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Systematics of the Genus Hypoptopoma Günther, 1868 (Siluriformes, Loricariidae)

Aquino

Schaefer

2010

Bulletin of the American Museum of Natural History

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Section: Scope and Organizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Systematics of the Genus Hypoptopoma Günther, 1868 (Siluriformes, Loricariidae)

Aquino

Schaefer

2010

Bulletin of the American Museum of Natural History

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Phylogenetic relationships of the species of Acestridium Haseman, 1911 (Siluriformes: Loricariidae)

2015

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A phylogeny of the species of the loricariid genus Acestridium and relevant outgroups is presented based on a parsimony analysis of 52 unweighted and unordered morphological characters. Acestridium is diagnosed as monophyletic based on the possession of the 17 exclusive synapomorphies. Two primary trees were found, and the strict consensus among those alternative trees resulted in the following relationships: ((A. dichromum + A. triplax)(A. gymnogaster + A. scutatum + (A. discus (A. colombiensis + A. martini)))). Acestridium was found to be sister to Niobichthys with this clade subsequently the sister-group to Oxyropsis + Hypoptopoma.Uma filogenia das espécies do gênero de Loricariidae Acestridium e grupos externos relevantes é apresentada com base na análise de parcimônia de 52 caracteres morfológicos não pesados e desordenados. Acestridium é diagnosticado como monofilético com base na posse de 17 sinapomorfias exclusivas. Duas árvores primárias foram encontradas e o consenso estrito entre essas árvores alternativas resultou nas seguintes relações: ((A. dichromum + A. triplax)(A. gymnogaster + A. scutatum + (A. discus (A. colombiensis + A. martini)))). Acestridium foi encontrado como grupo-irmão de Niobichthys e este clado como grupo-irmão sucessivo de Oxyropsis + Hypoptopoma.

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An appraisal of the phylogenetic relationships of Hypoptopomatini cascudinhos with description of two new genera and three new species (Siluriformes: Loricariidae)

2017

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The discovery of three new taxa of Hypoptotopomatini with ambiguous generic assignment prompted a reanalysis of the phylogenetic relationships of the tribe. The analysis focused on a data matrix of 56 terminals and 107 morphological characters comprising the three new taxa, most species of Hypoptopoma and Otocinclus, and all other species of the tribe. The 162 maximally parsimonious trees of 382 steps, consistency index of 0.41, and retention index of 0.83 were then summarized in a strict consensus tree. The results confirm the monophyly of the Hypoptopomatini, recover four genera as monophyletic (Acestridium, Hypoptopoma, Niobichthys, and Otocinclus), revealed Hypoptopoma and Oxyropsis to be non-monophyletic; and revealed two new genera within Hypoptopomatini. Additionally, Otocinclus was found to be sister to a group with all remaining genera of the tribe; Acestridium and Niobichthys were found to be sister to each other and that clade sister to a group formed by ((Leptotocinclus + Hypoptopoma [part]) + (Nannoxyropsis (Oxyropsis + Hypoptopoma [part]))). Based on this framework, changes to the classification and the taxonomy of the Hypoptopomatini are suggested and the new taxa are described.Keywords: Hypoptopomatinae, Morphology, New genera, Systematics, Taxonomy.A descoberta de três novos táxons pertencentes à Hypoptopomatini com designações genéricas incertas, levaram a uma nova análise das relações filogenéticas da tribo. A análise focou em uma matriz de dados formada por 56 terminais e 107 caracteres morfológicos incluindo os três novos táxons, a maioria das espécies de Hypoptopoma e Otocinclus, e todas as demais espécies da tribo. As 162 árvores maximamente parcimoniosas com 382 passos, índice de consistência 0.41 e índice de retenção 0.83 foram sumarizadas em um consenso estrito. O resultado obtido corrobora o monofiletismo de Hypoptopomatini, recupera quatro gêneros como grupos monofiléticos (Acestridium, Hypoptopoma, Niobichthys, e Otocinclus), aponta Hypoptopoma e Oxyropsis como grupos não-monofiléticos e revela dois novos gêneros pertencentes à Hypoptopomatini. Adicionalmente, Otocinclus foi encontrado como sendo grupo-irmão de um clado formado por todos os demais gêneros da tribo e Acestridium e Niobichthys formam um grupo-irmão mais relacionado a um clado formado por dois grupos monofiléticos ((Leptotocinclus + Hypoptopoma [parte]) + (Nannoxyropsis (Oxyropsis + Hypoptopoma [parte]))). Com base neste cenário, sugere-se mudanças na classificação e na taxonomia de Hypoptopomatini e os novos táxons são descritos.

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Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil

Cited by 3 publications

References 3 publications

Systematics of the Genus Hypoptopoma Günther, 1868 (Siluriformes, Loricariidae)

Systematics of the Genus Hypoptopoma Günther, 1868 (Siluriformes, Loricariidae)

Phylogenetic relationships of the species of Acestridium Haseman, 1911 (Siluriformes: Loricariidae)

An appraisal of the phylogenetic relationships of Hypoptopomatini cascudinhos with description of two new genera and three new species (Siluriformes: Loricariidae)

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