2021
DOI: 10.1590/1982-0224-2020-0106
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Abstract: Two new species from the upper rio Tocantins basin are described in Knodus based on the traditional definition of the genus. The new species are distinguished from other congeners by meristic and morphometric characters, such as the number of cusps in the premaxillary and dentary teeth, the number of scale series between dorsal-fin origin and lateral line, the orbital diameter and the body depth. With the two new species, the number of endemic species in the upper rio Tocantins basin upstream of the mouth of t… Show more

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Cited by 5 publications
(3 citation statements)
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“…Despite recent advances in the understanding of phylogenetic relationships in Stevardiinae using both molecular and morphological data ( e.g ., Ferreira et al ., 2021; García‐Melo et al ., 2019; Mirande, 2019; Thomaz et al ., 2015), a morphological diagnosis of Knodus is not yet available. Thus, new species have been assigned to Knodus following traditional classification, mainly due to the presence of scales on the proximal half of each caudal fin lobe ( e.g ., Deprá et al ., 2021; Menezes & Marinho, 2019; Sousa et al ., 2020), but also by the evidence provided by Thomaz et al . (2015) ( e.g ., Menezes et al ., 2020:8).…”
Section: Discussionmentioning
confidence: 99%
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“…Despite recent advances in the understanding of phylogenetic relationships in Stevardiinae using both molecular and morphological data ( e.g ., Ferreira et al ., 2021; García‐Melo et al ., 2019; Mirande, 2019; Thomaz et al ., 2015), a morphological diagnosis of Knodus is not yet available. Thus, new species have been assigned to Knodus following traditional classification, mainly due to the presence of scales on the proximal half of each caudal fin lobe ( e.g ., Deprá et al ., 2021; Menezes & Marinho, 2019; Sousa et al ., 2020), but also by the evidence provided by Thomaz et al . (2015) ( e.g ., Menezes et al ., 2020:8).…”
Section: Discussionmentioning
confidence: 99%
“…Despite recent advances in the understanding of phylogenetic relationships in Stevardiinae using both molecular and morphological data (e.g.,Ferreira et al, 2021;García-Melo et al, 2019;Mirande, 2019;Thomaz et al, 2015), a morphological diagnosis of Knodus is not yet available. Thus, new species have been assigned to Knodus following traditional classification, mainly due to the presence of scales on the proximal half of each caudal fin lobe (e.g.,Deprá et al, 2021;Menezes & Marinho, 2019;Sousa et al, 2020), but also by the evidence provided byThomaz et al (2015) (e.g.,Menezes et al, 2020:8).Among its congeners, K. borari shares exclusively with K. figueiredoi the presence of only unicuspid or tricuspid teeth in the premaxilla, maxilla and dentary. Nonetheless, they differ from each other by morphometric and meristic characters and colour pattern (see Diagnosis).…”
mentioning
confidence: 96%
“…Comparisons were undertaken directly through examination of specimens, including types, and original descriptions of valid species of Heptapterus. The term 'allomery' is used in the same sense as in Deprá et al (2021). For counts, we considered all free vertebrae; the compound caudal centrum was accounted as a single element and those in Weberian complex were excluded.…”
Section: Morphological Datamentioning
confidence: 99%