Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes
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...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
2021-03-01
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100208&tlng=en |
| _version_ | 1798021612377735168 |
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| author | Gabriel de Carvalho Deprá Renata Rúbia Ota Oscar Barroso Vitorino Júnior Katiane Mara Ferreira |
| author_facet | Gabriel de Carvalho Deprá Renata Rúbia Ota Oscar Barroso Vitorino Júnior Katiane Mara Ferreira |
| author_sort | Gabriel de Carvalho Deprá |
| collection | DOAJ |
| description | 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 the rio Paranã, rises to 53 (89 to the confluence with rio Araguaia). The existence of a meristic character that changes through ontogeny (allomery), viz. the number of scale series between dorsal-fin origin and lateral line, was detected in some species of Knodus through a regression analysis. Additionally, this paper describes an unambiguous, more informative and precise new method for counting vertebrae, which will enhance the efficacy of this trait in species comparisons. |
| first_indexed | 2024-04-11T17:16:27Z |
| format | Article |
| id | doaj.art-f8fc618e41374dcb80667d92104cf96c |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-04-11T17:16:27Z |
| publishDate | 2021-03-01 |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-f8fc618e41374dcb80667d92104cf96c2022-12-22T04:12:38ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02242021-03-0119110.1590/1982-0224-2020-0106Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changesGabriel de Carvalho Depráhttps://orcid.org/0000-0002-5520-9763Renata Rúbia Otahttps://orcid.org/0000-0002-5743-2758Oscar Barroso Vitorino Júniorhttps://orcid.org/0000-0002-4783-4403Katiane Mara Ferreirahttps://orcid.org/0000-0002-8793-7343ABSTRACT 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 the rio Paranã, rises to 53 (89 to the confluence with rio Araguaia). The existence of a meristic character that changes through ontogeny (allomery), viz. the number of scale series between dorsal-fin origin and lateral line, was detected in some species of Knodus through a regression analysis. Additionally, this paper describes an unambiguous, more informative and precise new method for counting vertebrae, which will enhance the efficacy of this trait in species comparisons.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100208&tlng=enAllochromyAllomeryEndemismKnodus brevicepsSecondary sexual characters |
| spellingShingle | Gabriel de Carvalho Deprá Renata Rúbia Ota Oscar Barroso Vitorino Júnior Katiane Mara Ferreira Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes Neotropical Ichthyology Allochromy Allomery Endemism Knodus breviceps Secondary sexual characters |
| title | Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes |
| title_full | Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes |
| title_fullStr | Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes |
| title_full_unstemmed | Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes |
| title_short | Two new species of Knodus (Characidae: Stevardiinae) from the upper rio Tocantins basin, with evidence of ontogenetic meristic changes |
| title_sort | two new species of knodus characidae stevardiinae from the upper rio tocantins basin with evidence of ontogenetic meristic changes |
| topic | Allochromy Allomery Endemism Knodus breviceps Secondary sexual characters |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100208&tlng=en |
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