Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon
ABSTRACT Pacus of the genus Myloplus represent a formidable taxonomic challenge, and particularly so for the case of M. asterias and M. rubripinnis, two widespread and common species that harbor considerable morphological diversity. Here we apply DNA barcoding and multiple species discovery methods...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
2020-04-01
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100214&tlng=en |
| _version_ | 1798020078067777536 |
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| author | Rafaela Priscila Ota Valéria Nogueira Machado Marcelo C. Andrade Rupert A. Collins Izeni Pires Farias Tomas Hrbek |
| author_facet | Rafaela Priscila Ota Valéria Nogueira Machado Marcelo C. Andrade Rupert A. Collins Izeni Pires Farias Tomas Hrbek |
| author_sort | Rafaela Priscila Ota |
| collection | DOAJ |
| description | ABSTRACT Pacus of the genus Myloplus represent a formidable taxonomic challenge, and particularly so for the case of M. asterias and M. rubripinnis, two widespread and common species that harbor considerable morphological diversity. Here we apply DNA barcoding and multiple species discovery methods to find candidate species in this complex group. We report on one well-supported lineage that is also morphologically and ecologically distinct. This lineage represents a new species that can be distinguished from congeners by the presence of dark chromatophores on lateral-line scales, which gives the appearance of a black lateral line. It can be further diagnosed by having 25-29 branched dorsal-fin rays (vs. 18-24), 89-114 perforated scales from the supracleithrum to the end of hypural plate (vs. 56-89), and 98-120 total lateral line scales (vs. 59-97). The new species is widely distributed in the Amazon basin, but seems to have a preference for black- and clearwater habitats. This ecological preference and black lateral line color pattern bears a striking similarity to the recently described silver dollar Metynnis melanogrammus. |
| first_indexed | 2024-04-11T16:51:48Z |
| format | Article |
| id | doaj.art-166deb3b75a34a55b199697f81021e87 |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-04-11T16:51:48Z |
| publishDate | 2020-04-01 |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-166deb3b75a34a55b199697f81021e872022-12-22T04:13:25ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02242020-04-0118110.1590/1982-0224-20190112Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian AmazonRafaela Priscila Otahttps://orcid.org/0000-0002-5333-8748Valéria Nogueira Machadohttps://orcid.org/0000-0003-4020-094XMarcelo C. Andradehttps://orcid.org/0000-0002-3573-5774Rupert A. Collinshttps://orcid.org/0000-0002-9135-1169Izeni Pires Fariashttps://orcid.org/0000-0002-1416-4351Tomas Hrbekhttps://orcid.org/0000-0003-3239-7068ABSTRACT Pacus of the genus Myloplus represent a formidable taxonomic challenge, and particularly so for the case of M. asterias and M. rubripinnis, two widespread and common species that harbor considerable morphological diversity. Here we apply DNA barcoding and multiple species discovery methods to find candidate species in this complex group. We report on one well-supported lineage that is also morphologically and ecologically distinct. This lineage represents a new species that can be distinguished from congeners by the presence of dark chromatophores on lateral-line scales, which gives the appearance of a black lateral line. It can be further diagnosed by having 25-29 branched dorsal-fin rays (vs. 18-24), 89-114 perforated scales from the supracleithrum to the end of hypural plate (vs. 56-89), and 98-120 total lateral line scales (vs. 59-97). The new species is widely distributed in the Amazon basin, but seems to have a preference for black- and clearwater habitats. This ecological preference and black lateral line color pattern bears a striking similarity to the recently described silver dollar Metynnis melanogrammus.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100214&tlng=enCOI geneCryptic speciesMyloplus asteriasMyloplus rubripinnisNeotropical |
| spellingShingle | Rafaela Priscila Ota Valéria Nogueira Machado Marcelo C. Andrade Rupert A. Collins Izeni Pires Farias Tomas Hrbek Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon Neotropical Ichthyology COI gene Cryptic species Myloplus asterias Myloplus rubripinnis Neotropical |
| title | Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon |
| title_full | Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon |
| title_fullStr | Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon |
| title_full_unstemmed | Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon |
| title_short | Integrative taxonomy reveals a new species of pacu (Characiformes: Serrasalmidae: Myloplus) from the Brazilian Amazon |
| title_sort | integrative taxonomy reveals a new species of pacu characiformes serrasalmidae myloplus from the brazilian amazon |
| topic | COI gene Cryptic species Myloplus asterias Myloplus rubripinnis Neotropical |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100214&tlng=en |
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