A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes.
Knodus nuptialis n. sp. is described from the Rio Curuá drainage, Rio Xingu basin, Brazil. It can be diagnosed from its congeners by having dentary teeth decreasing gradually in size posteriorly, outer premaxillary teeth row with five cusps, 12-15 branched anal-fin rays and a single humeral spot. Th...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2019-01-01
|
| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0217915 |
| _version_ | 1797660721252663296 |
|---|---|
| author | Naércio A Menezes Manoela M F Marinho |
| author_facet | Naércio A Menezes Manoela M F Marinho |
| author_sort | Naércio A Menezes |
| collection | DOAJ |
| description | Knodus nuptialis n. sp. is described from the Rio Curuá drainage, Rio Xingu basin, Brazil. It can be diagnosed from its congeners by having dentary teeth decreasing gradually in size posteriorly, outer premaxillary teeth row with five cusps, 12-15 branched anal-fin rays and a single humeral spot. The species presents notable sexual dimorphism consisting of densely concentrated nuptial tubercles on head, body, and fins, gill-gland, and bony hooks in the anal fin of mature males. It was found that these sexually dimorphic features are useful and functional in males of the new species only during the reproductive season and after this period, they become atrophied, and eventually disappear. The list of characiform species presenting breeding tubercles is updated and nine species and two genera of the Characidae, Deuterodon and Bryconacidnus, are for the first time reported to have breeding tubercles. |
| first_indexed | 2024-03-11T18:35:03Z |
| format | Article |
| id | doaj.art-8451595d2f5246d2a7c38919a38897b7 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-03-11T18:35:03Z |
| publishDate | 2019-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-8451595d2f5246d2a7c38919a38897b72023-10-13T05:31:41ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01147e021791510.1371/journal.pone.0217915A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes.Naércio A MenezesManoela M F MarinhoKnodus nuptialis n. sp. is described from the Rio Curuá drainage, Rio Xingu basin, Brazil. It can be diagnosed from its congeners by having dentary teeth decreasing gradually in size posteriorly, outer premaxillary teeth row with five cusps, 12-15 branched anal-fin rays and a single humeral spot. The species presents notable sexual dimorphism consisting of densely concentrated nuptial tubercles on head, body, and fins, gill-gland, and bony hooks in the anal fin of mature males. It was found that these sexually dimorphic features are useful and functional in males of the new species only during the reproductive season and after this period, they become atrophied, and eventually disappear. The list of characiform species presenting breeding tubercles is updated and nine species and two genera of the Characidae, Deuterodon and Bryconacidnus, are for the first time reported to have breeding tubercles.https://doi.org/10.1371/journal.pone.0217915 |
| spellingShingle | Naércio A Menezes Manoela M F Marinho A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. PLoS ONE |
| title | A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. |
| title_full | A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. |
| title_fullStr | A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. |
| title_full_unstemmed | A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. |
| title_short | A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes. |
| title_sort | new species of knodus eigenmann characiformes characidae stevardiinae with comments on nuptial tubercles and gill gland in characiform fishes |
| url | https://doi.org/10.1371/journal.pone.0217915 |
| work_keys_str_mv | AT naercioamenezes anewspeciesofknoduseigenmanncharaciformescharacidaestevardiinaewithcommentsonnuptialtuberclesandgillglandincharaciformfishes AT manoelamfmarinho anewspeciesofknoduseigenmanncharaciformescharacidaestevardiinaewithcommentsonnuptialtuberclesandgillglandincharaciformfishes AT naercioamenezes newspeciesofknoduseigenmanncharaciformescharacidaestevardiinaewithcommentsonnuptialtuberclesandgillglandincharaciformfishes AT manoelamfmarinho newspeciesofknoduseigenmanncharaciformescharacidaestevardiinaewithcommentsonnuptialtuberclesandgillglandincharaciformfishes |