{"title":"南美小眼鲶鱼属的修正及亚马逊河流域和奥里诺科河流域两新种的描述","authors":"M. W. Littmann, J. Lundberg, Marcelo Salles Rocha","doi":"10.1635/053.167.0112","DOIUrl":null,"url":null,"abstract":"ABSTRACT. The pimelodid genus Hypophthalmus is a small group of pelagic and planktivorous catfishes that are abundant and variously distributed in the lowland river basins of the Amazon, Parnaíba, Orinoco, Guianas and Paraná. Since their earliest published descriptions, commencing over 190 years ago with H. edentatus Spix and Agassiz 1829, the taxonomy and nomenclature of Hypophthalmus species have been confused and unresolved. In this study, four of the six available species names are validated and two new species are described. Newly discovered characters of the vertebral column, circumoral barbels, pelvic fins, and lateralis sensory canals provide strong support and diagnostics for species and species-groups. A key to species, anatomical descriptions, notes on identification of small juveniles and phylogenetic interrelationships are included. A lectotype is designated for Hypophthalmus marginatus and nominal Hypophthalmus longifilis, respectively.","PeriodicalId":54579,"journal":{"name":"Proceedings of the Academy of Natural Sciences of Philadelphia","volume":"167 1","pages":"171 - 223"},"PeriodicalIF":0.5000,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Revision of the South American catfish genus Hypophthalmus (Siluriformes, Pimelodidae) with descriptions of two new species from the Amazon and Orinoco Basins\",\"authors\":\"M. W. Littmann, J. Lundberg, Marcelo Salles Rocha\",\"doi\":\"10.1635/053.167.0112\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"ABSTRACT. The pimelodid genus Hypophthalmus is a small group of pelagic and planktivorous catfishes that are abundant and variously distributed in the lowland river basins of the Amazon, Parnaíba, Orinoco, Guianas and Paraná. Since their earliest published descriptions, commencing over 190 years ago with H. edentatus Spix and Agassiz 1829, the taxonomy and nomenclature of Hypophthalmus species have been confused and unresolved. In this study, four of the six available species names are validated and two new species are described. Newly discovered characters of the vertebral column, circumoral barbels, pelvic fins, and lateralis sensory canals provide strong support and diagnostics for species and species-groups. A key to species, anatomical descriptions, notes on identification of small juveniles and phylogenetic interrelationships are included. A lectotype is designated for Hypophthalmus marginatus and nominal Hypophthalmus longifilis, respectively.\",\"PeriodicalId\":54579,\"journal\":{\"name\":\"Proceedings of the Academy of Natural Sciences of Philadelphia\",\"volume\":\"167 1\",\"pages\":\"171 - 223\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2021-07-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the Academy of Natural Sciences of Philadelphia\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1635/053.167.0112\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"BIODIVERSITY CONSERVATION\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Academy of Natural Sciences of Philadelphia","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1635/053.167.0112","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIODIVERSITY CONSERVATION","Score":null,"Total":0}
Revision of the South American catfish genus Hypophthalmus (Siluriformes, Pimelodidae) with descriptions of two new species from the Amazon and Orinoco Basins
ABSTRACT. The pimelodid genus Hypophthalmus is a small group of pelagic and planktivorous catfishes that are abundant and variously distributed in the lowland river basins of the Amazon, Parnaíba, Orinoco, Guianas and Paraná. Since their earliest published descriptions, commencing over 190 years ago with H. edentatus Spix and Agassiz 1829, the taxonomy and nomenclature of Hypophthalmus species have been confused and unresolved. In this study, four of the six available species names are validated and two new species are described. Newly discovered characters of the vertebral column, circumoral barbels, pelvic fins, and lateralis sensory canals provide strong support and diagnostics for species and species-groups. A key to species, anatomical descriptions, notes on identification of small juveniles and phylogenetic interrelationships are included. A lectotype is designated for Hypophthalmus marginatus and nominal Hypophthalmus longifilis, respectively.
期刊介绍:
The Proceedings (ISSN 0097-3157) has been published continuously since 1841. Many volumes are still available in their original printings. Early volumes are unbound, constituting two or three issues per year. Quantities of some volumes may be limited. Early volumes may have slightly soiled cover sheets, but the text blocks are perfect.