Journal article
Ossancora, New Genus of Thorny Catfish (Teleostei: Siluriformes: Doradidae) with Description of One New Species
Proceedings of the Academy of Natural Sciences of Philadelphia, v 161(1), pp 117-152
Oct 2011
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Abstract
Ossancora, new genus, is diagnosed within Doradidae by having the unique combination of posterior coracoid process approximately as long as posterior cleithral process in adults, posterior cranial fontanel occluded, long maxillary barbel with smooth elongate fimbriae, and teeth present on dentary and premaxilla. A similarly long posterior coracoid process is found in only one other doradid species, Trachydoras paraguayensis, which is distinguished, as are its congeners, from Ossancora by having a small posterior cranial fontanel retained in adults, a relatively short maxillary barbel with stout fimbriae, and edentulous jaws. Three nominal species are recognized as valid and redescribed in Ossancora: Doras punctatusKner 1853, in both the Amazonas and Paraná-Paraguay basins, Oxydoras eigenmanniBoulenger 1895, in the Paraguay basin, and Doras fimbriatusKner 1855 in the Amazonas basin. The younger name Doras fimbriatusKner 1855 is considered valid as a nomen protectum according to Article 23.9 of the ICZN, and its older synonym, D. loricatusKner 1853 qualifies as a nomen oblitum. A fourth new species, Ossancora asterophysa, is described and diagnosed in part by a gas bladder morphology that is distinctive among congeners. Three species, O. eigenmanni, O. fimbriata and O. asterophysa, form a monophyletic group based on three shared characteristics: smooth elongate fimbriae inserted in more than one row, one dorsally and one ventrally, along anterior margin of maxillary barbel (uniquely derived among Doradidae), elongate fimbriae on mental barbels, and anterior nuchal plate reduced, not sutured to epioccipital (latter two features uniquely derived among Ossancora). Ossancora is typical of lowland floodplain lakes and river channels, and its occurrence in the both the Amazonas and Paraná-Paraguay supports a historical link between these two basins. A key to species and detailed anatomical descriptions are provided. Type specimens are discussed and lectotypes are newly designated for Oxydoras eigenmanniBoulenger 1895, D. fimbriatusKner 1855, and Doras (Corydoras) punctatusKner 1853, respectively.
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Details
- Title
- Ossancora, New Genus of Thorny Catfish (Teleostei: Siluriformes: Doradidae) with Description of One New Species
- Creators
- José L. O Birindelli - Universidade de São PauloMark H. Sabaj Pérez - Drexel University
- Publication Details
- Proceedings of the Academy of Natural Sciences of Philadelphia, v 161(1), pp 117-152
- Publisher
- Academy of Natural Sciences of Philadelphia
- Number of pages
- 36
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Academy of Natural Sciences of Drexel University
- Web of Science ID
- WOS:000208770400009
- Scopus ID
- 2-s2.0-84856626099
- Other Identifier
- 991019330801704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Biodiversity Conservation
- Ecology