Journal article
After eight decades: a new species of Pterobunocephalus (Siluriformes: Aspredinidae) from the upper Putumayo, Napo and Pastaza rivers, Ecuador
Neotropical ichthyology, v 24(1), e250162
01 Apr 2026
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Abstract Pterobunocephalus currently comprises two valid species: P. depressus described from the Guaporé River basin and P. dolichurus from the Trombetas River at its confluence with the Amazon River. A third nominal species, Bunocephalus albofasciatus, described from the upper Mamoré River basin, is presently considered a junior synonym of P. depressus. Based on a morphological approach, we describe here a new species of Pterobunocephalus from the upper Amazon basin (Napo, Pastaza, and Putumayo rivers) in Ecuador. The new species is distinguished from its congeners by the following combination of characters: (1) large eyes; (2) anterior margin of the mesethmoid relatively wide, shallowly concave, and sunken between anterior margins of premaxillae; (3) total number of anal-fin rays 10–11; and (4) in dorsal view, parapophysis of the fifth vertebra shaped like the blade of a shepherd’s axe with distal portion conspicuously and abruptly expanded. Resumo Pterobunocephalus compreende atualmente duas espécies válidas: P. depressus descrito para a bacia do rio Guaporé e P. dolichurus do rio Trombetas em confluência com o rio Amazonas. Uma terceira espécie nominal, Bunocephalus albofasciatus, descrita para a bacia do alto Rio Mamoré, é atualmente considerada sinônimo júnior de P. depressus. Baseado em uma análise morfológica, nós descrevemos aqui uma nova espécie de Pterobunocephalus do alto da bacia Amazônica (rios Napo, Pastaza e Putumayo) no Equador. A nova espécie se distingue de seus congeneres pela seguinte combinação de caracteres: (1) olhos grandes; (2) margem anterior do mesetmóide relativamente larga, superficialmente côncava e afundada entre as margens anteriores dos pré-maxilares; (3) número total de raios da nadadeira anal 10–11; e (4) parapófise da quinta vértebra em forma de lâmina de machado de pastor com porção distal visivelmente expandida.
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Details
- Title
- After eight decades: a new species of Pterobunocephalus (Siluriformes: Aspredinidae) from the upper Putumayo, Napo and Pastaza rivers, Ecuador
- Creators
- Jefferson Luan Crispim (Corresponding Author)Pablo Argüello - National Polytechnic SchoolGabriel de Souza da Costa e Silva - Universidade Estadual Paulista (Unesp)Claudio Oliveira - Universidade Estadual Paulista (Unesp)Kyle R. Luckenbill - Drexel UniversityMark H. Sabaj - Drexel University
- Publication Details
- Neotropical ichthyology, v 24(1), e250162
- Publisher
- Sociedade Brasileira de Ictiologia
- Number of pages
- 21
- Grant note
- Fundacao de Amparo a Pesquisa no Estado de Sao Paulo (FAPESP): 2024/07526-2, 2023/01862-8 James E. Boehlke and Eugenia B. Boehlke Memorial Endowment Fund (ANSP): 2020/13433-6, 306054/2006-0, 441128/2020-3 Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP): 2020/13433-6, NSF-MRI CMMI-2216175 Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq): 306054/2006-0, 441128/2020-3 Pro-Reitoria de Pesquisa da Universidade Estadual Paulista Julio de Mesquita Filho (Prope-UNESP) National Science Foundation Major Research Instrumentation Program: NSF-MRI CMMI-2216175
This research was funded by the Fundacao de Amparo a Pesquisa no Estado de Sao Paulo (FAPESP processes 2024/07526-2 and 2023/01862-8 to JLCR) . This research was also funded by the James E. Boehlke and Eugenia B. Boehlke Memorial Endowment Fund (ANSP) . CO received financial support from Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP grant 2020/13433-6) , Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq proc. 306054/2006-0 and 441128/2020-3) , and Pro-Reitoria de Pesquisa da Universidade Estadual Paulista Julio de Mesquita Filho (Prope-UNESP) . X-ray nanoCT scanner at Drexel University acquired via grant from the National Science Foundation Major Research Instrumentation Program (NSF-MRI CMMI-2216175; PI Antonios Konstos and Antonios Zavaliangos; Senior Personnel MHS) .
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Ichthyology
- Web of Science ID
- WOS:001758500100001
- Scopus ID
- 2-s2.0-105037134903
- Other Identifier
- 991022175073504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Zoology