Results 41 to 50 of about 6,260 (178)

Osteología de Astyanax aurocaudatus (Pisces: characidae) del río Roble, Alto Cauca, Colombia. [PDF]

, 2004
Sobre Astyanax aurocaudatus, no existe información osteológica que contribuya a interpretar correctamente su situación taxonómica. En este trabajo se realizaron observaciones osteológicas, en cuatro ejemplares diafanizados: dos machos y dos hembras ...
Ruiz Calderón, Raquel Ivveth
core   +1 more source

Quantitative genetic analysis of retinal degeneration in the blind cavefish Astyanax mexicanus. [PDF]

PLoS ONE, 2013
The retina is the light-sensitive tissue of the eye that facilitates vision. Mutations within genes affecting eye development and retinal function cause a host of degenerative visual diseases, including retinitis pigmentosa and anophthalmia ...
Kelly E O'Quin, Masato Yoshizawa, Pooja Doshi, William R Jeffery   +3 more
doaj   +1 more source

Fish Assemblages in an Urbanized Neotropical Basin: Influence of Environmental Factors Across Dry and Rainy Periods

International Review of Hydrobiology, Volume 111, Issue 2, December 2026.
ABSTRACT This study investigated the effects of season and environmental disturbances on fish communities in neotropical rivers of the Sorocaba basin, a Sub‐Basin of the Paraná River in Southeast Brazil, based on sampling 1196 individuals from 49 species, including two non‐native and one threatened with extinction.
Natalia S. Alves, Daiane E. Cavallari, Welber S. Smith   +2 more
wiley   +1 more source

Astyanax troya

, 2006
Astyanax troya: MACN-Ict 8310, holotype, 73.8 mm, Argentina, Misiones, arroyo Cuñapirú Chico.Published as part of J. M. Mirande, G. Aguilera & M. D. L. M.
M. D. L. M. Azpelicueta, G. Aguilera, J. M. Mirande   +2 more
core   +1 more source

Comparative cytogenetics in Astyanax (Characiformes: Characidae) with focus on the cytotaxonomy of the group

Neotropical Ichthyology
Astyanax is a diverse group of Neotropical fishes, whose different forms occupy different environments. This great diversity is also reflected on cytogenetic aspects and molecular markers, which have repeatedly been demonstrated by cytogenetic studies ...
Renata Cristina Claudino de Oliveira Tenório, Carla de Andrade Vitorino, Issakar Lima Souza, Claudio Oliveira, Paulo Cesar Venere   +4 more
doaj   +1 more source

Loss, persistence and reversal of phenotypic traits

Biological Reviews, Volume 101, Issue 5, Page 2119-2133, October 2026.
ABSTRACT The irreversibility of complex trait loss has long been a tenet of evolutionary biology. However, this idea is increasingly at odds with the numerous documented exceptions across the Tree of Life. We synthesise this growing body of evidence across a diverse array of taxa and traits, exploring the evolutionary conditions that enable ...
Giobbe Forni, Giuseppe Fusco, Filippo Nicolini, Heather Bruce, Andrea Luchetti   +4 more
wiley   +1 more source

Cytogenetic divergence in two sympatric fish species of the genus Astyanax Baird and Girard, 1854 (Characiformes, Characidae) from northeastern Brazil

Genetics and Molecular Biology, 2012
The fish genus Astyanax is widespread throughout the Neotropical region and is one of the most species-rich genera of the Characiformes. Cytogenetic studies of Astyanax have revealed marked intra-and interspecific diversity, with the identification of ...
Aline Souza Medrado, Mavione Souza Ribeiro, Paulo Roberto Antunes de Mello Affonso, Paulo Luíz Souza Carneiro, Marco Antônio Costa   +4 more
doaj  

Evolutionary history of the fish genus Astyanax Baird & Girard (1854) (Actinopterygii, Characidae) in Mesoamerica reveals multiple morphological homoplasies

BMC Evolutionary Biology, 2008
Background Mesoamerica is one of the world's most complex biogeographical regions, mostly due to its complex geological history. This complexity has led to interesting biogeographical processes that have resulted in the current diversity and distribution
Doadrio Ignacio, Domínguez-Domínguez Omar, Ornelas-García Claudia   +2 more
doaj   +1 more source

Recurrent Body Shape Patterns in Cave‐ and Surface‐Dwelling Trichomycterid Catfishes

Journal of Morphology, Volume 287, Issue 9, September 2026.
Multivariate shape analyses reveal that body shape consistently differs between cave‐ and surface‐dwelling trichomycterids in northeastern Colombia, with cave species exhibiting fusiform bodies while surface species showed deeper shapes consistently in different clades.
Nelson Falcón‐Espitia, Carlos Daniel Cadena   +1 more
wiley   +1 more source

Biocompatibility Assessment of Lithium‐Ion Battery Materials in Medical Devices

Small Structures, Volume 7, Issue 9, September 2026.
How safe are lithium‐ion battery materials for medical devices? Antimicrobial performance, cytotoxicity, and biotoxicity are systematically evaluated, and a multidimensional risk‐assessment framework is developed to classify materials from negligible to high risk.
Tingyu Hua, Ming Xu, Zhuofei Jia, Zhiwei Tao, He Yin, Jinzhi Lv, Shanshan Li, Jianan Wang, Wei Yan, Jinhai Wang, Yunlong Zhao   +10 more
wiley   +1 more source