journal article
Sep 23, 2015
Osteology of Priocharax and remarkable developmental truncation in a miniature Amazonian fish (Teleostei: Characiformes: Characidae)
Abstract
ABSTRACTEstablishing phylogenetic relationships of miniature fishes is challenging in taxa with developmental truncation. Within the Characiformes, developmental truncation appears to be relatively rare, with the Neotropical genus Priocharax being an example. Priocharax includes three miniature species among the smallest of the order and has been hypothesized to belong to the Heterocharacinae. The pronounced reduction in its skeleton, however, prevented a clearer evaluation of its relationships. The present detailed osteological study was designed to address this question and revealed that 21 bones are absent and nine other skeletal structures are simplified in Priocharax when compared to other characids. Comparison of the skeleton of adult Priocharax with early developmental stages of other characids demonstrated that most of the absences and simplifications can be interpreted as developmental truncations. The most striking developmental truncations are in the pectoral girdle, in which the endoskeleton remains entirely cartilaginous. Other interesting truncations are in the ethmoid region of the skull, infraorbital series, and Weberian apparatus, in which the claustrum is absent. Our study also revealed some unusual sexual dimorphisms in the pelvic girdle. Two cladistic analyses were performed to assess the relationships of Priocharax within the Heterocharacinae. The first consisted of a traditional analysis in which all absences and reductions of Priocharax were coded in the same way as in the remaining taxa. This resulted in three equally most parsimonious topologies, all of which have Priocharax as the most basal taxon of the Heterocharacinae. The second analysis incorporated ontogenetic information, and most absences and reductions of Priocharax were reinterpreted as apomorphic conditions and thus, coded differently from similar conditions in outgroups. This resulted in a single phylogenetic hypothesis with Priocharax and Gnathocharax as sister groups based on seven synapomorphies. Our approach demonstrates the importance of developmental studies to better understand morphological evolution of miniaturized, truncated taxa, and to generate hypotheses of their relationships. J. Morphol. 277:65–85, 2016. © 2015 Wiley Periodicals, Inc.
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Cited By
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Ossification of the cranium of
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(Characiformes: Acestrorhamphidae) with discussion of paedomorphic traits in the genus
Journal of Anatomy
Yasmim De Santana Santos, Manoela M. F. Marinho · 2025
Metrics
27
Citations
50
References
Details
- Published
- Sep 23, 2015
- Vol/Issue
- 277(1)
- Pages
- 65-85
- License
- View
Authors
Funding
Fundação de Amparo a Pesquisa do Estado de São Paulo
Award: 2010/50941-8
Projeto Saci-South American Characiformes Inventory (http://www.projeto-saci.com)
Award: FAPESP 2011/50282-7
Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq
Award: 307067/2010-6 (to M.T.P.)
Cite This Article
George M.T. Mattox, Ralf Britz, Mônica Toledo‐Piza (2015). Osteology of Priocharax and remarkable developmental truncation in a miniature Amazonian fish (Teleostei: Characiformes: Characidae). Journal of Morphology, 277(1), 65-85. https://doi.org/10.1002/jmor.20477
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