Open Access Open Access  Restricted Access Subscription or Fee Access


DOI: http://dx.doi.org/10.11646/zootaxa.3920.3.4

Nematocharax costai Bragança, Barbosa & Mattos a junior synonym of Nematocharax venustus Weitzman, Menezes & Britski (Teleostei: Characiformes: Characidae)

NAÉRCIO A. MENEZES, ANGELA M. ZANATA, PRISCILA CAMELIER

Abstract


Analysis of morphometric and meristic data from specimens obtained from various river basins along the distribution of Nematocharax venustus revealed intraspecific variation among geographically isolated populations. A comparative analysis of these data with data from the original description of N. costai, in addition to data obtained from the holotype and topotypes of the species, showed broad overlap and absence of morphological features supporting the recognition of two species within Nematocharax. Characters previously used to distinguish N. costai from N. venustus, such as presence of hooks or spinules on dorsal and pelvic fins, number of hooks on anal-fin rays, occurrence of a pink horizontal mark on the caudal peduncle, number of supraneurals, and coloration of the pelvic-fin filament, are not useful to distinguish the two putative species. Thus, N. costai is considered herein as a junior synonym of N. venustus. Presence of a complete lateral line and length of fin-filaments of N. venustus are briefly discussed and a current overview of the distribution of the species is given. In view of the proposed synonymy of a so recently described species and aiming to avoid problems of similar nature in the future, we also take the opportunity to reinforce herein the importance of the examination of large population samples and of intraspecific variation of secondary sexual features.

 


Keywords


taxonomy, intraspecific variation, coastal rivers, sexual dimorphism

Full Text:

PDF/A (7.35 MB)

References


Bragança, P.H.N. de, Barbosa, M.A. & Mattos, J.L. (2013) A new Nematocharax species from the middle Contas River basin, northeastern Brazil (Characiformes: Characidae). Vertebrate Zoology, 63 (1), 3–8.

Bertaco, V.A. & Malabarba, L.R. (2005) A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins. Neotropical Ichthyology, 3 (1), 83–88.
http://dx.doi.org/10.1590/S1679-62252005000100004

Camelier, P. & Zanata, A.M. (2014) A new species of Astyanax Baird & Girard (Characiformes: Characidae) from the Rio Paraguaçu basin, Chapada Diamantina, Bahia, Brazil, with comments on bony hooks on all fins. Journal of Fish Biology, 2014, 1–16.
http://dx.doi.org/10.1111/jfb.12295

Collette, B.B. (1977) Epidermal breeding tubercles and bony contact organs in fishes. In: Spearman, R.I.C. (Ed.), Comparative Biology of the Skin, Vol. 39, Symposia of the Zoological Society of London, London, pp. 225–268.

Fink, W.L. (1976) A new genus and species of characid fish from the Bayano river basin, Panama (Pisces: Cypriniformes). Proceedings of the Biological Society of Washington, 88 (80), 881–844.

Fink, W.L. & Weitzman, S.H. (1974) The so-called cheirodontin fishes of Central America with description of two new species (Pisces: Characidae). Smithsonian Contributions to Zoology, 172, 1–46.
http://dx.doi.org/10.5479/si.00810282.172

Javonillo, R., Malabarba, L.R., Weitzman, S.H. & Burns, J.R. (2010) Relationships among major lineages of characid fishes (Teleostei: Ostariophysi: Characiformes), based on molecular sequence data. Molecular Phylogenetics and Evolution, 54 (2), 498–511.
http://dx.doi.org/10.1016/j.ympev.2009.08.026

Malabarba, L.R. & Weitzman, S.H. (2003) Description of a new genus with six new species from southern Brazil, Uruguay and Argentina, with a discussion of a putative characid clade (Teleostei: Characiformes: Characidae). Comunicações do Museu de Ciências da PUCRS, série Zoologia, 16, 67–151.

Marinho, M.M.F. & Langeani, F. (2010) A new species of Moenkhausia from the rio Amazonas and rio Orinoco basins (Characiformes: Characidae). Zootaxa, 2577, 57–68.
http://dx.doi.org/10.1111/j.1095-8649.2010.02719.x

Menezes, N.A., Weitzman, S.H., Oyakawa, O.T., Lima, F.C.T. de, Castro, R.M.C. & Weitzman, M.J. (2007) Peixes de Água Doce da Mata Atlântica: lista preliminar das espécies e comentários sobre conservaçãode peixes de água doce neotropicais. Universidade de São Paulo, São Paulo, 406 pp.

Mirande, J.M. (2010) Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy. Neotropical Ichthyology, 8 (3), 385–368.
http://dx.doi.org/10.1590/S1679-62252010000300001

Tagliacollo, V.A., Souza-Lima, R., Benine, R.C. & Oliveira, C. (2012) Molecular phylogeny of Aphyocharacinae (Characiformes, Characidae) with morphological diagnoses for the subfamily and recognized genera. Molecular phylogenetics and evolution, 64 (2), 297–307.
http://dx.doi.org/10.1016/j.ympev.2012.04.007

Taylor, W.R. & Van Dyke, G.C. (1985) Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9, 107–109.

Thomaz, A.T., Malabarba, L.R. & Bonatto, S.L. (2010) The phylogenetic placement of Hollandichthys Eigenmann 1909 (Teleostei: Characidae) and related genera. Molecular Phylogenetics and Evolution, 57 (2010), 1347–1352.
http://dx.doi.org/10.1016/j.ympev.2010.10.006

Weitzman, S.H. & Thomerson, J.E. (1970) A new species of glandulocaudine characid fish, Hysteronotus myersi, from Peru. Proceedings of the California Academy of Sciences, 38, 139–155.

Weitzman, S.H., Menezes, N.A. & Britski, H.A. (1986) Nematocharax venustus, a new genus and species from the Rio Jequitinhonha, Minas Gerais, Brazil (Teleostei: Characidae). Proceedings of the Biological Society of Washington, 99 (2), 335–346.


Refbacks

  • There are currently no refbacks.


 
ISSN 1175-5326 (Print Edition) & ISSN 1175-5334 (Online Edition)
Published by Magnolia Press, Auckland, New Zealand
A founding journal of Biotaxa