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Two new species of miniature tetras of the fish genus Priocharax from the Rio Juruá drainage, Acre, Brazil (Teleostei: Characiformes: Characidae)

Publication: Canadian Journal of Zoology
10 February 2023

Abstract

Two new miniature tetra species of the Neotropical characid genus Priocharax Weitzman and Vari, 1987 are described, raising the known species diversity to seven. Both species occur in the Rio Juruá system, Cruzeiro do Sul municipality, Acre State, Brazil. Priocharax toledopizae sp. nov. occurs in streams flowing to the lower Rio Moa, a tributary of Rio Juruá, and is distinguished from congeners by a combination of presence of claustrum and infraorbitals 1 and 2, absence of infraorbital 3, and presence of five branched pelvic-fin rays. Priocharax marupiara sp. nov. is known from Igarapé Canela Fina, tributary of Rio Juruá, and is diagnosed by a combination of fewer maxillary teeth (21–27 vs. 27–58 in remaining species), fewer branched anal-fin rays (18–23 vs. 22–27 in two species) and colour pattern. Both species differ from each other in the general body shape: Priocharax toledopizae is more robust with deep body and Priocharax marupiara more elongate. DNA barcode data support the specific distinctness of the two new species and that of the other five species in the genus. We describe a remarkable sexual dimorphism of the pelvic girdle of Priocharax toledopizae in which the pelvic musculature is enlarged forming a pedicel for the fin in mature males. Most localities where these species were found suffer from significant degradation mainly due to litter accumulation and suppression of the riparian forest, raising concerns about their conservation status.

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Information & Authors

Information

Published In

cover image Canadian Journal of Zoology
Canadian Journal of Zoology
Volume 101Number 4April 2023
Pages: 248 - 266

History

Received: 16 September 2022
Accepted: 23 November 2022
Version of record online: 10 February 2023

Data Availability Statement

Data generated or analyzed during this study are provided in full within the published article and its supplementary materials, and are also available from the corresponding author upon reasonable request.  Molecular data generated or analyzed during this study are available in the GenBank at https://www.ncbi.nlm.nih.gov/genbank/.

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Key Words

  1. anatomy
  2. DNA barcode
  3. Neotropics
  4. integrative taxonomy
  5. miniature tetra
  6. systematics

Authors

Affiliations

Laboratório de Ictiologia de Sorocaba, Departamento de Biologia, Universidade Federal de São Carlos, Sorocaba, São Paulo 18052-780, Brazil
Author Contributions: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Writing – original draft, and Writing – review & editing.
Ralf Britz
Senckenberg Natural History Collections Dresden, Museum of Zoology, Dresden, 01109, Germany
Author Contributions: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Supervision, Writing – original draft, and Writing – review & editing.
Camila S. Souza
Departamento de Biologia Estrutural e Funcional, Instituto de Biociências, Universidade Estadual Paulista – Campus Botucatu, Botucatu, São Paulo 18618-689, Brazil
Author Contributions: Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Validation, Writing – original draft, and Writing – review & editing.
André L.S. Casas
Departamento de Ciências do Mar, Instituto do Mar, Universidade Federal de São Paulo, Santos, São Paulo 11015-020, Brazil
Author Contributions: Data curation, Investigation, Writing – original draft, and Writing – review & editing.
Flávio C.T. Lima
Museu de Diversidade Biológica, Universidade Estadual de Campinas, Caixa Postal 6109, Campinas, São Paulo 13083-683, Brazil
Author Contributions: Data curation, Funding acquisition, Investigation, Writing – original draft, and Writing – review & editing.
Claudio Oliveira
Departamento de Biologia Estrutural e Funcional, Instituto de Biociências, Universidade Estadual Paulista – Campus Botucatu, Botucatu, São Paulo 18618-689, Brazil
Author Contributions: Data curation, Funding acquisition, Project administration, Resources, Supervision, Writing – original draft, and Writing – review & editing.

Author Contributions

Conceptualization: GMTM, RB
Data curation: GMTM, RB, CSS, ALSC, FCTL, CO
Formal analysis: GMTM, RB, CSS
Funding acquisition: GMTM, FCTL, CO
Investigation: GMTM, RB, CSS, ALSC, FCTL
Methodology: GMTM, RB, CSS
Project administration: GMTM, CO
Resources: GMTM, CSS, CO
Software: GMTM, CSS
Supervision: GMTM, RB, CO
Validation: CSS
Writing – original draft: GMTM, RB, CSS, ALSC, FCTL, CO
Writing – review & editing: GMTM, RB, CSS, ALSC, FCTL, CO

Competing Interests

The authors declare there are no competing interests.

Funding Information

This research was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP; grant 2017/01970-4). FCTL was supported by FAPESP (grants 2011/51532-7 and 2013/20936-0). CO received financial support from FAPESP (grant 2020/13433-6) and Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (proc. 306054/2006-0).

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