The monophyly of Crenuchinae and description of two new species of Poecilocharax (Teleostei: Crenuchidae) based on phenotypic and genotypic evidence

Author(s)

Ohara, Willian M. ; Pastana, Murilo ; Camelier, Priscila

• Document type: Journal article
• Source: ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY; v. 197, n. 2, p. 32-pg., 2022-05-16.

Abstract

Crenuchinae is a subfamily of the fish family Crenuchidae distributed in the Amazon Basin with pronounced sexual dimorphism and exuberant colour patterns. Recent fieldwork in the tributaries of the Rio Aripuana drainage, a large tributary of the Rio Madeira (Amazon Basin), resulted in the discovery of two distinctive, undescribed species of the crenuchin genus Poecilocharax, which are formally described herein, combining morphological and molecular data. These are the first representatives of Crenuchinae discovered after a gap of 57 years and the first records of Poecilocharax from the tributaries of the right bank of the Rio Amazonas draining the Brazilian crystalline shield. Based on a taxonomic review including all species of the subfamily, we provide an expanded morphological diagnosis for Crenuchinae. This now includes characteristics related to the lateral-line canals of head and body, the number of dorsal-fin rays and sexually dimorphic traits. In addition, we review previous characteristics used to diagnose Crenuchus and Poecilocharax, providing comments on their polarity and distribution across the subfamily. A dichotomous key is provided for the first time for species of Crenuchinae. (AU)

• FAPESP's process: 16/03966-1 - Comparative phylogeography of freshwater fishes from the Atlantic Forest: a multilocus analysis in representatives of the family Characidae (Teleostei: Characiformes)
• Grantee: Priscila Camelier de Assis Cardoso
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/09321-5 - Miniature Characiformes (Teleostei: Ostariophysi): evolution, diversity and biogeography
• Grantee: Manoela Maria Marinho Koh
• Support Opportunities: BIOTA-FAPESP Program - Young Investigators Grants
• FAPESP's process: 13/22473-8 - Endemism and biogeographic analysis of fishes from Madeira River basin
• Grantee: Willian Massaharu Ohara
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/19075-9 - Diversity and evolution of Gymnotiformes (Teleostei, Ostariophysi)
• Grantee: Naercio Aquino Menezes
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/00840-6 - Speciation and biogeography in the genera Glandulocauda Eigenmann and Mimagoniates Regan (Characiformes: Characidae: Glandulocaudinae)
• Grantee: Priscila Camelier de Assis Cardoso
• Support Opportunities: Scholarships in Brazil - Doctorate