Redescription of Astyanax multidensEigenmann, 1908 (Characiformes: Characidae), a small characid of the Brazilian Amazon

Author(s)

Manoela M. F. Marinho ; José L. O. Birindelli ^[2]

• Document type: Journal article
• Source: Neotropical Ichthyology; v. 11, n. 1, p. 45-54, 2013-03-00.

Abstract

Astyanax multidensis redescribed based on syntypes and additional specimens from the rio Amazonas at Silves, Amazonas State and Óbidos, Pará State, and the rios Trombetas, Tapajós, Xingú, and Araguaia.Astyanax multidensis distinguished from congeners by the unique combination of five to seven maxillary teeth, 31 to 34 pored lateral-line scales, 20 to 23 branched anal-fin rays, and a dark triangular blotch restricted to the middle caudal-fin rays. Astyanax multidens was collected syntopically with Jupiaba paranatinga in the rio Tapajós basin and with Jupiabacf. essequibensis in the rio Xingu basin, which have paired anteriorly oriented pelvic-fin spines, a antipredatory mechanism. Based on the external morphological similarity betweenAstyanax multidens and the two species ofJupiaba, their sympatric occurrence, and their distinct phylogenetic position, we interpret this a case of Batesian mimicry. (AU)

• FAPESP's process: 11/50282-7 - An inventory of the Characiform fish fauna (Teleostei, Ostariophysi) from South America
• Grantee: Naercio Aquino Menezes
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 09/15075-0 - Phylogenetic relationships and taxonomic revision of the species of Copella Myers, 1956 (Characiformes: Lebiasinidae)
• Grantee: Manoela Maria Marinho Koh
• Support Opportunities: Scholarships in Brazil - Doctorate