A new species of Characidium Reinhardt (Ostariophysi: Characiformes: Crenuchidae) from headwaters of rio Pacaas Novos, rio Madeira basin, Rondonia, Brazil

Author(s)

Zanata, Angela M. ^[1] ; Ohara, Willian M. ^[2]

Affiliation

^[1] Univ Fed Bahia, Inst Biol, Dept Zool, BR-40170290 Salvador, BA - Brazil

^[2] Univ Sao Paulo, Museu Zool, BR-04299970 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Zootaxa; v. 4021, n. 2, p. 368-376, SEP 25 2015.
• Web of Science Citations: 7

Abstract

Characidium summus, new species, is described from rio Pacaas Novos, rio Madeira basin, Rondonia, Brazil. The new species is the unique among congeners for completely lacking an adipose fin and having a complete lateral line. Characidium summus can be further distinguished from congeners, including C. vestigipinne that also has a complete lateral line and adipose fin absent, vestigial or reduced by the absence of dark bars or spots on head, body or fins, except for a dark blotch on the rear of the opercle, a narrow midlateral dark stripe, and a dark basicaudal spot. In addition, C. summus possess a vestigial supraorbital and a remarkably small pseutotympanum. The possible mimetic relationship between the new species with Erythrinus erythrinus is discussed. (AU)

• 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: 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