A new Brachyrhamdia (Siluriformes: Heptapteridae) from Rio Japura basin, Brazil, with comments on its phylogenetic affinities, biogeography and mimicry in the genus

Autor(es)

Slobodian, Veronica ^{[1, 2]} ; Bockmann, Flavio Alicino ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, FFCLRP, Programa Posgrad Biol Comparada, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Lab Ictiol, Museu Zool, BR-04218970 Sao Paulo - Brazil

^[3] Univ Sao Paulo, FFCLRP, Dept Biol, LIRP, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; v. 3717, n. 1, p. 1-22, SEP 26 2013.
• Citações Web of Science: 7

Resumo

Brachyrhamdia thayeria is herein described as a new heptapterid species from Rio Japura, a left margin tributary of the Rio Solimoes, Amazonas basin, Brazil. The new species is diagnosed from all its congeners by having a putative autapomorphy: dark oblique stripe across the caudal peduncle, originating below the anterior half of adipose fin and ending at base of rays of ventral caudal-fin lobe. Brachyrhamdia thayeria is considered closely related to B. imitator and B. rambarrani with which it shares a low vertebral number and absence of lateral stripe along trunk. The new species shares exclusively with B. rambarrani the presence of a dark conspicuous bar along the dorsolateral region of trunk, a putative synapomorphy. Brachyrhamdia are distributed in lowland regions of northern South America where they inhabit small streams with running waters. The new species appears to have a mimetic association with the syntopic callichthyid Corydoras arcuatus. Herein, we argue in favor of the hypothesis that the interaction between species of Brachyrhamdia and Pimelodella or Corydoras is Mullerian mimicry. (AU)

• Processo FAPESP: 09/54931-0 - Melhoria e capacitação das coleções científicas do Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo
• Beneficiário: Carlos Alberto Garofalo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Acervos biológicos