Trichomycterus dali: a new highly troglomorphic catfish (Silurifomes: Trichomycteridae) from Serra da Bodoquena, Mato Grosso do Sul State, Central Brazil

Autor(es)

Rizzato, Pedro Pereira ^[1] ; Costa-, Jr., Edmundo P. D. ^[2] ; Trajano, Eleonora ^[3] ; Bichuette, Maria Elina ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Ecol & Biol Evolut, BR-13565905 Sao Carlos, SP - Brazil

^[2] Prefeitura Municipal Bonito MS, Secretaria Municipal Meio Ambiente, BR-79290000 Bonito, MS - Brazil

^[3] Univ Sao Paulo, Dept Zool, Inst Biociencias, BR-05422970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 9, n. 3, p. 477-491, JUL-SEP 2011.
• Citações Web of Science: 7

Resumo

Trichomycterus dali, new species, is described from flooded limestone caves in Serra da Bodoquena karst area, State of Mato Grosso do Sul, Central Brazil. The new species is diagnosed by a unique character in the genus, the presence of conspicuous, ridge-like adipose folds lining dorsally throughout the body. Trichomycterus dali can be further distinguished readily from epigean congeners by the reduction of eyes and skin pigmentation (except for T. gorgona), and from remaining congeners (i.e., all hypogean plus T. gorgona) by the total loss of eyes, not visible externally (except for T. sandovali and T. spelaeus). Other diagnostic features includes very long barbels, especially the nasal (99.3-143.5% HL) and the maxillary (97.0-131.3% HL), pectoral-fin ray count reaching I,9 and a unique cranial fontanel with a conspicuous constriction on the meeting point of supraoccipital and the two frontal bones. The troglobitic status of the species is suggested by the presence of troglomorphisms on an advanced degree, especially the reduction of skin pigmentation, the total loss of eyes and the enlarged barbels. In addition, the presence of a well developed adipose fold in adults may indicate a distinctive adaptation acquired by neoteny to withstand the food scarce conditions of its hypogean habitat. (AU)

• Processo FAPESP: 09/15030-7 - Descrição de duas novas espécies de bagres subterrâneos (siluriformes, trichomycteridae) das regiões central e nordeste do brasil
• Beneficiário: Pedro Pereira Rizzato
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 03/00794-5 - Fauna subterrânea aquática brasileira: biodiversidade, biologia, evolução, ecologia e conservação
• Beneficiário: Eleonora Trajano
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 97/09274-1 - Levantamento faunistico das cavernas inundadas da serra da bodoquena regiao de bonito, ms.
• Beneficiário: Edmundo Publio Dineli da Costa Junior
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica