The Laterosensory Canal System in Epigean and Subterranean Ituglanis (Siluriformes: Trichomycteridae), With Comments About Troglomorphism and the Phylogeny of the Genus

Autor(es)

Rizzato, Pedro Pereira ; Bichuette, Maria Elina

• Tipo de documento: Artigo Científico
• Fonte: Journal of Morphology; v. 278, n. 1, p. 4-28, JAN 2017.
• Citações Web of Science: 4

Resumo

The laterosensory system is a mechanosensory modality involved in many aspects of fish biology and behavior. Laterosensory perception may be crucial for individual survival, especially in habitats where other sensory modalities are generally useless, such as the permanently aphotic subterranean environment. In the present study, we describe the laterosensory canal system of epigean and subterranean species of the genus Ituglanis (Siluriformes: Trichomycteridae). With seven independent colonizations of the subterranean environment in a limited geographical range coupled with a high diversity of epigean forms, the genus is an excellent model for the study of morphological specialization to hypogean life. The comparison between epigean and subterranean species reveals a trend toward reduction of the laterosensory canal system in the subterranean species, coupled with higher intraspecific variability and asymmetry. This trend is mirrored in other subterranean fishes and in species living in different confined spaces, like the interstitial environment. Therefore, we propose that the reduction of the laterosensory canal system should be regarded as a troglomorphic (5 cave-related) character for subterranean fishes. We also comment about the patterns of the laterosensory canal system in trichomycterids and use the diversity of this system among species of Ituglanis to infer phylogenetic relationships within the genus. (C) 2016 Wiley Periodicals, Inc. (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: 11/15429-7 - PADRÕES MORFOLÓGICO-EVOLUTIVOS PARA CARACTERES EXTERNOS E SENSORIAIS EM ESPÉCIES SUBTERRÂNEAS DO GÊNERO Ituglanis COSTA & BOCKMANN, 1993(SILURIFORMES: TRICHOMYCTERIDAE)
• Beneficiário: Pedro Pereira Rizzato
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 11/06736-3 - Descrição de uma nova espécie de bagre subterrâneo (Siluriformes: Trichomycteridae: Trichomycterinae) da região de Mambaí, Brasil Central
• Beneficiário: Pedro Pereira Rizzato
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 10/08459-4 - As áreas cársticas de São Desidério, serra do Ramalho (sudoeste da Bahia) e São Domingos (nordeste de Goiás) representam hot spots de biodiversidade? Análise das comunidades cavernícolas e critérios para sua proteção
• Beneficiário: Maria Elina Bichuette
• Modalidade de apoio: Auxílio à Pesquisa - Regular