A new species of the rare deep-sea genus Sciadonus Garman, 1899 (Teleostei, Bythitidae) from off Brazil, with a discussion of the evolution of troglomorphism and miniaturization in the aphyonid clade

Autor(es)

de Melo, Marcelo Roberto Souto ; Gomes, Amanda Alves ; Moller, Peter Rask ; Nielsen, Jorgen G.

• Tipo de documento: Artigo Científico
• Fonte: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS; v. 180, p. 8-pg., 2022-01-11.

Resumo

A new species of the rare, deep-sea genus Sciadonus Garman, 1899 (Bythitidae) is described based on two specimens obtained by the Brazilian R/V Alpha Crucis on the continental slope off Sa & SIM;o Paulo State, Southeastern Brazil, western South Atlantic. It differs from its congeners by the combination of the following characters: body pale lacking dark pigmentation except for on female claspers; a pair of dermal tissue flaps anteriorly on lower jaw; pelvic-fin rays present; precaudal vertebrae 39 or 40 and total vertebrae 74 or 75. The key to the species of Sciadonus is updated. A discussion of the presence and differentiation between troglomorphic and miniature characteristics among the species in the aphyonid clade is provided and compared with other bythitids. (AU)

• Processo FAPESP: 17/12909-4 - Diversidade e evolução de peixes de oceano profundo: DEEP-OCEAN
• Beneficiário: Marcelo Roberto Souto de Melo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Jovens Pesquisadores