Distribution and comments on the morphology of Centroscymnus owstonii Garman, 1906 (Squaliformes: Somniosidae), with focus on its occurrence in the Indian Ocean

Author(s)

Weigmann, Simon ; Vaz, Diego F. B. ; White, William T. ; de Carvalho, Marcelo R. ; Thiel, Ralf

• Document type: Journal article
• Source: MARINE BIODIVERSITY; v. 46, n. 3, p. 641-653, SEP 2016.
• Web of Science Citations: 2

Abstract

The Roughskin Dogfish Centroscymnus owstonii is one of the most widespread deepwater shark species, but its global distribution is mostly based on patchy records. In this study, C. owstonii was reinvestigated with focus on its poorly known distribution in the western and eastern Indian Ocean. Previous records of the species from the Seychelles, which, for decades, were considered to be of a different species, were verified in this study. Furthermore, the first records from off Reunion Island, Madagascar, and Indonesia are provided, including the smallest free-swimming specimen of the species described in detail to date. Based on these specimens, a description of C. owstonii is given with updated and extended morphometric data, photographic documentation and scanning electron microscopy (SEM) images of dermal denticles. Additionally, specimens from the Indian Ocean are compared with specimens from the Pacific and Atlantic Oceans. For the Pacific Ocean, the first record from the central western North Pacific is provided from the Hawaiian-Emperor seamount chain. This record also represents the most open ocean known occurrence of C. owstonii. (AU)

• FAPESP's process: 13/13137-4 - Morphological and taxonomic review of genus Centroscymnus Barboza du Bocage & Capello 1864 (Chondrichthyes: Squaliformes: Somniosidae)
• Grantee: Diego Francisco Biston Vaz
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• FAPESP's process: 13/05292-0 - Molecular evolution of regulatory regions of HOX genes associated with fin morphology in fishes, with special emphasis in Chondrichthyes
• Grantee: Murilo de Carvalho
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 12/07712-3 - Morphological and taxonomic review of the genus Centroscymnus Barboza du Bocage & Capello 1864 (Chondrichthyes:Squaliformes:Somniosidae)
• Grantee: Diego Francisco Biston Vaz
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 12/05391-5 - Molecular evolution of regulatory regions of HOX genes associated with the morphology of fish fins, with special emphasis on Chondrichthyes
• Grantee: Marcelo Rodrigues de Carvalho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/05152-0 - Molecular evolution of regulatory regions of HOX genes associated with the morphology of fish fins, with special emphasis on Chondrichthyes
• Grantee: Murilo de Carvalho
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/09877-0 - Comparative analysis of the morphology of the feeding apparatus in Myliobatiform rays (Chondrichthyes: Batoidea)
• Grantee: Marcelo Rodrigues de Carvalho
• Support Opportunities: Regular Research Grants