Marine Biodiversity

, Volume 48, Issue 1, pp 695–702 | Cite as

Deep-sea decapods sampled or observed with a manned submersible at the Rio Grande Rise (SW Atlantic), including the first record of four species from this region

  • Irene Azevedo Cardoso
  • Jose Angel Alvarez Perez
  • Hiroshi Kitazato
Short Communication
  • 89 Downloads

Abstract

The Rio Grande Rise (RGR) is a volcanic topographic structure of the Southwest Atlantic basin that rises over 3000 m from the seafloor and is located half way between the Brazilian continental margin (~ 30°S latitude) and the Mid-Atlantic Ridge. Previous records of decapods at the RGR are uncertain or non-existent. The observations and material examined here were collected by the manned submersible Shinkai 6500 during two dives to the plateau of the RGR main topographic feature, known as Alpha. Additional records were determined by analysing high-definition photos and videos obtained by the Shinkai 6500. Five species of deep-sea decapods were found: a Solenoceridae, Hymenopenaeus debilis Smith, 1882 previously sampled at the Brazilian slope; a Nematocarcinidae, Nematocarcinus parvus Burukovsky, 2000 previously unknown from the Atlantic Ocean; a Parapaguridae, Strobopagurus gracilipes (Milne-Edwards, 1891); a rare Palinuridae, Projasus parkeri (Stebbing, 1902); and the brachyuran Chaceon sanctaehelenae Manning & Holthuis, 1989 that were never sampled in the western Atlantic Ocean. The results show that the RGR decapod fauna is rare, unknown and, in its great majority, distinct, at the species level, from that found at the South American slope. At the genus and family levels, however, we can observe similarities between the RGR decapod fauna and that recorded on the South American slope. Unique exploration initiatives such as this can improve significantly the knowledge on western Atlantic deep-sea biodiversity and contribute to the understanding of deep-sea biogeography.

Keywords

Deep-sea decapods Rio Grande Rise Southwestern Atlantic Ocean Shinkai 6500 submersible 

Notes

Acknowledgements

Special thanks are due to the crew of the Shinkai 6500 manned submarine and the Yokosuka support vessel. The authors would like to acknowledge Dr. Rafael Lemaitre (National Museum of Natural History, Washington, USA) for the help with identification of the Strobopagurus/pteropod association, and Dr. Marcos Tavares (MZUSP) for the brachyuran identification. Funding of Brazilian scientists for the ‘Iata Piuna’ cruise was provided by a grant from CAPES (Program CAPES – JSPS, AUXPE – JSPS – 0059-2013, Ministry of Education, Brazil). The second author is supported by a CPNq productivity fellowship (process 309837/2010-3).

Supplementary material

12526_2017_836_MOESM1_ESM.mp4 (28.8 mb)
ESM 1 (MP4 29,495 kb)

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Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Irene Azevedo Cardoso
    • 1
  • Jose Angel Alvarez Perez
    • 2
  • Hiroshi Kitazato
    • 3
  1. 1.Setor de Carcinologia, Departamento de InvertebradosMuseu Nacional/UFRJRio de JaneiroBrazil
  2. 2.Grupo de Estudos Pesqueiros, Centro de Ciências Tecnológicas da Terra e do MarUniversidade do Vale do ItajaíItajaíBrazil
  3. 3.Japan Agency for Marine-Earth Science and TechnologyYokosukaJapan

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