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A new carnivorous sponge, Chondrocladia robertballardi sp. nov. (Porifera: Cladorhizidae) from two north-east Atlantic seamounts

Published online by Cambridge University Press:  23 September 2014

J. Cristobo*
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Av./Príncipe de Asturias 70 bis, 33212 Gijón, Asturias, Spain Departamento de Zoología y Antropología Física, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
P. Rios
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Av./Príncipe de Asturias 70 bis, 33212 Gijón, Asturias, Spain
S.A. Pomponi
Affiliation:
Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 U.S. 1 North, Fort Pierce, FL 34946, USA
J. Xavier
Affiliation:
Department of Biology, Centre for Geobiology, University of Bergen, Thormøhlensgate 53A/B, N-5020 Bergen, Norway
*
Correspondence should be addressed to: J. Cristobo, Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Av./Príncipe de Asturias 70 bis, 33212 Gijón, Asturias, Spain email: cristobo@gi.ieo.es

Abstract

Carnivorous sponges (Porifera: Cladorhizidae) are a particularly interesting group of species typically occurring in deep-sea habitats. In this study a new species, Chondrocladia (Chondrocladia) robertballardi sp. nov., is described from specimens collected on two large north-east Atlantic seamounts – the Gorringe and Galicia Banks – located off the Iberian Peninsula. The holotype, collected on the Gorringe Bank by ROV, is a large, dichotomously branched and stalked sponge with translucent spheres in the middle of secondary axes and a rhizoid basal fixation system. Direct observations on the habit of the new species were made from the ROV. The paratypes, collected on the Galicia Bank by dredge and trawling, are fragments of different sizes. The skeleton is composed of a single class of styles and isochelae. All specimens were collected at similar depths (1400–1738 m) within the upper bathyal, and at the same longitude but separated by 670 km. A synthesis of the geographic as well as bathymetric distribution of this genus is presented. The species is compared with all known species of this genus worldwide.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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