English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/92975
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

A giant foraminifer that converges to the feeding strategy of carnivorous sponges: Spiculosiphon oceana sp. nov. (Foraminifera, Astrorhizida)

AuthorsMaldonado, Manuel ; López-Acosta, María ; Sitjà, Cèlia ; Aguilar, Ricardo; García, Silvia; Vacelet, Jean
KeywordsCollagen-like cement
Bioturbation
Adaptive test
Astrorhizid
Agglutinated
Siliceous test
Sponge spicule
Benthic foraminifera
Silica
Tellurium
Issue Date2013
PublisherMagnolia Press
CitationZootaxa 3669 (4): 571-584 (2013)
AbstractThe foraminifer Spiculosiphon oceana sp. nov. is a giant (>4 cm) agglutinated astrorhizid, which makes the second known species of this unusual genus and its first Mediterranean record. It has a peculiar stalked, capitate, monothalamous test. Bleach digestion and X-ray microanalysis indicated the test to be made exclusively of siliceous sponge spicules agglutinated in organic cement. The organism stands on a hollow, 4 cm long, 0.5 cm thick stalk built with highly selected, long and thin spicule fragments, tightly cemented together in parallel to the main axis of the stalk. The proximal end of the stalk is closed and slightly expanded into a bulb-like structure, designed to penetrate between the sand grains and maintaining the test upright while avoiding a permanent attachment to the substratum. The distal stalk end becomes a hollow, globelike structure that contains the main protoplasm. The globelike region is built with loosely agglutinated and irregularlyshaped spicules, allowing extrusion of the pseudopodia through the cavities between the spicules. The globelike structure also serves as an anchoring basis, from which long and thin, solid tracts protrude radially to make a spherical crown that attains about 4 mm in total diameter. The radiating tracts are built with highly selected aciculate spicule fragments held together with a translucent organic cement. They provide skeletal support for the extension of a crown of pseudopodia into the water column. This arrangement is thought to enhance the chances of the pseudopodia to contact demersal planktonic prey. In summary, Spiculosiphon species collect and arrange sponge spicules with high selectivity to recreate a body morphology that strongly converges to that of some carnivorous sponges, which allows these predatory foraminifera to exploit a prey capturing strategy similar to that of the carnivorous sponges. This idea is also consistent with our report of an additional, yet undetermined, Spiculosiphon species occurring in the same sublittoral Mediterranean cave where carnivorous sponges were first discovered.
Description14 páginas, 6 figuras
Publisher version (URL)http://dx.doi.org/10.11646/zootaxa.3669.4.9
URIhttp://hdl.handle.net/10261/92975
DOIhttp://dx.doi.org/10.11646/zootaxa.3669.4.9
ISSN1175-5326
E-ISSN1175-5334
Appears in Collections:(CEAB) Artículos
Files in This Item:
File Description SizeFormat 
Maldonado.pdf8,93 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.