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Skin-digging tanaids: the unusual parasitic behaviour of Exspina typica in Antarctic waters and worldwide deep basins

Published online by Cambridge University Press:  03 March 2011

Maria Chiara Alvaro ,
Magdalena Błażewicz-Paszkowycz ,
Niki Davey  and
Stefano Schiaparelli
Maria Chiara Alvaro
Affiliation:
Museo Nazionale dell'Antartide (MNA), Sezione di Genova, Viale Benedetto XV no. 5, Genova I-16132, Italy
Magdalena Błażewicz-Paszkowycz
Affiliation:
University of Łódź, Department of Polar Biology and Oceanobiology, ul. Banacha 12/16, Łódź 90-237, Poland
Niki Davey
Affiliation:
National Institute of Water and Atmosphere Research Ltd, 217 Akersten Street, PO Box 893, Nelson, New Zealand
Stefano Schiaparelli*
Affiliation:
Dipartimento per lo Studio del Territorio e delle sue Risorse (Dip.Te.Ris.), Università di Genova, C.so Europa 26, Genova I-16132, Italy
*
*corresponding author: stefano.schiaparelli@unige.it
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Abstract

The order Tanaidacea includes over 1000 species which are mainly free-living or tube-dwelling detritivores. Exspina typica Lang, 1968 represents an exception to these common life styles, having being found in the intestine and body cavity of deep sea holothuroids. The 2008 New Zealand ‘IPY-CAML Cruise’ held in the Ross Sea collected several deepwater holothuroids that were observed to carry specimens of E. typica inside their coelomic cavity. A clear interpretation of this association was hence possible. Even if E. typica shows slight adaptations to a parasitic life style, the tanaids were found to actively ‘dig’ into the host's skin, grasping tissue with their claws and producing tunnels in the body wall. It is therefore possible to clearly define this association, which is here reported from the Antarctic for the first time, as parasitism.

Keywords

HolothuroideaparasitismRoss SeaTanaidacea
Type
Biological Sciences
Information
Antarctic Science , Volume 23 , Issue 4 , 12 July 2011 , pp. 343 - 348
Copyright
Copyright © Antarctic Science Ltd 2011

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