Antarctic associations: the parasitic relationship between the gastropod <Emphasis Type="Italic">Bathycrinicola tumidula</Emphasis> (Thiele, 1912) (Ptenoglossa: Eulimidae) and the comatulid <Emphasis Type="Italic">Notocrinus virilis</Emphasis> Mortensen, 1917 (Crinoidea: Notocrinidae) in the Ross Sea |
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Authors: | S Schiaparelli C Ghirardo J Bohn M Chiantore G Albertelli R Cattaneo-Vietti |
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Institution: | (1) Museo Nazionale dell’Antartide (MNA), Università di Genova, C.so Europa 26, Genova, I-16132, Italy;(2) Dipartimento per lo Studio del Territorio e delle sue Risorse (Dip.Te.Ris.), Università di Genova, C.so Europa 26, Genova, I-16132, Italy;(3) Zoologische Staatssammlung München, Münchhausenstr. 21, D-81247 München, Germany |
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Abstract: | The first case of parasitic association between an eulimid mollusc (Gastropoda, Ptenoglossa) and a comatulid (Echinodermata:
Crinoidea) is reported for Antarctica. The mollusc involved in the association is Eulima
tumidula Thiele, 1912, which has now been ascribed to the genus Bathycrinicola Bouchet & Warén, 1986, never recognized before in Antarctica. This genus is present only in the NE Atlantic Ocean and the Mediterranean Sea, and
encompass species which are specific parasites of the sessile stalked crinoids of the family Bathycrinidae. However, in Antarctica,
Bathycrinicola tumidula (Thiele, 1912) exploits the endemic vagile comatulid Notocrinus virilis Mortensen, 1917, and attains the largest known dimensions (∼1 cm) for a Bathycrinicola species. The absence of suitable Bathycrinidae host in modern Antarctic benthic assemblages, as well as the long paleontological
history of the genus Notocrinus in Antarctica, suggest a possible ‘host-switch’ phenomenon. This event could reasonably have occurred when many species underwent
considerable bathymetric shifts, during the dramatic climatic changes that affected Antarctica. |
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