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An improbable opportunistic predator: the functional morphology of Pinna nobilis (Bivalvia: Pterioida: Pinnidae)

Published online by Cambridge University Press:  23 April 2018

Brian Morton  and
Sanja Puljas
Brian Morton*
Affiliation:
School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China
Sanja Puljas
Affiliation:
Department of Biology, Faculty of Science, University of Split, Ruđera Boškovića 33, Split, Croatia
*
Correspondence should be addressed to: Brian Morton School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China email: prof_bmorton@hotmail.co.uk
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Abstract

The functional morphology of Pinna nobilis is described, with special reference to the uniquely pinnid pallial organ, the similarly unique buccal (formerly pallial) gland, the stomach and its contents. The pallial gland produces sulphuric acid which as well as functioning as a shell cleaning swab may be involved in prey capture. The buccal gland discharging into the oesophagus has proteolytic digestive functions while the stomach is adapted for the reception and digestion of captured, mucous-bound, mesozooplanktonic and epi- and endo-benthic, prey items. Pinna nobilis is thus not simply either an accidental or incidental predator of such species but is opportunistic. The buccal glands and stomachs of other Pinnidae are not so specialized as in P. nobilis, possibly indicating that in the particular, oligotrophic, environment of the Mediterranean and Adriatic Seas, and in which it is endemic, P. nobilis has, in addition to being a typical ctenidial suspension feeder, become an opportunistic predator. Although the deep sea representatives of the Septibranchia (Anomalodesmata) and Propeamussidae are obligate predators, this is the first record of any bivalve functioning as an opportunistic predator with unique morphological adaptations to facilitate this.

Keywords

pallial glandsulphuric acidbuccal glandproteolytic enzymesstomach structure and contents
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 99 , Issue 2 , March 2019 , pp. 359 - 373
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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