In November 1959 Dr. A J.M. Leeuwenberg collected a large number of common bivalves, living off the Dutch coast, on the Island of Terschelling. It especially appeared that specimens (over 30%) of Mactra stultorum had developed blister pearls.
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| Spirula | |
| CC BY-NC 4.0 NL ("Naamsvermelding-NietCommercieel") | |
| Organisation | Nederlandse Malacologische Vereniging |
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Gijs C. Kronenberg. (2004). Zijn blisterparels zeldzaam?. Spirula, 339(1), 72–72.
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