A deformed valve of the Eemian fossil Mactra stultorum plistoneerlandica Van Regteren Altena, 1937 collected at the Zandmotor (province of Zuid-Holland, The Netherlands) is described and discussed. This deformation was already known from recent Mactra stultorum cinerea Montagu, 1808, but, until now, not known from this fossil subspecies. lts most likely origin is siphon-grazing by flatfish.

, ,
Spirula

CC BY-NC 4.0 NL ("Naamsvermelding-NietCommercieel")

Nederlandse Malacologische Vereniging

B. Langeveld, & H. Mulder. (2013). Een misvormde Mactra stultorum plistoneerlandica Van Regteren Altena, 1937 van de Zandmotor (Zuid-Holland): sifo-grazende platvissen in het Eemien. Spirula, 393, 117–118.