Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01UQ1711)
Received: 8 May 2020
Accepted: 21 July 2020
First Online: 10 August 2020
: The oysters were collected under a standing permit to collect invasive species issued by the government of the German federal state Schleswig-Holstein. They were frozen or preserved in 95% Ethanol directly after collection.
: Not applicable. Pictures were taken by Christine Ewers-Saucedo and at the facilities of the Zoological Museum of the Christian-Albrechts University.
: We declare no competing interests.