This is the only European image found by IFS of A. papillosa with a wine glass mark, apart from Fig. 5B in Kienberger et al. (2016) which shows a sequenced A. papillosa from the White Sea. Whether the wine glass mark should be regarded as a form of white Y is an open question.
Left: Metridium senile from same site.
Mersey Estuary, England. February 2010.