Ylistrum is a genus of marine bivalve mollusks in the family Pectinidae, the scallops.
There are four species currently in the genus: Ylistrum balloti (Bernardi, 1861) Ylistrum japonicum (Gmelin, 1791) Ylistrum morganense (Beu & Darragh, 2001) Ylistrum subcostatum (Beu & Darragh, 2001)
Previously, these species were considered to be members of Amusium, but a 2014 paper determined that the resemblance of their shell to Amusium pleuronectes is a case of convergent evolution; thorough studies of genetics and morphology allowed for the description of Ylistrium as a new genus, being sister to Antillipecten.Mynhardt, G.; Alejandrino, A.; Puslednik, L.; Corrales, J.; Serb, J. M. (2014). Shell shape convergence masks biological diversity in gliding scallops: description of Ylistrum n. gen. (Pectinidae) from the Indo-Pacific Ocean. Journal of Molluscan Studies. 80(4): 400-411
References