Table 5 List of taxa used in the phylogenetic analysis

Katharina tunicata

Neoloricata; Chitonida; Acanthochitonina; Mopaliidae

NC_001636

Gastropoda

Aplysia californica

Orthogastropoda; Apogastropoda; Heterobranchia; Euthyneura; Opisthobranchia; Anaspidea; Aplysioidea; Aplysiidae;

NC_005827

Pupa strigosa

Orthogastropoda;Apogastropoda; Heterobranchia; Euthyneura; Opisthobranchia; Architectibranchia; Acteonoidea; Acteonidae

NC_002176

Albinaria caerulea

Pulmonata; Stylommatophora; Sigmurethra; Clausilioidea; Clausiliidae

NC_001761

Cepaea nemoralis

Pulmonata; Stylommatophora; Sigmurethra; Helicoidea; Helicidae

NC_001816

Bivalvia

Mytilus galloprovincialis

Bivalvia; Pteriomorphia; Mytiloida;Mytiloidea; Mytilidae

NC_006886

Mytilus edulis

Bivalvia; Pteriomorphia; Mytiloida; Mytiloidea; Mytilidae

NC_006161

Argopecten irradians

Bivalvia; Pteriomorphia; Pectinoida;Pectinoidea; Pectinidae

Placopecten magellanicus

Bivalvia; Pteriomorphia; Pectinoida;Pectinoidea; Pectinidae

NC_007234

Mizuhopecten yessoensis

Bivalvia; Pteriomorphia; Pectinoida;Pectinoidea; Pectinidae

NC_009081

Chlamys farreri

Bivalvia; Pteriomorphia; Pectinoida;Pectinoidea; Pectinidae

Crassostrea virginica

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_007175

Crassostrea gigas

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

EU672831

Crassostrea angulata

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_012648

Crassostrea sikamea

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_012649

Crassostrea hongkongensis

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_011518

Crassostrea ariakensis

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_012650

Crassostrea iredalei

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_013997

Saccostrea mordax

Bivalvia; Pteriomorphia; Ostreoida;Ostreoidea; Ostreidae

NC_013998