Appendix A. Collection localities, site IDs (corresponding to Fig. 2), number of snails dissected, parasite prevalence, and total parasite species encountered for the Pacific Cerithideopsis californica and the Atlantic C. pliculosa.

Collection localities, site IDs (corresponding to Fig. 2), number of snails dissected, parasite prevalence, and total parasite species encountered for the Pacific Cerithideopsis californica and the Atlantic C. pliculosa.