Scanning electron microscope image of rim and interior of Archaias angulatus pseudopores. Image on left is from a specimen that was cultivated for six weeks in seawater with pH 7.6 (treatment); image on right is from a specimen that was cultivated for six weeks in seawater with pH 8.0 (control). Note deterioration of pseudopore rim (1) and dissolution of calcite rods (2) in pH 7.6 sample.