Figure 6 from: Glover EA, Taylor JD (2016) Pleurolucina from the western Atlantic and eastern Pacific Oceans: a new intertidal species from Curaçao with unusual shell microstructure (Mollusca, Bivalvia, Lucinidae). ZooKeys 620: 1-19. https://doi.org/10.3897/zookeys.620.9569

Figure 6 - Shell microstructure of other species Pleurolucina hendersoni, Pleurolucina undata, Lucina pensylvanica and Cardiolucina quadrata. A Pleurolucina hendersoni Guadeloupe, fractured section with prominent calcified conchiolin layer, periostracum at base. Scale bar = 20 µm B Pleurolucina hendersoni, detail of conchiolin layer with lines of calcareous spherulites. Scale bar = 20 µm C Pleurolucina undata Baja California, fractured section with thin conchiolin layer Scale bar = 200 µm D Pleurolucina undata, detail of conchiolin layer with spherulites. Scale bar = 20 µm E Pleurolucina undata, single spherulites embedded in conchiolin. Scale bar = 3 µm F Lucina pensylvanica Florida Keys, calcified conchiolin layer. Scale bar = 20 µm G Lucina pensylvanica, single spherulite. Scale bar = 2 µm H Lucina pensylvanica, section of periostracum with calcareous granules. Shell interior to top. Scale bar = 20 µm I Cardiolucina quadrata Philippines, fractured section with conchiolin layer. Scale bar = 200 µm J Cardiolucina quadrata detail of conchiolin layer with calcareous aggregates. Scale bar = 50 µm K Cardiolucina quadrata detail of calcareous aggregate. Scale bar = 10 µm.