Figure 5

Aragonite co-orientation strength in the scleritome and in individual sclerites of A. gorgonophila, D. sarsii and S. margaritacea (A–C). We present color-coded Kernel misorientation maps, calculated from EBSD measurements. These give, in color, the degree of misorientation between neighboring crystals; the used color-code is given below the corresponding relative frequency—misorientation diagram. Maximal misorientation for portions of the scleritome (for an entire EBSD scans) ranges up to 3°. For individual sclerites maximal misorientation scatters between 1° and 2°. Most co-oriented are aragonite crystallites in the sclerites of S. margaritacea (C). Slightly less co-oriented is the aragonite that comprises the sclerites of A. gorgonophila (A) and D. sarsii (B). At maximal frequency, the misorientation values for individual sclerites are 0.45° and 0.7° for A. gorgonophila and D. sarsii, respectively. For S. margaritacea, at maximal misorientation, the misorientation between crystallites is as low as 0.2°–0.25°.