Figure 3 in Histology of ganoid scales from the early Late Cretaceous of the Kem Kem beds , SE Morocco : systematic and evolutionary implications

Figure 3. - Scales of Adrianaichthys pankowski (MNHN-Histos 1959). A: Cross section of a scale (transmitted natural light) showing two superimposed layers: pluristratified ganoine (black arrow), and basal plate (bp) constituted of an avascular bony tissue. Dentine is lacking; B-D: Cross sections of scales (transmitted natural light); B: Detail of pluristratified ganoine (g). In the underlying bony basal plate (bp) one can see canaliculi of Williamson (cw) and a growth mark (gm); C: Detail of the bony basal plate showing numerous Sharpey's fibres and two canaliculi of Williamson (arrow) and a growth mark (gm); D: Detail of the bony basal plate showing a dichotomy on a canaliculus of Williamson (arrowhead). Scale bars: A = 1 mm; B = 100 µm; C = 50 µm; D = 20 µm).