Figure 11 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)

Figure 11. Axial cross-sections of the columnals, and distal end of basals of Guillecrinus neocaledonicus. (a–c) Axial cross-sections of specimen N6: (a) columnal 4; (b) columnal 13; (c) distal columnal, showing the growth in diameter of the axial canal by resorption of the perilumen stereom (arrows). (d) Distal facet of a basal of adult specimen N6. (e) Distal facet of a basal of juvenile specimen N5. Dp, ligamentary depression; ca, axial canal; a, galleried stereom; b, labyrinthic stereom. Scale bars: 1 mm (a–c); 0.5 mm (d, e).