In contrast, they could not develop posterior spines at 30 °C. In the LS clone, all offspring have long posterior spines which do not differ at different temperatures (P > 0.05) and there is no correlation between posterior spine length and
temperature (r = 0.008, P = > 0.01). Photographs of offspring of SS and LS clones at 20, 25 and 30 °C are shown in Figure 4.