Table 6 in Morphometric analysis of Eocene nummulitids in western and central Cuba: taxonomy, biostratigraphy and evolutionary trends

Table 6. Characters and attributes (means and standard deviations, SD, in mm) for Operculinoides and comparisons with Nummulites and Palaeoummulites. Symbol key: ++, strong positive differences with <1% error probability; 0, no significant differences; ――, strong negative differences with <1% error probability. OperculinoidesMeanSDPalaeonummulitesNummulitesFirst chamber length369.0165.69++0Proloculus nominal diameter146.367.080――Deuteroloculus ratio1.1660.1684++++Initial marginal radius192.088.590――Marginal radius increase0.1260.01910++Spiral chamber height increase2.81.15++――Initial spiral chamber height62.532.840――Backbend angle0.6360.11200++Initial chamber length224.0126.60++0Chamber length increase0.0480.02200++Perimeter ratio1.3920.11300++