Table 2 in The genus Discoceras (Tarphyceratida, Cephalopoda; Ordovician) from Estonia and glacial erratics in north-central Europe

Table 2. Parameters and ratios used for the description of the specimens of the genus Discoceras Barrande, 1867 studied herein. Parameter [unit]Abbrev.Calculationconch diameter [mm]dm–whorl height [mm]wh–whorl width [mm]ww–umbilical width [mm]uwdm1-wh1-wh2apertural height [mm]ahdm1-dm2imprint zone [mm]izwh1-ahwhorl expansion rate (outline)WERdm(dm /dm)2 1 2whorl expansion rate (apertural height)WERah[dm /(dm -ah)]2 1 1imprint zone rateIZRiz/whumbilical width indexUWIuw/dmconch width indexCWIww/dmwhorl width indexWWIww/wh