Table 1 in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)

Table 1. Terminology for the description of the specimens of lituitid cephalopods.
Parameter [unit]AbbreviationCalculationconch diameter [mm]dmwhorl height [mm]whwhorl width [mm]wwumbilical width [mm]uwdm 1 -wh 1 -wh 2apertural height [mm]ahinterspace widthiw(dm 1 -dm 2 -wh 1)/wh1whorl expansion rate (outline)WERdm(dm /dm)2 1 2whorl expansion rate apertural height)WERah[dm /(dm -ah)]2 1 1umbilical width indexUWIuw/dmwhorl width indexWWIww/whangle of expansion [°]EA2*((arctangens(((d- max-dmin)/2)/h))*180)/πchamber length ratioCLRchamber length/whsiphuncule diameter [mm]sdsiphuncular diameter ratioSDRsd/whsiphuncle distance [mm]spsiphuncular position ratioSPRspr/wh