Table 8 in Late Viséan (Mississippian) ammonoids (Cephalopoda) from the Central Moroccan Meseta

Table 8. Conch ontogeny of Arnsbergites sp. from Sidi Amar (Moroccan Meseta). dmconch shapewhorl cross section shapewhorl expansion2 mmthickly pachyconic; evolute (ww/dm ~ 0.75; uw/dm ~ 0.50)very strongly depressed; widely embracing (ww/wh ~ 2.80; IZR ~ 0.35)low (WER ~ 1.50)8 mmthinly globular; subinvolute (ww/dm ~ 0.90; uw/dm = 0.15)moderately depressed; extremely embracing (ww/wh ~ 1.90; IZR ~ 0.60)low (WER ~ 1.50)17 mmthickly pachyconic; involute (ww/dm ~ 0.80; uw/dm = 0.08)moderately depressed; extremely embracing (ww/wh ~ 1.60; IZR ~ 0.60)low (WER ~ 1.55)