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)表8：产自摩洛哥梅塞塔地块西迪阿马尔的阿尔恩斯贝格菊石属未定种（Arnsbergites sp.）壳体个体发育数据表。 壳径 壳体形态 旋环横截面形态 旋环扩张率 2 mm 厚锥形；外卷型（ww/dm ~ 0.75；uw/dm ~ 0.50） 极扁平；包裹度极高（ww/wh ~ 2.80；IZR ~ 0.35） 低（WER ~ 1.50） 8 mm 薄球形；半内卷型（ww/dm ~ 0.90；uw/dm = 0.15） 中等扁平；包裹度极高（ww/wh ~ 1.90；IZR ~ 0.60） 低（WER ~ 1.50） 17 mm 厚锥形；内卷型（ww/dm ~ 0.80；uw/dm = 0.08） 中等扁平；包裹度极高（ww/wh ~ 1.60；IZR ~ 0.60） 低（WER ~ 1.55）