Table 5 in Late Viséan (Mississippian) ammonoids (Cephalopoda) from the Central Moroccan Meseta

Table 5. Conch ontogeny of Goniatites sphaericus (Sowerby, 1814) from Sidi Lamine. dmconch shapewhorl cross section shapewhorl expansion2 mmspindle-shaped; subinvolute (ww/dm ~ 1.10; uw/dm ~ 0.20)strongly depressed; very strongly embracing (ww/wh ~ 2.30; IZR ~ 0.55)low to mod. high (WER = 1.60–1.80)8 mmthickly globular to spindle-shaped; involute (ww/dm = 0.95– 1.10; uw/dm = 0.05)moderately to strongly depressed; extremely embracing (ww/wh = 1.80–2.20; IZR ~ 0.60)low (WER = 1.50–1.60)20 mmthickly pachyconic to thinly globular; involute (ww/dm = 0.80–0.95; uw/dm ~ 0.10)moderately depressed; extremely embracing (ww/wh ~ 1.90; IZR ~ 0.60)low (WER ~ 1.50)40 mmpachyconic; involute (ww/dm = 0.65–0.80; uw/dm ~ 0.15)moderately depressed; extremely embracing (ww/wh ~ 1.55; IZR ~ 0.60)low (WER ~ 1.50)表5 产自西迪拉明（Sidi Lamine）的球形棱菊石（Goniatites sphaericus，Sowerby, 1814）的壳体个体发育 壳径2 mm：壳体形态呈纺锤形；半外卷（ww/dm≈1.10；uw/dm≈0.20）；螺环横截面形态为强烈扁平；极宽包卷（ww/wh≈2.30；IZR≈0.55）；螺环扩展率低至中等偏高（WER=1.60–1.80） 壳径8 mm：壳体形态呈厚球状至纺锤形；内卷（ww/dm=0.95–1.10；uw/dm=0.05）；螺环横截面形态为中等至强烈扁平；极宽包卷（ww/wh=1.80–2.20；IZR≈0.60）；螺环扩展率低（WER=1.50–1.60） 壳径20 mm：壳体形态呈厚粗锥状至薄球状；内卷（ww/dm=0.80–0.95；uw/dm≈0.10）；螺环横截面形态为中等扁平；极宽包卷（ww/wh≈1.90；IZR≈0.60）；螺环扩展率低（WER≈1.50） 壳径40 mm：壳体形态呈粗锥状；内卷（ww/dm=0.65–0.80；uw/dm≈0.15）；螺环横截面形态为中等扁平；极宽包卷（ww/wh≈1.55；IZR≈0.60）；螺环扩展率低（WER≈1.50）