Table 73 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Table 73. Conch ontogeny of Gattendorfia schmidti sp. nov. from Oberrödinghausen. dmconch shapewhorl cross section shapewhorl expansion2 mmthickly discoidal; evolute (ww/dm ~0.50; uw/dm ~0.50)moderately depressed; moderately embracing (ww/wh ~1.90; IZR ~0.15)low (WER ~1.60)5 mmthinly discoidal; evolute (ww/dm ~0.40; uw/dm ~0.60)moderately depressed; moderately embracing (ww/wh ~1.80; IZR ~0.15)low (WER ~1.55)15 mmthickly discoidal; subevolute (ww/dm ~0.50; uw/dm ~0.40)moderately depressed; strongly embracing (ww/wh ~1.75; IZR ~0.30)low (WER ~1.70)30 mmthickly discoidal; subinvolute (ww/dm ~0.50; uw/dm ~0.25)weakly depressed; strongly embracing (ww/wh ~1.25; IZR ~0.40)moderate (WER ~1.80)30 mmthinly discoidal; subinvolute (ww/dm ~0.42; uw/dm ~0.20)weakly compressed; strongly embracing (ww/wh ~0.90; IZR ~0.40)moderate (WER ~1.85)表73 产自奥伯勒丁豪森（Oberrödinghausen）的新种加滕多夫菊石（Gattendorfia schmidti sp. nov.）的壳体个体发育特征。 各生长阶段的壳体参数如下： 1. 壳径2 mm：壳体呈厚盘形，为外旋型（evolute），螺环宽（whorl width, ww）/壳径≈0.50、脐宽（umbilical width, uw）/壳径≈0.50；螺环横截面呈中等背腹扁缩；相邻螺环适度包卷，ww/wh≈1.90、脐部指数（IZR）≈0.15；螺环扩张率（whorl expansion rate, WER）较低，约为1.60。 2. 壳径5 mm：壳体呈薄盘形，为外旋型（evolute），ww/dm≈0.40、uw/dm≈0.60；螺环横截面呈中等背腹扁缩；相邻螺环适度包卷，ww/wh≈1.80、IZR≈0.15；螺环扩张率较低，约为1.55。 3. 壳径15 mm：壳体呈厚盘形，为亚外旋型（subevolute），ww/dm≈0.50、uw/dm≈0.40；螺环横截面呈中等背腹扁缩；相邻螺环强烈包卷，ww/wh≈1.75、IZR≈0.30；螺环扩张率较低，约为1.70。 4. 壳径30 mm：壳体呈厚盘形，为亚内旋型（subinvolute），ww/dm≈0.50、uw/dm≈0.25；螺环横截面呈弱背腹扁缩；相邻螺环强烈包卷，ww/wh≈1.25、IZR≈0.40；螺环扩张率中等，约为1.80。 5. 壳径30 mm：壳体呈薄盘形，为亚内旋型（subinvolute），ww/dm≈0.42、uw/dm≈0.20；螺环横截面呈弱侧扁；相邻螺环强烈包卷，ww/wh≈0.90、IZR≈0.40；螺环扩张率中等，约为1.85。