Fig. 9 in Dimorphism in Late Cretaceous ammonites- evidence from early Turonian ammonite faunas of the Briessnitz Formation in Saxony, Germany

Fig. 9. Acanthoceratid ammonoid Spathites (Jeanrogericeras) reveliereanus (Courtiller, 1860) MMG: SaK 16896 from the lower Turonian of the Briessnitz Formation, Leubnitz, Germany. A. Outer whorl in ventral (A1), lateral (A2), and apertural (A3) views; the fracture at which the outer whorl separates from the inner whorl (arrow) and an umbilical tubercle (UT) are marked. B. Inner whorl in lateral (B1, B3) and apertural (B2) views; the umbilical tubercle (UT) and the position of the fracture shown in A2 are marked by arrow.图9 产自德国洛伊布尼茨（Leubnitz）布里施尼茨组（Briessnitz Formation）土仑阶早期的MMG馆藏编号为SaK 16896的棘菊石科（Acanthoceratid）菊石Spathites (Jeanrogericeras) reveliereanus (Courtiller, 1860)。A. 分别为腹视（A1）、侧视（A2）与口视（A3）下的外旋环；图中标注了外旋环与内旋环分离处的结合缝（箭头指示）以及一枚脐瘤（umbilical tubercle，UT）。B. 分别为侧视（B1、B3）与口视（B2）下的内旋环；图中以箭头标注了脐瘤（UT）以及图A2中所示结合缝的位置。