Fig. 6From: The oldest ammonoids of Morocco (Tafilalt, lower Emsian)Growth ornament and cross-section at 18 mm wh in the holotype of Praechebbites debaetsi n. gen. n. sp. a Strongly rursiradiate course of ornament. b Cross-section, showing the flattening of venter, flanks, and dorsal sideBack to article page