Fig. 8From: Another lesson from beautiful monsters: the case of 'sex reversals' in the Ammonoidea and their significanceIllustration of female-to-male “sex-reversals” in the Perisphinctoidea: A the Kimmeridgian dimorphic Perisphinctidae Subnebrodites (pro Idoceras) planula (Hehl). Typical [m] and [M] are from Schweigert and Kuschel [48] and the “forma hermaphrodita” is from Brochwicz-Lewiński and Różak [19], and doubtfully (B) the Oxfordian Perisphinctidae dimorphic pair Microbiplices [m]—Ringsteadia [M]. All specimens are from Sykes and Callomon [26]. In both cases, the putative “forma hermaphrodita” individuals have the shell features of the [M] but they bear a lappeted peristome typical of the [m]. Specimens are figured using the original scaleBack to article page