Fig. 6
From: Interpreting drag consequences of ammonoid shells by comparing studies in Westermann Morphospace
Shell shape data from Smith et al. (2014), spanning the Late Triassic to Middle Jurassic are shown in Westermann Morphospace. Designations of stages into “Pre-Extinction”, “Aftermath”, “Post-Extinction”, and “Recovery” intervals following the interpretations of Smith et al. (2014). a “Pre-Extinction” ammonoid faunas from the Late Triassic (Carnian—Rhaetian; ~34 Myr) represented by 166 specimens of 151 genera. A Carnian specimen of Pompeckjites has a thickness ratio of 13 %, causing it to plot just outside the focus morphospace. b “Aftermath” ammonoids from the Hettangian (~1.8 Myr; Schaltegger et al. 2008; Schoene et al. 2010) stage of the Early Jurassic represented by one specimen from each of 42 genera. A specimen of Laqueoceras has a thickness ratio of 11 %, causing it to plot just outside the focus morphospace. c “Post-Extinction” ammonoids of the Sinemurian—Aalenian (~28 Myr) represented by 301 specimens from 271 genera. d “Recovery” ammonoids from the remaining Middle Jurassic (Bajocian—Callovian; ~11 Myr) represented by 138 specimens of 137 genera. A Callovian specimen of Petitclercia has a thickness ratio of 12 %, causing it to plot just outside the focus morphospace