FIGURE 4. A in Turritellidae (Gastropoda) of the Miocene Paratethys Sea with considerations about turritellid genera

FIGURE 4. A. Measurements and ratios to classify lateral sinus morphology (LS° = lateral sinus angle, LSp = lateral sinus position, LSd = lateral sinus depth). B. Classification of lateral sinus angles; grey area represents angles documented in Paratethyan Turritellidae. C. Notation system for describing spiral cords in turritellids: A, B, C, d = primary spiral cords, r, s, t, u = secondary spiral cords (adopted from Allmon 1996).