Fig. 2 in The Barremian heteromorph ammonite Dissimilites from northern Italy: Taxonomy and evolutionary implications

Fig. 2. Dimensions and terms used in Dissimilites intermedius sp. nov. from Puez, based on the holotype, the most entire specimen (NHMW 2012/0002/0001). α, angle of retroversum; β, angle formed by pro- and retroversum; γ, open angle on inner side of proversum; δ, angle at end of proversum.