Shape of the Body Whorl

For a due description of the shape of the Body Whorl it is possible to consider some parameters. The Relative Diameter and the Position of Maximum Diameter are utilized for this purpose.
An overall judgment regarding the outline of the body whorl is useful too.

md = maximum diameter

mdh= maximum diameter height

ah = aperture height

Relative Diameter
RD = md/ah

Position of Maximum Diameter PMD = md/mdh


Broadly conical PMD > 0.85 RD > 0.7 capitaneus	Conical PMD > 0.85 0.7 ≥ RD ≥ 0.5 recurvus	Narrowly conical PMD > 0.85 RD < 0.5 vimineus	Broadly-Ventricosely Conical 0.85 ≥ PMD ≥ 0.75 RD > 0.7 betulinus

Ventricosely conical 0.85 ≥ PMD ≥ 0.75 0.7 ≥ RD ≥ 0.5 fulmen f. kirai	conical/cylindrical 0.85 ≥ PMD ≥ 0.75 0.7 ≥ RD ≥ 0.5 striatus f. subfloridus	Narrowly conical/cylindrical 0.85 ≥ PMD ≥ 0.75 RD < 0.5 australis	Broadly ovate PMD < 0.75 RD > 0.7 patricius

Ovate PMD < 0.75 0.7 ≥ RD ≥ 0.5 bullatus	Cylindrical PMD < 0.75 0.7 ≥ RD ≥ 0.5 tulipa	Narrowly ovate PMD < 0.75 RD < 0.5 dusaveli	Narrowly cylindrical PMD < 0.75 RD < 0.5 nussatella


Convex textile	Straight voluminalis

Concave pulcher	Sigmoid pagodus