Necklace Shell

The necklace shell-like preset models a smooth, globose gastropod inspired by necklace shells and other moon snails.

Characteristics:

• Rounded, dominant body whorl
• Low, visible spire
• Smooth surface without ribbing
• Overlapping whorls
• Broad aperture
• No internal chambering

The shell uses logarithmic spiral growth with proportional aperture expansion. Compared with more strongly spired forms, growth is concentrated into a broad final whorl which dominates the overall shell shape.

The model demonstrates how logarithmic spiral growth can produce a compact, inflated gastropod morphology through changes to aperture proportions, whorl overlap and axial growth.

Unlike the chambered cephalopod models, the necklace shell has no septa or siphuncle, reflecting its gastropod inspiration.