Zipped folder containing virtual models (in .STL format) of theoretical ectocochleate cephalopods (oxycone, serpenticone, sphaerocone, and morphospace center). There are four components of each model used in hydrostatic calculations: 1) shell, 2) chambers (camerae), 3) soft body, and 4) water displaced. Each near-endmember morphotype has two versions: 1) Body chamber lengths allowing neutral buoyancy with Nautilus-like chamber liquid (~12%), and 2) Body chamber lengths of the representative specimens used to build the models (Sphenodiscus for oxycone, Dactylioceras for serpenticone, and Goniatites for sphaerocone).