Fig. 1.

Survey of extant curved-rod morphologies, with geometric parameters and definitions of dimensionless shape parameters $\mathrm{ℒ}$ and $\mathrm{𝒦}$ (Inset). The circles represent species median shapes based on segmented images, with circle radius proportional to equivalent spherical diameter (ESD) when scale data available (filled) or overall median ESD when not (open). The smallest ellipse containing 50% of all species is shown in red, and overall median species shape (and ESD) is depicted by a red filled circle, highlighted by a triangle. Silhouetted individuals (green), rescaled to constant volume, are shown for selected species (green filled circles).