Accordiaulus, more commonly called bellowshells, somewhat resemble nautiloid mollusks in shape and coloration: they are pony-sized invertebrates with cream-colored skin and shells accented with rust stripes that densen farther up. They have sideways pear-shaped bodies ending in rings of cirri around a fanged, radial mouth and supported by two pairs of crablike legs placed just below several large, dark eyes.