Eocantharus latus was a small stout neogastropod with a whelk-like shell. Pisaniids and related buccinoids are active benthic predators or scavengers, moving across the substrate on a muscular foot and locating animal food chemically.

The shell combines axial ribs and spiral cords with a short anterior siphonal channel. That ornament and aperture separate it from smooth naticids and from much more slender auger snails.