This shell is globular with a subcircular outline. The two valves viewed from the side are heart shaped, forming the outline of a human heart (hence the original species name, Cardium humanum). They are quite thin, equivalve, with a light weight. The outer surface usually is dark brown or olive green, with fine radial lines and frequently covered with short hairs. Glossus humanus lives half buried into the substratum, exposing only the lower margin of the shell and the siphon. It feeds on plankton and other microscopic particles that it filters out with their gills. Spawning occurs at the end of September.