Teichaster stokesii was a goniasterid sea star with a comparatively rigid, plated body. Goniasterids are benthic animals that move slowly over the sea floor and feed on small invertebrates, carrion or encrusting organisms; a comparable predatory-scavenging role is reasonable for the Eocene species.

The skeleton comprised robust marginal and body ossicles. As soft tissues decayed these plates separated, so isolated marginals are much more likely to be collected than an intact star. Their shape and sculpture preserve information about the original broad, armoured body outline.