G. tungshengi is known from a single specimen which is nearly complete and has traces of soft tissue preserved. With a total length reaching , it had large spines on two dorsal fins, a feature seen in other hybodontiform sharks, as well as two pairs of cephalic spines with retrorse barbs. The dorsal spines were found to be covered in placoid scales, as well. Although its classification is still uncertain,
Gansuselache is tentatively placed in the family
Lonchidiidae on the basis of its tooth morphology. The teeth themselves measure up to 3 mm long, though the tooth base is shorter and deeper than the crown. The crown/root junction on each tooth is at its highest on the labial (lip) side of the tooth, but the overall profile of each tooth is low. Each tooth has a short, slightly pyramid shaped central cusp and up to two pairs of lateral cusplets flanking the central cusp. The closest pair of lateral cusps is well-separated from the main cusp. All cusps on the teeth of this genus are ornamented by vertical ridges across the crown that do not bifurcate. These ridges begin at crown apexes and descend down to the crown's shoulder which is weakly developed compared to the teeth of other hybodontiform genera. There is also a thin horizonal ridge which runs along the crown in the direction of the tongue. == Paleoecology ==