Speleogobius llorisi has a relatively elongated body which is laterally compressed, and it has a narrow peduncle to the caudal fin.

The opercle and area in front of the pelvic fin are orange red.

[1] Speleogobius llorisi was described from specimens collected off the south west coast of the Balearic island of Mallorca in the western Mediterranean.

It was collected from depths between 40–70 metres (130–230 ft) among beds of red algae dominated by species in the family Peyssonneliaceae, in areas sheltered from significant currents.

[1][2] The specific name honours the ichthyologist Domenec Lloris of the Institut de Ciències del Mar in Barcelona, in recognition of his “outstanding” contribution to the science of ichthyology.