Geophilus algarum is a species of centipede in the family Geophilidae found in the littoral zone on the French Atlantic and Channel Coasts.

decipiens, which can be identified by lack of a dorsal coxal pore.

[3] The male of this species has 53 pairs of legs; females have 53 to 59.

[4] G. algarum shares several characteristics with both G. fucorum and G. gracilis, leading some to believe that the three are a single polytypic species consisting of highly individual subspecies.

G. algarum is differentiated from the other two centipedes by having two labral teeth, a clear clypeal area, 8–12 prehensorial teeth, three ventral (posterior) and one dorsal coxal pore, and a well-developed claw of the anal leg.