Geophilus sounkyoensis is a species of soil centipede in the family Geophilidae.

[3] He based the original description of this species on specimens that included both sexes.

[2][3] These specimens were found in the Sounkyo area on the island of Hokkaido in Japan.

[2][4] Since the discovery of this species, this centipede has also been recorded in the Maritime territory (Primorsky Krai) of the Russian Far East.

[4] The terminal element of the second maxillae is like a claw that is longer than the surrounding setae.

Furthermore, the ventral pore-field is shaped like a diamond (that is, a rhombus) in G. rhomboideus but has a straight anterior margin in G. sounkyoensis.

Moreover, the isolated pore on the ultimate legs is relatively large in G. sounkyoensis but relatively small in G.