Shockirus resembles marine arthropods like the horseshoe crab with its multiple legs and hard shell. Its shell has many bumps, and it has a two-pronged spike tail.
In the The Return of Godzilla manga, the Shockirus look like giant cockroaches.
Shockirus first appeared when he attacked a fishing boat in The Return of Godzilla, where he killed the crew but left one survivor. He was killed by the survivor with a hatchet when he attacked a reporter called Goro who tried to get on the boat.
Shockirus are extraordinary jumpers, and also can suck vital fluids out of a host. Their hard carapace also protects them from harm.
Shockirus appears in the Dark Horse Godzilla comics where it attacks Kino and Take' when they climb up Godzilla. A creature resembling Shockirus appears very briefly in IDW's Godzilla: Rulers of Earth #1.
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