Shockirus are the minor antagonists in the 1984 Godzilla movie, The Return of Godzilla. They are the mutated sea louse kaiju that were unwittingly unleashed when Godzilla emerged from the ocean to invade the human world.
Shockirus resembles the enlarged marine insects which looked like a horseshoe crabs with multiple legs and hard shells. Their shells are filled bumps and have the two-pronged, spiked tails.
In the manga, they looked like a giant cockroachs.