Energon limpet

Energon limpets are an alien species from the Marvel portion of the Generation 1 continuity family.

Energon limpets are parasitic creatures native to the slime swamps of the planet Hydrus Four.

Fiction

"Another Time & Place"

Wading through the slime swamps of Hydrus Four in search of the cure for Nucleon, Grimlock listed having his energon sucked by limpets among the planet's less endearing features. Another Time & Place