The Gomander is a recurring boss in the R-Type series. It is a huge Bydo-infected mass of flesh, which takes on the shape of a huge heart. It is inhabited by a snake-like creature, which can come from it's inside through the various tubes on the Gomander's body and also acts as it's main form of attack. It's weak spot is a small blue core on the top, which opens and closes sporadically.
In R-Type Final, you must enter he Gomander's inside in order to take it down, revealing that it's interior is indeed hollow.