Megadeth – Holy Wars…The Punishment Due (live at Woodstock 99) [Thrash Metal] Like this:Like Loading... Post navigation On the hunt…TIL that the largest isopod ever reported and proven to exist was 50 cm (19.7 in) long, belonging to the species Bathynomus giganteus. In 2010, there was a report of one 76 cm in length, but it was left unconfirmed.