'Aquavirius Maggots! ...Dad said the Ministry were breeding —'
'No ...They're brains.'
-- Luna Lovegood and Hermione Granger, in the Department of Mysteries (OP35)
inA creature that was probably created by Luna Lovegood and/or Xenophilius Lovegood.
‘aqua’ = L. ‘water’ + possibly ‘virus’ = L. ‘slime, poison’; a maggot is a fly larva which eats decomposing flesh
From the Web
This is a cool little blurb about Aquavirius Maggots that includes an imagined artwork of the creature.