What is "invavita"

Invavita piratica is an extinct, parasitic species of tongue worm, provisionally assigned to the order Cephalobaenida. Despite the common name, tongue worms are actually highly modified arthropods, not worms; the Pentastomida are obligate parasites. It possessed a head, a worm-like body, and two pairs of limbs.

The 425-million-year-old Silurian fossil holotype specimen was found still attached to its fossilised host, a specimen of the ostracod Nymphatelina gravida, at an undisclosed location in England. It is now in Oxford University Museum of Natural History. It was first described in the journal Current Biology in 2015.