Invavita

Invavita piratica is an extinct, parasitic species of tongue worm, provisionally assigned to the order Cephalobaenida, from Ludlow-aged England. Despite the common name, tongue worms are actually highly modified crustacean arthropods closely related to barnacles and copepods, 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.
Etymology.
The generic name is a New Latin compound word combining ""invasor" and "avitus"," and roughly translates as "ancient intruder." The specific name refers to piracy; both names referring directly to the organism's obvious parasitic lifestyle.