Pseudonotoliparis rassi, or Rass' snailfish, is a species of snailfish native to the northwestern Pacific Ocean where it is known from the Boussole Strait in the Kuril Islands. This species has been found at a depth of 2200m (7,200feet). This species grows to a length of 8.8cm (03.5inches) SL. This species is the only known member of the monospecific genus Pseudonotoliparis.