Feelertongues or Terrortongues, how some scientists call them, are very small pseudoathropods which are near relatives of sicagnathids th05.deviantart.net/fs71/200H/…
They very diverse, with 20 genera and 70 species. These are the most common species which can be found nearly everywhere on Silvanus.
They live within the roots of the Mundodendralus trees where they hunt small invertebrates. These roots are full of natural grown tunnels which make the trees much lighter but it's also one of the weakest points of the plants, that's the reason for a huge diversity of parasites which feed on the root juice. Therefor the Diplolinguidae are a important part of the silvanian fauna because they keep the populations of parasites small.
p.s. The "feelers" are atually the two tongues which every pseudothropod has, in this case they became extremely long and work as tactile organs and grapping tools