Limnoria Lignorum (Flabellifera)
Flabellifera are a tribe of isopods. Their bodies end in a tail fan, made by the last pair of appendages and the telson (end piece). While some species of this tribe are parasitic, this particular species, Limnoria Lignorum, is non-parasitic, and has a destructive action on submerged wood. It is commonly referred to as the ‘gribble’.
John H. Finley ed. Nelson's Perpetual Loose-Leaf Encyclopaedia (vol. 5) (New York, NY: Thomas Nelson and Sons, 1917)