Gribble

Limnoriidae
Limnoria quadripunctata
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Isopoda
Superfamily: Limnorioidea
Family: Limnoriidae
White, 1850
Genera 
  • Limnoria Leach, 1814
  • Lynseia Poore, 1987
  • Paralimnoria Menzies, 1957
  • Phycolimnoria Menzies, 1957

A gribble (/ˈɡrɪbəl/) or gribble worm is any of about 56 species of marine isopod from the family Limnoriidae. They are mostly pale white and small (1–4 millimetres or 0.04–0.16 inches long) crustaceans, although Limnoria stephenseni from subantarctic waters can reach 10 mm (0.4 in).