Tags: Crustacean.
Pentastomida are an enigmatic group of parasitic invertebrates commonly known as tongue worms due to the resemblance of the species of the genus Linguatula to a vertebrate tongue.There are about 130 extant species of pentastomids; all are obligate parasites with correspondingly degenerate anatomy. Adult tongue worms vary from about 1 to 14 centimetres (0.4 to 5.5 in) in length and parasitise the respiratory tracts of vertebrates. They have five anterior appendages.
