Fossil Record
Exceptionally preserved, three dimensional and phosphatised fossils from the Upper Cambrian Orsten of Sweden and the Cambrian/Ordovician boundary of Canada have been identified as pentastomids. Four fossil genera have been identified so far: Aengapentastomum, Bockelericambria, Haffnericambria and Heymonsicambria. These fossils suggest that pentastomids evolved very early and raise questions about whether these animals were parasites at this time, and if so, on which hosts. Conodonts have sometimes been mentioned as possible hosts in this context.
Read more about this topic: Tongue Worms
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