These
 gruesome creatures are capable of turning their mouths inside out and 
dragging themselves around by their tooth-lined throat.
Now
 scientists have found that these bizarre dental structure could be key 
in helping find previously unknown penis worm species from all over the 
world.
Since
 penis worms are among the first-ever predators, discovery of new 
species is important for helping scientists understand how animal life 
on Earth developed.
Reconstructing
 the teeth of penis worms, or priapulids, in fine detail has enabled 
researchers to compile a 'dentist's handbook' of the species. 

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