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21 february 2019 18:01:57

 
Bilateral Jaw Elements in Amiskwia sagittiformis Bridge the Morphological Gap between Gnathiferans and Chaetognaths (Current Biology)
 


The interrelationships of chaetognaths, or arrow worms, have been a matter of a long-standing debate. Here, Vinther and Parry demonstrate that the Middle Cambrian Burgess Shale fossil Amiskwia possesses a chaetognath bodyplan, but a jaw apparatus reminiscent of gnathiferans. This suggests that chaetognaths belong to Gnathifera within Spiralia.


 
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