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Amiskwia
Probably gelatin animal with no outer carapace.the head region bears a pair of tentacles, inserted on the front ventral surface. The trunk spots two fins, unsupported by rays or any other stiffening device, in the plane of body flattening- lateral and caudal(forming a tail ).
Amiskwia does not appear to be more closely related to any other phylum.
Reference
The Buggess Shale and the nature of History by Stephen Jay Gould
(P 151-152 )
.