Nectocaris Pteryx drawing by Meg Nectocaris fossil photograph by unknown Nectocaris drawing by Apokryltaros

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Nectocaris Pteryx drawing by Meg
Nectocaris Pteryx drawing by Meg
Nectocaris is thought to be a pelagic (free swimming) creature rather then a benthic (floor living) which may explain why only one fossil has been discovered. If it normally lived in the water column above the ocean floor then it would be less likely to be caught up in mud slides.

This fascinating creature has what appear to be both an arthropod like shield behind the head and a chordate like tail. Although it is not certain which phyla it belongs to, it is thought to be more likely to be a relative of the chordates.

Image source Wikipedia