I apologise that this is not the best possible reproduction of an image. In my defense, it is quite possible that even in the original publication the image quality was poor.
The organism shown grew to just under 8 mm in height, and dates to the Albian epoch of the early Cretaceous.
Oh, and it's only fair to give you all a warning: in the past, I've put up what turned out to be some pretty evil ID challenges. I think I can safely say, however, that this is my most evil challenge yet. Any other challenge I have put up, no matter how evil, was but a room full of fluffy white kittens paddling their paws in pink marshmallow compared to this challenge. If this challenge came across a fluffy white kitten and a bowl of pink marshmallow, it would use the marshmallow to drown the kitten. This challenge feasts on the flesh of virgins while bathing in their blood and idly drawing pentagrams alongside its pool. Rumour even has it that this challenge played a significant role in the chart success of Hear'Say. Seriously, though, if you enter the name of this challenge into Google, you will get one result, and that's the original description from whence these figures are taken.
Attribution, as always, to follow.
Update: Identity now available here. Figure from Korde (1975).
4 hours ago in Variety of Life