Here is a Conularia of the species Paraconularia ulrichana from the devonian of Bolivia
This  Conularia comes with the positive and negative side.
Conulariids are a in the triassic extinct animal group that systematically status is uncertain.
Today they are mostly associated to the scyphozoa (Jellyfish). In the past the Conulariids where also discussed as related to the chordata group.
The Conulariida are sill poorly understood.

Location: