Conulariids
Conulariids were a diverse extinct group of marine invertebrates that lived from the Cambrian to the Triassic periods. Their fossil remains are characterized by a distinctive, cone-shaped or pyramidal exoskeleton called a theca. This theca was typically composed of a chitinophosphatic material and often exhibited intricate surface patterns of zigzag lines or ribs. The overall shape ranged from slender and elongated to broad and squat.
The exact taxonomic placement of conulariids has been a subject of debate for many years. They were
Conulariids are found globally in marine sedimentary rocks. They likely lived in a variety of environments,