Close-up of a conularid from the Mississippian of Indiana; scale in mm
Conularids (Phylum Conulariida) are conical-shaped, extinct marine invertebrates that have been placed, after much debate, in their own phylum. They are found in Silurian through Middle and Upper Paleozoic marine rocks in Ohio. The exoskeleton is phosphatic and characterized by numerous, closely spaced, horizontal ridges. Most specimens are small but some reached lengths of nearly 12 inches. They are most common in rocks of Mississippian age.
- Babcock, L. E., 1996. "Phylum Conulariida," in Fossils of Ohio, edited by R. M. Feldmann and Merrianne Hackathorn. Ohio Division of Geological Survey Bulletin 70, p. 66-69.