ammonites
Phestia wortheni Hoare et al. 1989 (pointed nut clam)

Bivalvia - Protobranchia - Nuculanidae

Full reference: R. D. Hoare, M. J., I.I.I. Heaney, and R. H. Mapes. 1989. Bivalves (Mollusca) from the Imo Formation (Mississippian, Chesterian) of North-Central Arkansas. Journal of Paleontology 63(5):582-603

Belongs to Phestia according to R. D. Hoare et al. 1989

Sister taxa: Phestia basedowi, Phestia corrugata, Phestia darwini, Phestia elongata, Phestia hunanensis, Phestia inflatiformis, Phestia lusabaensis, Phestia nova, Phestia obtusa, Phestia pandoraeformis, Phestia perumbonata, Phestia rugodorsata, Phestia sinuata, Phestia speluncaria, Phestia subacuta, Phestia thompsoni, Phestia zhejiangensis

Type specimen: Its type locality is Loc. 1. USGS 14369. Road cut on se side US 65, 0.8 km sw of Peyton Creek Bridge, which is in a Serpukhovian offshore grainstone/shale in the Imo Formation of Arkansas.

Ecology: facultatively mobile infaunal deposit feeder-suspension feeder

Average measurements (in mm): shell 13.0 x 7.1