ammonites
Girtyspira microspirula Jeffery et al. 1994 (snail)

Gastropoda - Prosobranchia - Meekospiridae

Full reference: D. L. Jeffery, R.D. Hoare, R.H. Mapes and C.J. Brown. 1994. Gastropods (Mollusca) from the Imo Formation (Mississippian, Chesterian) of north-central Arkansas. Journal of Paleontology 68(1):58-79

Belongs to Girtyspira according to D. L. Jeffery et al. 1994

Sister taxa: Girtyspira alvaensis, Girtyspira canaliculata, Girtyspira delicata, Girtyspira fusiformis, Girtyspira germanica, Girtyspira inflata, Girtyspira lineata, Girtyspira mediocris, Girtyspira micra, Girtyspira minuta, Girtyspira pygmaea, Girtyspira yodai

Type specimen: USNM 463930, a shell. 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: epifaunal

Average measurements (in mm): shell 2.20 x 1.00