Orthonychia parva (Swallow, 1858 in Shumard and Swallow), SNSB-BSPG 2020 XCI 117, juvenile specimen with uncoiled, hook-like protoconch (same as Fig. 9A4); Late Pennsylvanian Finis Shale Member, Graham Formation, North-central Texas. I–III smooth protoconch consisting of initial bulb formed within the egg (I), straight part of larval shell (II) coiled part of larval shell (III) first portion of teleoconch with strong ribbing (IV) second portion of teleoconch with rapidly widening (V).