Orthonychia parva (Swallow, 1858 in Shumard and Swallow). (A) SNSB-BSPG 2020 XCI 119, juvenile shell portion, Late Pennsylvanian Finis Shale Member, Graham Formation, North-central Texas. (A1) Lateral view, openly coiled protoconch well visible. (A2) Oblique anterior view. (A3) Oblique lateral view. (A4) Oblique apertural view. (A5) Openly coiled, smooth protoconch. (A6) Openly coiled, smooth protoconch in apical view and early teleoconch in lateral view. (A7) Openly coiled, smooth protoconch and early teleoconch. (B) From Bandel and Frýda 1999, pl. 2, figs 6, 8, Pennsylvanian Labette Shale, Saint Louis, Missouri, USA. (B1) lateral view, openly coiled protoconch well visible. (B2) Openly coiled protoconch well visible including initial bulb, straight and coiled parts followed by early teleoconch with so-marginal ribbing.