A. Shell of Ondina hendersoni, holotype (USNM 203813) in apertural view; B. same, in lateral view. C. Shell of Ondina stocki, holotype (ZMA.MOLL. 138319) in apertural view [photo: Naturalis, Jeroen Goud. D. Ondina stocki, paratype (ZMA.MOLL. 138320), smaller shell in apertural view; E. same, bigger shell in apertural view. Scale bar: 1 mm.

 
 
  Part of: Pimenta A, Santos F, Cunha C (2018) Reassignment of Acteon semicingulatus to the Pyramidellidae, with review of the occurrence of Ondina and Evalea in the Western Atlantic (Gastropoda). Zoosystematics and Evolution 94(2): 1-10. https://doi.org/10.3897/zse.94.28765