Shell apical angles of A. brunnea (Atlantic, Pacific and Indian oceans), A. vanderspoeli (Pacific Ocean) and A. turriculata (Pacific and Indian oceans) are significantly different and do not overlap.

 
 
  Part of: Wall-Palmer D, Hegmann M, Goetze E, Peijnenburg KTCA (2019) Resolving species boundaries in the Atlanta brunnea species group (Gastropoda, Pterotracheoidea). ZooKeys 899: 59-84. https://doi.org/10.3897/zookeys.899.38892