It is distinguished by its larger size, less discoidal shape, greater convexity beneath, more elevated spire, obsolete keel, deeply impressed suture, and much coarser, more abrupt, and prominent ribs above, resembling, in the latter respect and in the abrupt ending of the ribs at the obsolete keel or angle of the last whorl, Janulus calathus (R. T. Lowe, 1852) (taxon inquirendum) or Janulus bifrons (R. T. Lowe, 1852).

[3] In 2008, reserve warden Isamberto Silva and biologist Dinarte Teixeira rediscovered living populations of Atlantica calathoides on the island Deserta Grande.

[4] Atlantica calathoides were one of the target species of the LIFE Recover Natura Project which ran from October 2013 to March 2019.

[4] During the project, new populations of Atlantica calathoides were identified and the species' conservation status was evaluated.

[8] In recent decades, there has been a continued control programme for goat populations which should assist with habitat restoration.