[<< wikipedia] Pupillaea aperta
Pupillaea aperta, common name the mantled keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.

== Description ==
The size of the shell varies between 23 mm and 50 mm.

== Distribution ==
This marine species occurs off Namibia to North Transkei, South Africa.

== References ==

Kilburn, R.N. & Rippey, E. (1982) Sea Shells of Southern Africa. Macmillan South Africa, Johannesburg, xi + 249 pp. page(s): 36
Steyn, D.G. & Lussi, M. (1998) Marine Shells of South Africa. An Illustrated Collector’s Guide to Beached Shells. Ekogilde Publishers, Hartebeespoort, South Africa, ii + 264 pp. page(s): 12
Petit R.E. (2009) George Brettingham Sowerby, I, II & III: their conchological publications and molluscan taxa. Zootaxa 2189: 1–218.

== External links ==
"Fissurellidea aperta". Gastropods.com. Retrieved 16 January 2019.
Branch, G.M. et al. (2002). Two Oceans. 5th impression. David Philip, Cate Town & Johannesburg