Emarginula undulata

This marine species is widely distributed along the continental margin of the western Indian Ocean, extending from the Gulf of Oman south to eastern South Africa, at depths ranging from 50 to 400 meters, with living specimens typically found between 75 and 120 meters. It was recently recorded in the Philippines (Poppe & Tagaro 2020) and has been found on the slopes of Walters Shoal (off Madagascar) at depths of 256–490 meters.^[4]

• Bosch D.T., Dance S.P., Moolenbeek R.G. & Oliver P.G. (1995). Seashells of eastern Arabia. Dubai: Motivate Publishing. pp. 1–296.{{cite book}}: CS1 maint: multiple names: authors list (link)
• Poppe G.T. & Tagaro S.P. (2020). "The Fissurellidae from the Philippines with the description of 26 new species". Visaya. suppl. 13: 1–131.

• Melvill, J. C. & Standen, R. (1903). "Descriptions of sixty-eight new Gastropoda from the Persian Gulf, Gulf of Oman, and North Arabian Sea, dredged by Mr. F. W. Townsend, of the Indo-European Telegraph Service, 1901–1903". Annals and Magazine of Natural History. 7 (12): 289–324. doi:10.1080/00222930308678859.{{cite journal}}: CS1 maint: multiple names: authors list (link)
• Herbert, D.G. (2015). "An annotated catalogue and bibliography of the taxonomy, synonymy and distribution of the Recent Vetigastropoda of South Africa (Mollusca)". Zootaxa. 4049 (1): 1–98. doi:10.11646/zootaxa.4049.1.1. PMID 26624772.
• Herbert D.G. & Kilburn R.N. (1986). "Taxonomic studies on the Emarginulinae (Mollusca: Gastropoda: Fissurellidae) of southern Africa and Mozambique. Emarginula, Emarginella, Puncturella, Fissurisepta, and Rimula". South Africa Journal of Zoology. 21 (1): 1–27. doi:10.1080/02541858.1986.11447951. hdl:10499/AJ19411.
• Biodiversity Heritage Library (3 publications)
• USNM Invertebrate Zoology Mollusca Collection
• World Register of Marine Species