Retusa truncatula

The shell is minute with a flattened spire and longitudinal striations. The colour of the living animal is white. The adult length is usually less than 4 mm.[2]

This species occurs in South Africa, from False Bay to Durban in shallow estuaries. It is also known from northern Europe, the Mediterranean Sea and the Canary Islands.[2]

This small sea snail lives from the intertidal zone to just below the low water mark. It burrows in the mud or sand of tidal marshes, and feeds on foraminiferans.[2]

• Thiele J. (1925). Gastropoden der Deutschen Tiefsee-Expedition. II Teil. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899. 17(2): 35-382, pls 13-46
• Nordsieck, F. (1972). Die europäischen Meeresschnecken (Opisthobranchia mit Pyramidellidae; Rissoacea). Vom Eismeer bis Kapverden, Mittelmeer und Schwarzes Meer. Gustav Fischer, Stuttgart. XIII + 327 pp.
• Gosliner, T. 1987. Nudibranchs of southern Africa: A guide to Opisthobranch molluscs of southern Africa Sea. Challengers, Monterey.
• de Kluijver, M. J.; Ingalsuo, S. S.; de Bruyne, R. H. (2000). Macrobenthos of the North Sea [CD-ROM]: 1. Keys to Mollusca and Brachiopoda. World Biodiversity Database CD-ROM Series. Expert Center for Taxonomic Identification (ETI): Amsterdam, the Netherlands. ISBN 3-540-14706-3. 1 cd-rom.
• Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels. 50: pp. 180–213.
• Ceulemans, L.; Van Dingenen, F.; Landau B. M. (2018). The lower Pliocene gastropods of Le Pigeon Blanc (Loire-Atlantique, northwest France). Part 5 – Neogastropoda (Conoidea) and Heterobranchia (fine). Cainozoic Research. 18(2): 89-176.

• Bruguière J.G. (1789-1792). Encyclopédie méthodique ou par ordre de matières. Histoire naturelle des vers, volume 1. Paris: Pancoucke. Pp. i-xviii, 1-344
• Adams, J. (1800). Descriptions of some minute British shells. Transactions of the Linnean Society of London. 5(1): 1-6
• Maton, W. G. & Rackett, T. (1807). A descriptive catalogue of the British Testacea. Transactions of the Linnean Society of London. 8 (17): 17-250, 5 pls
• Brown, T. (1827). Illustrations of the conchology of Great Britain and Ireland. Drawn from nature. W.H. Lizars and D. Lizars, Edinburgh and S. Highley, London. 144 pp., 52 pls.
• Philippi, R. A. (1836). Enumeratio molluscorum Siciliae cum viventium tum in tellure tertiaria fossilium, quae in itinere suo observavit. Vol. 1. I-XIV, 1-303, Tab. XIII-XXVIII. Schropp, Berlin
• Monterosato, T. A. di. (1890). Conchiglie della profondità del mare di Palermo. Il Naturalista Siciliano. 9(6): 140-151 [March 1st, 1890; 9(7): 157-166]
• Locard, A. (1886). Prodrome de malacologie française. Catalogue général des mollusques vivants de France. Mollusques marins. Lyon: H. Georg & Paris: Baillière. x + 778 pp
• Pallary, P. (1904-1906). Addition à la faune malacologique du Golfe de Gabès. Journal de Conchyliologie. 52(3): 212-248, pl. 7 [25 October 1904; 54(2): 77-124, pl. 4]

Wikimedia Commons has media related to Retusa truncatula.