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Guttulina communis sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 72
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Guttulina austriaca sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 73
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Image source: Cushman, J.A. 1933. The Foraminifera of the Tropical Pacific Collections of the ”Albatross”. Part 2. Lagenidae to Alveolinellidae. Bull. U.S. Nation. Mus 161: vi+79 pp.+19 pls.
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Guttulina communis sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 73
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Northland, Cavalli Islands, 41 m depth, Plate 7 in Hayward, B.W., Grenfell, H.R., Reid, C.M., Hayward, K.A. 1999. Recent New Zealand shallow-water benthic Foraminifera: Taxonomy, ecologic distribution, biogeography, and use in paleoenvironmental assessment. Institute of Geological and Nuclear Sciences Monograph 21, 258 p.
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Le Calvez, Y. (1970). Contribution à l'étude des Foraminifères paléogènes du Bassin de Paris. Éditions du Centre national de la recherche scientifique. page(s): p. 91 pl. 17 fig. 7
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Guttulina ovata sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 72
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Fornasini, C. (1901). Intorno a la nomenclatura di alcuni nodosaridi neogenici italiani. Memorie della Reale Accademia delle Scienze dell'Istituto di Bologna. 5(9) [1901-1902]: 45-76., available online at
http://www.biodiversitylibrary.org/item/120183#page/79/ page(s): p. 70 tf. 22