original description
(of Textularia variabilis var. difformis Williamson, 1858) Williamson, W.C. (1858). On the recent Foraminifera of Great Britain. <em>The Ray Society, London.</em> 1-107., available online at https://archive.org/details/onrecentforamini00will/page/n0
page(s): p. 77, pl. 6, figs. 166, 167 [details] 
context source (Deepsea)
Murray, J.W. (2006). Ecology and applications of benthic foraminifera. <em>Cambridge, UK, Cambridge University Press.</em> 426pp., available online at http://www.cambridge.org/9780521828390 [details] Available for editors
[request]
context source (WoRCS)
Romano, E.; Bergamin, L.; Di Bella, L.; Frezza, V.; Marassich, A.; Pierfranceschi, G.; Provenzani, C. (2020). Benthic foraminifera as proxies of marine influence in the Orosei marine caves, Sardinia, Italy. <em>Aquatic Conservation: Marine and Freshwater Ecosystems.</em> 30: 701–716., available online at https://doi.org/10.1002/aqc.3288 [details]
basis of record
Gross, O. (2001). Foraminifera, <B><I>in</I></B>: Costello, M.J. <i>et al.</i> (Ed.) (2001). <i>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,</i> 50: pp. 60-75 (look up in IMIS) [details]
new combination reference
Parker, F. L. (1958). Eastern Mediterranean Foraminifera. <em>Reports of the Swedish Deep-Sea Expedition, Sediment Cores from the Mediterranean Sea and the Red Sea.</em> 8: 217-285.
page(s): p. 260, pl. 2, fig. 9 [details]
new combination reference
Balkwill, F. P.; Wright, J. (1885). Report on some Recent foraminifera found off the coast of Dublin and in the Irish Sea. <em>Transactions of the Royal Irish Academy.</em> 28: 317-368.
page(s): p. 335 [details] 
From editor or global species database