Spiroloculina excavata d’Orbigny, 1846 –sensu John W. Murray, 2003. An illustrated guide to the benthic foraminifera of the Hebridean shelf, west of Scotland, with notes on their mode of life. Palaeontologia Electronica 5(1):31pp, (https://palaeo-electronica.org/2002_2/guide/4_13.htm), p.17 , fig. 4,13 -4,14.
Description: Test slightly ovate in outline, biconcave with acute periphery; all chambers are visible externally. Aperture a simple opening with a bifid tooth; apertural rim is slightly thickened and protruding. Proloculus is followed by a spiral tube of one or two whorls; arrangement of later chambers is planispiral, with two chambers in a whorl, which are successivelly more compressed (widht increases more than height), resulting in a biconcave test. Only four specimens were picked from 2 of the 1031 Bioice samples that were checked for forams.