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. Agglutinated foraminifera are marine protists that show apparently complexbehaviour in constructing their shells, involving selecting suitablesedimentary grains from their environment, manipulating them in threedimensions, and cementing them precisely into position. Here we illustrate astriking and previously undescribed example of complex organisation infragments of a tube-like foraminifer (questionably assigned toRhabdammina) from 1466 m water depth on the northwest Australianmargin. The tube is constructed from well-cemented siliciclastic grains whichform a matrix into which hundreds of planktonic foraminifer shells areregularly spaced in apparently helical bands. These shells are of a singlespecies, Turborotalita clarkei, which has been selected to theexclusion of all other bioclasts. The majority of shells are set horizontallyin the matrix with the umbilical side upward. This mode of construction, asis the case with other agglutinated tests, seems torequire either an extraordinarilyselective trial-and-error process at the site of cementation or an activesensory and decision-making system within the cell.

A deep-sea agglutinated foraminifer tube constructed with planktonic foraminifer shells of a single species