Foraminiferan tests can range from simple to very complex linear arrangements. From left to right there is the tubular Bathysiphon rufescens 1, lanceolate Bolivina punctatostriata 1, Siphogenerina pacifica and striatula (right two) 2, and finally the arborescent Dendronina aborescens1.
1. (Lipps, J.H. Fossil Prokaryotes and Protists)
2.(Loebelich, A.R. and Tappan, H. Foraminifera of the Sahul Shelf and Timor Sea)