1948 , Joe Kendall Neel , A Limnological Investigation of the Psammon in Douglas Lake, This system of classification has merit, since it is desirable to be able to indicate variation in tolerance to conditions of the psammon; but, since Varga (1938) classed as psammoxenic certain species that were placed in the psammobiotic group by Wiszniewski, there appears to be some question of the validity of all three groups.
1990 , , Stygologia - Volumes 5-6 , It is remarkable that all testate amoebas belonging to the psammoxenic category are reported by Decloitre along the French coast of the department of Var.
1999 , Elizabeth Wurdak, ‎R. Wallace, ‎& Hendrik Segers , Rotifera VIII: A Comparative Approach , Probably the most common Dicranophorus. previous findings in limnosaprobic environments of fresh and brackish waters, but also recorded as psammoxenic species from the hygropsammon of lakes; cosmopolite
2007 , Victor Fet & ‎Alexi Popov , Biogeography and Ecology of Bulgaria , A total of 47 interstitial testate amoebas have been recorded in the Bulgarian Black Sea coast. Of these, 32 are psammobiotic, 11 are psammophilic, and 4 are psammoxenic.
