Numerous imprints of flaps and inner cores of diatoms and sponge spicules were found on the tests walls of the foraminifera Spiroplectammina, extracted from the deposits of the Maikop Series of the Lower and Upper Oligocene of the Southern Ukraine. The possibility of the new methods using for the study of siliceous microfossils by the example of diatoms and sponge spicules from the Oligocene deposits of the Northern Black Sea Region and the Crimea is considered. These methods are that the fossils taxonomic composition can be determined by their remnants in agglutinate of foraminifera using a scanning electron microscope, and analyzing of the direct and inverted images of objects. Representatives of at least 10 genera of Bacillariophyta, including Paralia, Radialiplicata, Pseudopodosira, Trochosira, Actinoptychus, Sceptroneis, Rhaphoneis and 20 morphotypes of sponge spicules are identified. Some speculations are done about the generic composition of the sponges of the Maikop basin of Southern Ukraine: at least 10 genera of sponges existed in the Early Oligocene (Geodia, Caminus, Pachymatisma, Erylus, Placospongia, Tethya, Lissodendoryx, Forcepia, Myxilla, Coelodischela), and of at least three genera - in the Late Oligocene (Caminus, Erylus, Placospongia).

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1. Bugrova E.M., Gladkova VI, Dmitrieva Т.V. et al., 2005. Practical guidance on microfauna, vol. 8. The Cenozoic Foraminifera. (Ed. B.S. Sokolov). St. Petersburg: VSEGEI, 324 p. (In Russian).
2. Hajdu Е., Lerner С., 2002. Family Guitarridae Dendy, 1924. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 651-655.
3. Hooper J. N.A., Soest R.W.M. van, 2002. Order Poecilosclerida Topsent, 1928. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 403-408.
4. Ivanik M.M., 2003. Paleogene Spongiofauna of the East- European Platform and adjacent regions. Кiev: Institute of geological sciences NAS of Ukraine, 202 p. (In Russian).
5. Ivanik M.M., Kraeva E.Ya., 1983. Foraminifera and spongiofauna of Paleogene deposits of the Black Sea coast of the Kerch Peninsula. In: Fossil fauna and flora of Ukraine, Кiev: Naukova dumka, pp. 65–70. (In Russian).
6. Ivanova T.A., 2003. To the stratigraphy of Maikopian sediments of the southern regions of the Plain Crimea by foraminifera. In: Modern problems of geological science, Кiev: Institute of geological sciences NAS of Ukraine, pp. 304-307. (In Russian).
7. Ivanova T.A., 2014. On sponge spicules from agglutinate of arenaceous foraminifera of the Lower Oligocene of Southern Ukraine. In: Paleostrat-2014., Ann. Meet. of the Sec. of Paleontol. of Moscow Society of Naturalists, Moscow: Paleontological Institute RAS, p. 35-36. (In Russian).
8. Łukowiak M., 2015. Late Eocene siliceous sponge fauna of southern Australia: reconstruction based on loose spicules record. Zootaxa, 65 p. http://dx.doi.org/10.11646/zootaxa.3917.1.1
9. Olshtynskaya A.P., 2007. Ecosystem Restructuring of Diatom Complexes at the Eocene and Oligocene Borders in Peritethys Basins. In: Paleontological research in Ukraine: History, current state and prospects, Collection of scientific works of the Institute of Geological Sciences of the National Academy of Sciences of Ukraine. Кiev: Institute of geological sciences NAS of Ukraine, pp. 248- 254. (In Russian).
10. Olshtynska O.P., 2013. Diatom and Silicoflagellata of the Lower Oligocene deposits of Peritethys. In: Stratigraphy of the sedimentary formations of the Upper Proterozoic and Phanerozoic, Materials of the International Scientific Conference (Kiev, 23–26 September, 2013), Кiev, p. 114. (In Ukrainian).
11. Olshtynskaya A.P., Stefanskaya T.A., 2016. The First Record of Bacillariophyta Imprintson Shells of Foraminifera Spiroplectammina Cushman (Lower Oligocene of Southern Ukraine). International Journal on Algae, vol. 18, no 3, pp. 287- 300.DOI: 10.1615/InterJAlgae.v18.i3.80
12. Rützler K. K., 2002. Family Placospongiidae Gray,1867. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 196-200.
13. Rützler K., Piantoni C., Soest R.W.M. van, Cristina Diaz M., 2014. Diversity of sponges (Porifera) from cryptic habitats on the Belize barrier reef near Carrie Bow Cay. Zootaxa, 129 p. http://dx.doi.org/10.11646/zootaxa.3805.1.1
14. Sarà М., 2002. Family Tethyidae Gray, 1848. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 245-265.
15. Sarà M., Bavestrello G., 1995. Tethya omanensis, a remarkable new species from an Oman cave (Porifera, Demospongiae). Bolletino di zoologia, 62:1, pp. 23-27. doi: 10.1080/11250009509356046
16. Sim-Smith C.J., Kelly M., 2015. The Marine Fauna of New Zealand: Sponges in the family Geodiidae (Demospongiae: Astrophorina). Wellington: NIWA (National Institute of Water and Atmospheric Research Ltd), 102 pp.
17. Soest R.W.M. van, 2002a. Family Coelosphaeridae Dendy, 1922. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 528-546.
18. Soest R.W.M. van, 2002b. Family Myxillidae Dendy, 1922. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 602-620.
19. Soest R.W.M. van, Beglinger E.J., Voogd N.J. de, 2013. Microcionid sponges from Northwest Africa and the Macaronesian Islands (Porifera, Demospongiae, Poecilosclerida). Zoologische Mededelingen, 87(4), pp. 275-404.
20. Soest R.W.M. van, Beglinger E.J., Voogd N.J. de, 2014. Mycale species (Porifera: Poecilosclerida) of North-West Africa and the Macaronesian Islands. Zoologische Mededelingen, 88 (4), pp. 59-109.
21. Systema Porifera: A Guide to the Classification of Sponges. 2002. Eds.: J.N.A. Hooper, R.W.M. van Soest, Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, 1708 pp.
22. Thesaurus of Sponge Morphology. 1997. Eds.: Boury- Esnault N., Rützler K., Smithsonian Contributions to Zoology, no 596, 55 p.
23. Uriz M.J., 2002. Family Geodiidae Gray, 1867. In: Hooper J.N.A., Soest R.W.M. van (eds.), Systema Porifera: A Guide to the Classification of Sponges. Kluwer Academic/ Plenum Publishers, New York, Boston, Dordrecht, London, Moscow, pp. 134-140.