Personal profile

My main interest is the investigation of mutualistic and parasitic protists from insects. Using light, transmission and scanning electron microscopy, I analyze the biodiversity, biology (e.g. life cycle stages) and structure of protists. In collaborative projects, molecular methods support the analysis of e.g. phylogeny and host specificity of the protists. One major field of interest are the symbiotic gut flagellates of lower termites (e.g., description and phylogeny of new flagellate species and genera, or of the associations of the flagellates and their bacterial symbionts). A second field of interest are spore-forming protists from cockroaches and beetles. Present work focuses on infections with the unicellular fungal taxon Nephridiophagales (phylogeny, impact on the host, life cycle details). Further investigated pathogen taxa are microsporidia and coccidia.

Current collaborations

Termite flagellates Prof. Dr. Andreas Brune, Max-Planck-Institute for Terrestrial Microbiology, Marburg. Insect pathogens Prof. Dr. Mustafa Yaman, Karadeniz Technical University of Trabzon, Turkey Prof. Dr. Andreas Linde, University of Applied Sciences Eberswalde, Germany Dr. Daniela Pilarska, Bulgarian Academy of Sciences,Sofia, Bulgaria PD Dr. Kerstin Voigt, Friedrich-Schiller-University of Jena, Germany Dr. Christian Wurzbacher, Universität Göteburg, Schweden

Third-party funds

DFG-Project „Die multiplen Symbiosen von Flagellaten und deren bakteriellen Endo- und Ektobionten in Trockenholztermiten: Eine Analyse von Ultrastruktur, Phylogenie und Kospeziation“ zusammen mit Prof. Dr. A. Brune, MPI Marburg (2007 – 2011).

Editorial board member

European Journal of Protistology: since 2005. Acta Protozoologica: since 2005. Journal of Eukaryotic Microbiology: since 2012.

Involvement in the organisation of meetings

IX International Congress of Protozoology, 1993 in Berlin 25. Scientific Meeting of the German Society for Protozoology, 2006 in Liebenwalde VI European Congress of Protistology, 2011 in Berlin as Secretary General

Member in learned societies

Berlin Microscopical Society, German Society for Protozoology, German Society for Parasitology, International Society of Protistology, Society for Invertebrate Pathology

Original Papers and Reviews

1. Bell, R., Scholtyseck, E., Elwasila, M. (1986): Blood parasites of the common African toad Bufo regularis in the Sudan. Sudan Journal of Science 2, 71-82.

2. Bell, R., Achenbach, F. (1987): Reactivation of cytoplasmic acto­myosin in Physarum plasmodia extracted with glycerol and dimethylsulfoxide. Journal of Cell Science 87, 231-239.

3. Bell, R., Scholtyseck, E. (1987): Developmental stages of Haemo­gregarina faiyumensis in the toad Bufo regularis in the Sudan. Archiv für Protisten­kunde 133, 277-283.

4. Bell, R. (1987): Untersuchungen zum Regulationsmechanismus der Kontraktion von cytoplasmatischem Aktomyosin in Zellmodellen von Physarum polycephalum. Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn, S. 1-225.

5. Bell, R. (1988): Reactivation of cell-free models of Physarum plasmodia after myosin reconstitution. European Journal of Cell Biology 47, 7-13.

6. Radek, R., Hausmann, K. (1991): Mikroorganismen in extremen Lebensräumen. Symbiontische Flagellaten in der Gärkammer von Termiten. Biologie in unserer Zeit 21, 160-162.

7. Radek, R., Hügelmeyer, P., Stockem, W. (1992): Studies on microplasmodia of Physarum polycephalum. VIII. Visualization of a membrane skeleton and characterization of membrane proteins. European Journal of Protistology 28, 305-315.

8. Radek, R., Hausmann, K., Breunig, A. (1992): Ectobiotic and endobiotic bacteria associated with the termite flagellate Joenia annectens. Acta Protozoologica 31, 93-107.

9. Radek, R. (1993): Methan-produzierende Einzeller in Müllkippen. Mikrokosmos 82, 207-208.

10. Radek, R., Hausmann, K. (1994): Placojoenia sinaica n. g. n. sp., a symbiotic flagellate from the termite Kalotermes sinaicus. European Journal of Protistology 30, 25-37.

11. Radek, R. (1994): Oxymonadida: Eine kleine Ordnung darmbewohnender Flagellaten. Mikrokosmos 83, 97-101.

12. Radek, R. (1994): Monocercomonoides termitis n. sp., an oxymonad from the lower termite Kalotermes sinaicus. Archiv für Protistenkunde 144, 373-382.

13. Radek, R., Hausmann, K. (1994): Endocytosis, digestion, and defecation in flagellates (review). Acta Protozoologica 33, 127-147.

14. Radek, R. (1994): Symbiontische Beziehungen zwischen Termiten und Flagellaten. Mitteilungen der Deutschen Gesellschaft für angewandte und allgemeine Entomologie 9, 369-377.

15. Hausmann, K., Radek, R., Gradias, M. (1995): Joenia paradoxa n. sp. (Heteroflagellata, nov. subphyl.), a protozoan metakaryote with extraordinary axonemal and kinetosomal features. Naturwissenschaften 82, 188-189.

16. Radek, R. (1996): Lectine. Ihre Bedeutung in Natur und Wissenschaft. Mikrokosmos 85, 93-99.

17. Rösel, J., Radek, R., Hausmann, K. (1996): Ultrastructure of the trichomonad flagellate Stephanonympha nelumbium. Eukaryotic Journal of Microbiology 43, 505-511.

18. Radek, R., Rösel, J., Hausmann, K. (1996): Light and electron microscopic study of the bacterial adhesion to termite flagellates applying lectin cytochemistry. Protoplasma 193, 105-122.

19. Radek, R. (1996/97): Monocercomonoides hausmanni nom. nov., a new species name for M. termitis Radek, 1994. Archiv für Protistenkunde 147, 411.

20. Radek, R. (1997): Spirotrichonympha minor n. sp., a new hypermastigote termite flagellate. European Journal of Protistology 33, 360-374.

21. Radek, R. (1998): Symbiosen von Tieren mit Mikroorganismen. I. Teil: Endocytosymbiosen. Mikrokosmos 87, 157-162.

22. Radek, R. (1998): Symbiosen von Tieren mit Mikroorganismen. II. Teil: Symbiosen in pflanzenfressenden Insekten und Wirbeltieren. Mikroskosmos 87, 205-210.

23. Rother, A., Radek, R., Hausmann, K. (1999): Characterization of surface structures covering termite flagellates of the family Oxymonadidae with special consideration of Microrhopalodina multinucleata and Oxymonas sp. European Journal of Protistology 35, 1-16.

24. Radek, R., Herth, W. (1999): Ultrastructural investigation of the spore-forming protist, Nephridiophaga blattellae, in the Malpighian tubules of the German cockroach, Blattella germanica. Parasitology Research 85, 216-231.

25. Radek, R., Tischendorf, G. (1999): Bacterial adhesion to termite flagellates: Characterization of the attachment sites by treatment with chemicals and by freeze-etching. Protoplasma 207, 43-53.

26. Radek, R. (1999): Wirtstier-spezifische Artengemeinschaften von symbiontischen Flagellaten in Niederen Termiten. Courier Forschungsinstitut Senckenberg 215, 157-161.

27. Radek, R. (1999): Flagellates, bacteria, and fungi associated with termites: Diversity and function in nutrition - a review. Ecotropica 5, 183-196.

28. Radek, R., Fabel, P. (2000): A new entomopoxvirus from a cockroach: Light and electron microscopy. Journal of Invertebrate Pathology 75, 19-27.

29. Radek, R. (2000): Light and electron microscopic study of a Rickettsiella species from the cockroach Blatta orientalis. Journal of Invertebrate Pathology 76, 249-256.

30. Fabel, P., Radek, R., Storch, V. (2000): A new spore-forming protist, Nephridiophaga blaberi sp. nov., in the death´s head cockroach Blaberus craniifer. European Journal of Protistology 36, 387-395.

31. Radek, R., Hausmann, K. (2001): Lorenz Oken: Naturwissenschaftler und Naturphilosoph. Mikrokosmos 90, 257-260.

32. Simpson, A. G. B., Radek, R., Dacks, J. B., O´Kelly, C. J. (2002): How oxymonads lost their groove: An ultrastructural comparison of Monocercomonoides and excavate taxa. Journal of Eukaryotic Microbiology 49, 239-248.

33. Radek, R., Klein, G., Storch, V. (2002): The spore of the unicellular organism Nephridiophaga blattellae: Ultrastructure and substances of the spore wall. Acta Protozoologica 41, 169-181.

34. Wenzel, M., Radek, R., Brugerolle, G., König, H. (2003): Identification of the ectosymbiotic bacteria of Mixotricha paradoxa involved in movement symbiosis. European Journal of Protistology 39, 11-23.

35. Yaman, M., Radek, R. (2003): Nosema chaetocnemae sp. n. (Microspora: Nosematidae), a microsporidian parasite of Chaetocnema tibialis (Coleoptera: Chrysomelidae). Acta Protozoologica 42, 231-237.

36. Hausmann, K., Radek, R. (2003): Die sonderbaren Extrusomen der Microthoraciden (Ciliaten). Mikrokosmos 92, 211-217.

37. Stingl, U., Maass, A., Radek, R., Brune, A. (2004): Symbionts of the
    gut flagellate Staurojoenina sp. from Neotermes cubanus represent a novel, termite-associated lineage of Bacteroidales: Description of 'Candidatus Vestibaculum illigatum. Microbiology 150, 2229-2235.

38. Wylezich, C., Radek, R., Schlegel, M. (2004): Phylogenetische Analyse der 18S rRNA identifiziert den parasitischen Protisten Nephridiophaga blattellae (Nephridiophagidae) als Vertreter der Zygomycota (Fungi). Denisia 13, 435-442.

39. Yaman, M., Radek, R. (2005): A new microsporidian parasite record of Phyllotreta undulata (Chrysomelidae, Coleoptera). Turkish Journal of Zoology 29, 67-69.

40. Stingl, U., Radek, R., Yang, H., Brune, A. (2005): “Endomicrobia”: Cytoplasmic symbionts of termite gut protozoa form a separate phylum of prokaryotes. Applied and Environmental Microbiology 71, 1473-1479.

41. Yaman, M., Radek, R., Aslan, İ., Ertürk, Ö. (2005): Characteristic features of Nosema phyllotretae Weiser 1961, a microsporidian parasite of Phyllotreta atra (Coleoptera: Chrysomelidae) in Turkey. Zoological Studies 44, 368-372.

42. Yaman, M., Radek, R. (2005): Helicosporidium infection of the great spruce bark beetle, Dendroctonus micans (Coleoptera: Scolytidae). European Journal of Protistology 41, 203-207.

43. Yaman, M., Aslan, İ., Radek, R. (2005): Phyllotreta nigripens (Coleoptera: Chrysomelidae), a new host of Nosema phyllotretae Weiser 1961 in Turkey. Journal of Pest Science 78, 239-242.

44. Dröge, S., Fröhlich, J., Radek, R., König, H. (2006): Spirochaeta coccoides, a novel coccoid spirochete from the hindgut of the termite Neotermes castaneus. Applied and Environmental Microbiology 72, 392-397.

45. Maaß, A., Radek, R. (2006): The gut flagellate community of the termite Neotermes cubanus with special reference to Staurojoenina and Trichocovina hrdyi nov. gen. nov. spec. European Journal of Protistology 42, 125–141.

46. Corsaro, D., Thomas, V., Goy, G., Venditti, D., Radek, R., Greub, G. (2007): ‘Candidatus Rhabdochlamydia crassificans’, an intracellular bacterial pathogen of the cockroach Blatta orientalis (Insecta: Blattodea). Systematic and Applied Microbiology 30, 221–228.

47. König, H., Fröhlich, J., Li, L., Wenzel, M., Dröge, S., Breunig, A., Pfeiffer, P., Radek, R., Brugerolle, G. (2007): The flagellates of the Australian termite Mastotermes darwiniensis: Identifi­cation of their symbiotic bacteria and cellulases. Symbiosis 44, 51–65.

48. Radek, R., Nitsch, G. (2007): Ectobiotic spirochetes of flagellates from the termite Mastotermes darwiniensis: Attachment and cyst-formation. European Journal of Protistology 43, 281-294.

49. Yaman, M., Radek, R. (2007): Infection of the predator beetle Rhizophagus grandis Gyll. (Coleoptera, Rhizophagidae) with the insect pathogenic alga Helicosporidium sp. (Chlorophyta: Trebouxiophyceae). Biological Control 41, 384-388.

50. Radek, R. (2008): Mikroskosmos: Leser, Autoren und Themenbereiche. Mikrokosmos 97, Sonderheft, 11-13.

51. Yaman, M., Radek, R. (2008): Pathogens and parasites of the great European spruce bark beetle, Dendroctonus micans (Kugelann) (Coleoptera: Scolytidae). Journal of Pest Science 81, 91-97.

52. Dröge, S., Rachel, R., Radek, R., König, H. (2008): Treponema isoptericolens sp. nov., a novel spirochete from the hindgut of the termite Incisitermes tabogae. International Journal of Systematic and Evolutionary Microbiology 58, 1079-1083.

53. König, H., Fröhlich, J., Li, L., Wenzel, M., Dröge, S., Breunig, A., Pfeiffer, P., Radek, R., Brugerolle, G. (2008): Identification of the endo- and ectosymbiotic bacteria and cellulolytic activities of the symbiotic flagellates of the Australian termite Mastotermes darwiniensis. Mitteilungen der Deutschen Gesellschaft für Allgemeine und Angewandte Entomologie 16, 211-218.

54. Yaman, M., Radek, R. (2008): Identification, distribution and occurrence of the ascomycete Metschnikowia typographi from the great spruce bark beetle, Dendroctonus micans. Folia Microbiologica 53, 427-432.

55. Yaman, M., Radek, R., Toguebaye, B. S. (2008): A new microsporidian of the genus Nosema, parasite of Chaetocnema tibialis (Coleoptera: Chrysomelidae) from Turkey. Acta Protozoologica 47, 279-285.

56. Hausmann, K., Radek, R. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil1: Symphorismus, Kommensalismus und Parasitismus. Mikrokosmos 98, 176-180.

57. Radek, R., Hausmann, K. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil 2: Symbiontische Termitenflagellaten. Mikrokosmos 98, 213-220.

58. Hausmann, K., Radek, R. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil 3: Pansenciliaten. Mikrokosmos 98, 273-280.

59. Radek, R. (2009): Acidocalcisomen, Mitosomen und Apicoplasten als neue Zellorganellen. Biologie in unserer Zeit 4/2009 (39), 242-248.

60. Radek, R. (2009): Neue Zellorganellen: Acidocalcisomen, Mitosomen, Apicoplasten. Mikrokosmos 98, 342-346.

61. Mater, A., Radek, R. (2009): Diversität von Pansenciliaten aus einem Rind. Mikrokosmos 98, 369-376.

62. Yaman, M., Radek, R., Aydın, Ç., Tosun, O., Ertürk, Ö. (2009): First record of the insect pathogenic alga Helicosporidium sp. (Chlorophyta: Trebouxiophyceae) infection in larvae and pupae of Rhizophagus grandis Gyll. (Coleoptera, Rhizophaginae) from Turkey. Journal of Invertebrate Pathology 102, 182-184.

63. Strassert, J.F.H., Desai, M.S., Brune, A., Radek, R. (2009): The true diversity of devescovinid flagellates in the termite Incisitermes marginipennis. Protist 160, 522-535.

64. Yaman, M., Radek, R., Tosun, O., Ünal, S. (2009): Nosema raphidiae sp.n. (Microsporida, Nosematidae), a microsporidian pathogen of the predatory snake-fly Raphidia ophiopsis (Raphidioptera:Raphidiidae). Acta Protozoologica 48, 353-358.

65. Yaman, M., Radek, R., Weiser, J. (2010): Unikaryon phyllotretae sp. n. (Protista, Microspora), a new microsporidian pathogen of Phyllotreta undulata (Coleoptera; Chrysomelidae). European Journal of Protistology 46, 10-16.

66. Radek, R., Aydin, Ç, Tosun, O., Ertürk, Ö., Linde, A., Yaman, M. (2010) Pathogens of the bark beetle Dendroctonus micans and its predator Rhizophagus grandis from Turkey. Proceedings of the 43 Annual Meeting of the Society for Invertebrate Pathology, 11.-15.7.2010, Trabzon, Turkey, S. 22-31 in Symposium “Microsporidia and other pathogens in arthropods from the Eastern Mediterranean Region”.

67. Linde, A., Radek, R., Yaman, M. (2010): An overview on entomopathogenic protists from Turkey. Proceedings of the 43 Annual Meeting of the Society for Invertebrate Pathology, 11.-15.7.2010, Trabzon, Turkey, S. 14-21 in Symposium “Microsporidia and other pathogens in arthropods from the Eastern Mediterranean Region”.

68. Strassert, J. F. H., Desai, M. S., Radek, R., Brune, A. (2010): Identification and localization of the multiple bacterial symbionts of the termite gut flagellate Joenia annectens. Microbiology 156, 2068-2079.

69. Desai, M. S., Strassert, J. F. H., Meuser, K., Hertel, H., Ikeda-Ohtsubo, W., Radek, R., Brune, A. (2010): Strict cospeciation of devescovinid flagellates and Bacteroidales ectosymbionts in the gut of dry-wood termites (Kalotermitidae). Environ. Microbiol. 12, 2120-2132.

70. Yaman, M., Radek, R., Weiser, J., Aydin, Ç. (2010): A microsporidian pathogen of the predatory beetle Rhizophagus grandis (Coleoptera: Rhizophagidae). Folia Parasitologica 57, 233-236.

71. Könecke, M., Radek, R. (2011): Gregarinen in Schaben. Mikrokosmos 100, 105-111.

72. Yaman, M. Radek, R., Özcan, N., Linde, A., Lipa, J. J. (2011): Ultrastructure, characteristic features and occurrence of Nosema leptinotarsae Lipa 1968, a microsporidian pathogen of Leptinotarsa decemlineata (Coleoptera: Chrysomelidae). Acta Parasitologica 56, 1-7.

73. Radek, R., Krüger, J., Yaman, M. (2011): Virenbefall von Kleidermottenlarven. Mikrokosmos 100, 311-317.

74. Radek, R., Wellmanns, D., Wolf, A. (2011): Two new species of Nephridiophaga (Zygomycota) in the Malpighian tubules of cockroaches. Parasitol. Res. 109, 473-482.

75. Yaman, M., Bekircan, Ç., Radek, R., Linde, A. (2012): The first record of nucleopolyhedrovirus isolated from the gypsy moth, Lymantria dispar (Lepidoptera, Lymantriidae) in Turkey. Turkiye Parazitol. Derg. 36, 92-95. DOI: 10.5152/tpd.2012.22

76. Yaman, M., Radek, R. (2012): Menzbieria chalcographi, a new pathogen of the great spruce bark beetle, Dendroctonus micans (Kugelann) (Curculionidae, Scolytinae). Acta Parasitologica 57, 216-220. DOI: 10.2478/s11686-012-0033-6.

77. Yaman, M., Radek, R., Linde, A. (2012): A new neogregarine pathogen of Rhizophagus grandis (Coleoptera: Monotomidae). North-Western Journal of Zoology 8, 353-357.

78. Strassert, J.F.H., Köhler, T., Wienemann, T.H.G., Meuser, K., Ikeda-Ohtsubo, W., Faivre, N., Franckenberg, S., Radek, R., Brune, A. (2013): Diversity and localization of bacterial symbionts associated with Trichonympha flagellates in lower termites. Environ. Microbiol.14, 3259–3270 (2013). doi:10.1111/1462-2920.12012 (2012).

79. Tamschick, S., Radek, R. (2013): Colonization of termite hindgut walls by oxymonad flagellates and prokaryotes in Incisitermes tabogae, I. marginipennis and Reticulitermes flavipes. Europ. J. Protistol. 49, 1-14.

80. Pilarska, D., Radek, R., Huang, W.-F., Takov, D., Linde, A., Solter, L.F. (2014): Review of the genus Endoreticulatus (Microsporidia, Encephalitozoonidae) with description of a new species isolated from the grasshopper Poecilimon thoracicus (Orthoptera: Tettigoniidae) and transfer of Microsporidium itiiti Malone to the genus. J. Invertebr. Pathol. 124, 23-30.

81. Krämer, J., Radek, R. (2014): Pansenciliaten aus Schafen – Eine qualitative und quantitative Analyse. Mikrokosmos 103, 65-73

82. Radek, R., Strassert, J.F.H., Krüger J., Meuser, K., Scheffrahn, R.H., Brune A. (2014): Phylogeny and ultrastructure of Oxymonas jouteli, a rostellum-free species, and Opisthomitus longiflagellatus sp. nov., oxymonadid flagellates from the gut of Neotermes jouteli. Protist 165, 384-399.

83. Yaman, M., Radek, R. (2015): Mattesia weiseri sp. nov., a new neogregarine pathogen of the great spruce bark beetle, Dendroctonus micans (Coleoptera: Curculionidae, Scolytinae). Parasitology Research 114, 2951–2958. doi: 10.1007/s00436-015-4497-9

84. Ndomo-Moualeu, A. F., Ulrichs, C., Radek, R., Adler, C. (2014): Structure and distribution of antennal sensilla in the Indianmeal moth, Plodia interpunctella (Hübner, 1813) (Lepidoptera: Pyralidae). J. Stored Prod. Res. 59, 66-75.

85. Yaman, M., Becirkan, Ç., Radek, R. Linde, A. (2014): Nosema pieriae sp. n. (Microsporida, Nosematidae): A new microsporidian pathogen of the cabbage butterfly Pieris brassicae L. (Lepidoptera: Pieridae). Acta Protozoologica 53, 223-232.

86. Pilarska, D., Radek, R., Huang, W.-F., Takov, D., Linde, A., Solter, L.F. (2014): Review of the genus Endoreticulatus (Microsporidia, Encephalitozoonidae) with description of a new species isolated from the grasshopper Poecilimon thoracicus (Orthoptera: Tettigoniidae) and transfer of Microsporidium itiiti Malone to the genus. J. Invertebr. Pathol. 124, 23-30.

87. Radek, R., Kariton, M., Dabert, J., Alberti, G. (2015): Ultrastructural characterization of Acarispora falculifera n. gen., n. sp., a new microsporidium (Opisthokonta: Chytridiopsida) from the feather mite Falculifer rostratus (Astigmata: Pterolichoidea). Acta Parasitologica 60, 200-210.

88. Yaman, M., Radek, R. (2015): Mattesia weiseri sp. nov., a new neogregarine pathogen of the great spruce bark beetle, Dendroctonus micans (Coleoptera: Curculionidae, Scolytinae). Parasitology Research 114, 2951–2958. doi: 10.1007/s00436-015-4497-9

89. Yaman, M., Acar, K.F., Radek, R. (2015): A nucleopolyhedrovirus from the Mediterranean flour moth, Ephestia kuehniella (Lepidoptera: Pyralidae). Applied Entomology and Zoology 50, 355-359. doi: 10.1007/s13355-015-0342-y.

90. Hausmann, K., Günther, G., Lehmann, D., Radek, R. (2016): On the enigmatic hook of the metaradiophryids (Alveolata, Ciliophora). Acta Protozoologica 55, 1-5. doi: 10.4467/16890027AP.16.001.4042.

91. Zheng, H., Dietrich, C., Radek, R., Brune, A. (2016): Endomicrobium proavitum, the first isolate of Endomicrobia class. nov. (phylum Elusimicrobia) – an ultramicrobacterium with an unusual cell cycle that fixes nitrogen with a Group IV nitrogenase. Environmental Microbiology 18, 191-204. doi/10.1111/1462-2920.12960/pdf

92. Yaman, M., Güngör, F. P., Güner, B. G., Radek, R., Linde, A (2016): First report and spore ultrastructure of Vairiomorpha plodiae (Opisthokonta: Microspora), from Plodia interpunctella

93. Ikeda-Ohtsubo, W., Strassert, J.F.H., Köhler, T., Mikaelyan, A., Gregor, I., McHardy, A., Green Tringe, S., Hugenholtz, P., Radek, R., Brune, A. (2016): ‘Candidatus Adiutrix intracellularis’, a homoacetogenic deltaproteobacterium colonizing the cytoplasm of termite gut flagellates (Trichonympha collaris). Environmental Microbiology 18, 2548-2564. doi:10.1111/1462-2920.13234.

94. Tegtmeier, D., Riese, C., Geissinger, O., Radek, R., Brune, A. (2016): Breznakia blatticola gen. nov. sp. nov. and Breznakia pachnodae sp. nov., two fermenting bacteria isolated from insect guts, and emended description of Erysipelotrichaceae. Systematic and Applied Microbiology 39, 319-329. http://dx.doi.org/10.1016/j.syapm.2016.05.003

95. Yaman, M., Eroğlu, M., Radek, R. (2016): Occurrence of a microsporidian infection in the predatory beetle Calosoma sycophanta L. (Coleoptera: Carabidae). Turkish Journal of Agriculture and Forestry 40, 420-424. doi:10.3906/tar-1507-42.

96. Melina, S., Martono, E., Trisyono, Y., Moechtar, S., Radek, R. (2016): Morphology of adult Helopeltis bradyi (Heteroptera: Miridae) of Java, resolving a longstanding species uncertainty. North Western Journal of Zoology 12, 110-121.

97. Radek, R., Wurzbacher, Ch., Gisder, S., Nilsson, H.R., Owerfeldt, A., Genersch, E., Voigt, K. (in preparation): The fungal kingdom adopts the insect-pathogenic nephridiophagids (Nephridiophagidae) within the chytrids. Mycokeys

98. Radek, R., Meuser, K., Strassert, J.F.H., Arslan, O., Teßmer, A., Šobotník, J., Sillam-Dussès, D., Nink, R.A., Brune, A. (2018): Exclusive gut flagellates of Serritermitidae suggest a major transfaunation event in lower termites: Description of Heliconympha glossotermitis gen. nov. spec. nov. Journal of Eukaryotic Microbiology 65, 77-92. doi:10.1111/jeu.12441

99. Tegtmeier, D., Belitz, A., Radek, R., Heimerl, T., Brune, A. (2018): Ereboglobus luteus gen. nov. sp. nov. from cockroach guts, and new insights into the oxygen relationships of the genera Opitutus and Didymococccus (Verrucomicrobia: Opitutaceae). Systematic and Applied Microbiology 41, 101-112. https://doi.org/10.1016/j.syapm.2017.10.005

100. Kobel-Höller, K., Gley, K., Jochinke, J., Heider, K., Fritsch, V.N., Nguyen, H.V.D., Lischke, T., Radek, R., Baumgrass, R., Mutzel, R., Thewes, S. (2018): Calcineurin silencing in Dictyostelium discoideum leads to cellular alterations affecting mitochondria, gene expression, and oxidative stress response. Protist 169, 584-602. https://doi.org/10.1016/j.protis.2018.04.004

101. González-Tortuero,E.,Rodríguez-Beltran, J., Radek, R., Blázquez J., Rodríguez-Rojas, A. (2018): Clay-induced DNA breaks as a path for genetic diversity, antibiotic resistance, and asbestos carcinogenesis. Scientific Reports 8, 1-10. DOI 10.1038/s41598-018-26958-5

102. Davis,H. E., Meconcelli, S., Radek, R, McMahon, D.P. (2018): Termites shape their collective behavioural response based on stage of infection. Scientific Reports 8, 14433. DOI:10.1038/s41598-018-32721-7

103. Wijayawardene, N.N., Pawlowska, J., Letcher, P.M., Kirk, P.M., Humber, R.A., Schüßler, A., Wrzosek, M., Muszewska, A., Okrasińska, A., Istel, Ł., Geşiorska, A., Mungai, P., Lateef, A.A., Rajeshkumar, K.C:, Singh, R.V., Radek, R., Walther, G., Wagner, L., Walker, C., Wijesundara, D.S.A., Papizadeh, M., Dolatabadi, S., Shenoy, B.D., Tokarev, Y.S., Lumyong, S., Hyde, K.D. (2018): Notes for genera: basal clades of Fungi (including Aphelidiomycota, Basidiobolomycota, Blastocladiomycota, Calcarisporiellomycota, Caulochytriomycota, Chytridiomycota, Entomophthoromycota, Glomeromycota, Kickxellomycota, Monoblepharomycota, Mortierellomycota, Mucoromycota, Neocallimastigomycota, Olpidiomycota, Rozellomycota and Zoopagomycota). Fungal Diversity 92, 43-129, https://doi.org/10.1007/s13225-018-0409-5

104. Yaman, M., Algi, G., Radek, R. (2019): Morphological, ultrastructural, and molecular identification of a new microsporidian pathogen isolated from Crepidodera aurata (Coleoptera, Chrysomelidae). Turkish Journal of Zoology 43, 407-415, doi:10.3906/zoo-1902-4

105. Radek, R., Meuser,K., Altinay,S., Lo,N., Brune, A. (2019): Novel lineages of oxymonad flagellates from the termite Porotermes adamsoni (Stolotermitidae): the new genera Oxynympha and Termitimonas. Protist 170, 125683, https://doi.org/10.1016/j.protis.2019.125683

106. Wijayawardene, N.N., Hyde, K.D., Al-Ani, L.K.T., Tedersoo, L., Haelewaters, D.,. Rajeshkumar, K.C., Zhao, R.-L., Aptroot, A., Leontyev, D.V., Saxena, R.K., Tokarev, Y.S., Dai, D.-Q., Letcher, P.M., Stephenson, S.L., Ertz, D., Lumbsch, H.T., Kukwa, M., Issi, I.V., Madrid, H., Phillips, A.J.L., Selbmann, L., Pfliegler, W.P., Horváth, E., Bensch, K., Kirk, P., Kolaříková, Z., Raja, H.A., Radek, R., et al. (2020): Outline of Fungi and fungi-like taxa. Mycosphere 11(1), 1060–1456, ISSN 2077 7019, doi 10.5943/mycosphere/11/1/8

107. Strassert, J.F.H., Wurzbacher, C., Hervé, V., Antany, T., Brune, A., Radek, R. (2021): Long rDNA amplicon sequencing of insect‑infecting nephridiophagids reveals their affiliation to the Chytridiomycota and a potential to switch between hosts. Sci. Rep. 11, 396. https://doi.org/10.1038/s41598-020-79842-6, https://rdcu.be/cdnrg (open access)

108. Radek, R. (2021): Obituary. In memoriam: Norbert Hülsmann (1945–2020). European Journal of Protistology 79, 125764. https://doi.org/10.1016/j.ejop.2020.125764

109. Song, Y., Hervé, V., Radek, R., Pfeiffer, F., Zheng, H., Brune, A. (accepted May 2021): Termite gut treponemes evolved from ancestral non-acetogenic spirochetes in cockroaches: description of Breznakiella homolactica gen. nov. sp. nov. (fam. ‘Termitinemataceae’). Environmental Microbiology. https://doi.org/10.1111/1462-2920.15600 (open access)

110. Yaman, M., Radek, R. (accepted 2021):Characteristic light and electron microscopic features of Adelina melolonthae, a coccidian pathogen of the European cockchafer, Melolontha melolontha ( Coleoptera: Scarabaeidae). Acta Parasitologica

111. Voigt, K., James, T.Y., Kirk, P.M., Santiago, A.L.C.M. de A., Waldman, B., Griffith, G.W., Fu, M., Radek, R., Strassert, J.F.H., Wurzbacher, C., Jerônimo, G.H., Simmons, D.R., Seto, K., Gentekaki, E., Hurdeal, V.G., Hyde, K.D., Nguyen, T.T.T., Lee, H.B. (submitted 2021): Early-brancing fungi: Taxonomy, species concept, ecology, distribution, anthropogenic impact, and novel phylogenetic proposals. Fungal Diversity (review in Special Issue).

Book chapters

1. Hausmann, K., Radek, R. (1993): A comparative survey on phagosome formation in protozoa. In: Membrane Traffic in Protozoa (H. Plattner, ed.), pp. 259-282, JAI Press Inc., Greenwich, Conneticut, USA.

2. Radek, R., Hausmann, K. (1994): Symbiontische Flagellaten im Termitendarm. In: Extremophile. Mikroorganismen in ausgefallenen Lebensräumen (K. Hausmann und B.P. Kremer, Hrsg.), pp. 325-339. VCH Verlagsgesellschaft, Weinheim.

3. Radek, R., Hausmann, K. (1995): Symbiontische Flagellaten im Darm von niederen Termiten. In: Biologie der Protozoen. Ein Praktikum zur Vielfalt der Formen und Lebensräume der Einzeller (R. Röttger, Hrsg.), pp. 74-79. Gustav Fischer Verlag, Stuttgart.

4. Radek, R., Hausmann, K. (1996): Chapter 6: Phagotrophy. In: Ciliates: Cells as organisms (K. Hausmann, P. Bradbury, eds.), pp. 197-219. Gustav Fischer Verlag, Stuttgart.

5. Brugerolle, G. Radek, R. (2006): Symbiotic protozoa of termites (chapter 13). In: Intestinal microorganisms of termites and other invertebrates (Series: Soil Biology) (H. König, A.Varma, eds.), pp. 243-269.Springer Verlag, Berlin.

6. Hausmann, K., Hülsmann, N., Radek, R. (2006): „Einzellige Eukaryota“, Einzeller. In: Westheide, W. und Rieger, R. (Hrsg.) Spezielle Zoologie, Teil 1: Einzeller und Wirbellose Tiere, S. 2–65, Elsevier, München.

7. Radek, R., Hausmann, K. (2009): Symbiotic flagellates in the gut of lower termites. In: Röttger, R., Foissner, W. (eds.) Courses in Protozoology, pp. 72-79, Shaker Verlag, Aachen.

8. Radek, R., Hausmann, K., Stockem, W. (2009): Amoeba proteus. In: Röttger, R., Foissner, W. (eds.) Courses in Protozoology, pp. 92-96, Shaker Verlag, Aachen.

9. Radek, R. (2010): Adhesion of bacteria to protists. In: König, H., Claus, H., Varma, A. (eds.) Prokaryotic cell wall compounds – Structure and biochemistry, pp. 429-456, Springer-Verlag, Berlin, Heidelberg

10. Radek, R., Hausmann, K. (2013): „Einzellige Eukaryota“, Einzeller. In: Westheide, W. und Rieger, R. (Hrsg.) Spezielle Zoologie, Teil 1: Einzeller und Wirbellose Tiere, S. 2–58, Elsevier, München.

11. Hausmann, R., Radek, R. (2014): Cilia and flagella – ciliates and flagellates. In: Hausmann, K., Radek, R. (Hrsg.) (2014): Cilia and flagella – ciliates and flagellates. Ultrastructure and cell biology, function and systematics, symbiosis and biodiversity. Pp. 3-19. Schweizerbart Science Publishers, Stuttgart.

12. Radek, R., Strassert, J.F.H., Brune, A. (2014): Symbionts of symbionts: Termite flagellates and their bacterial associations. In: Hausmann, K., Radek, R. (Hrsg.) (2014): Cilia and flagella – ciliates and flagellates. Ultrastructure and cell biology, function and systematics, symbiosis and biodiversity. Pp. 239-251. Schweizerbart Science Publishers, Stuttgart.

Books and special edition of journals

1. Hausmann, K., Hülsmann, N., Radek, R. (2003): Protistology. E. Schweitzerbart’sche Verlagsbuchhandlung, Stuttgart, S. 1–379. Chinesische Auflage 2007, Russische Auflage 2010, Koreanische Auflage 2011

2. Hausmann, K., Radek, R. (2006): Festschrift – 25 Jahre Deutsche Gesellschaft für Protozoologie. E. Schweitzerbart’sche Verlagsbuchhandlung, Stuttgart, S. 1–277.

3. Hausmann, K., Radek, R. (Hrsg.) (2008): 100 Jahre Mikrokosmos. Mikrokosmos 97, Sonderheft, Elsevier, S. 1-64.

4. Hausmann, K., Radek, R. (ed.) (2014): Cilia and Flagella – Ciliates and Flagellates. Ultrastructure and cell biology, function and systematics, symbiosis and biodiversity. Schweizerbart Science Publishers, Stuttgart.

Film with accompanying publication

1. Radek, R., Hausmann, K., Haarhaus, D. (1994): Symbiontische Flagellaten in Termiten. Publikation für den Wissenschaftlichen Film Biologie 21, 153-171. Film C 1790 (1992) in Zusammenarbeit mit dem Institut für den Wissenschaftlichen Film, Göttingen.