1. Laboratory of Protistology and Biology Education; University of Macerata; P.le Bertelli 1 62100 Macerata Italy
2. Department of Physics; Bioorganic Chemistry Laboratory; University of Trento; 38123 Povo Trento Italy
3. School of Environmental Sciences; Section of Animal and Molecular Ecology; University of Camerino; Via Gentile III da Varano 62032 Camerino (MC) Italy
4. Ciliate Biology Laboratory; Sri Guru Tegh Bahadur Khalsa College; University of Delhi; Delhi 110007 India
5. Section of Physiology; School of Pharmacy; University of Camerino; Via Gentile III da Varano 62032 Camerino (MC) Italy