ch. 1. Proteobacteria as primary endosymbionts of arthropods / Abedalaziz Heddi and Roy Gross -- ch. 2. The Bacteroidetes Blattabacterium and Sulcia as primary endosymbionts of arthropods / Mateo Montagna. [et al.] -- ch. 3. Secondary symbionts of insects : acetic acid bacteria / Elena Crotti. [et al.] -- ch. 4. Facultative tenants from the Enterobacteriaceae within phloem-feeding insects / Tom L. Wilkinson -- ch. 5. Stammerula and other symbiotic bacteria within the fruit flies inhabiting Asteraceae flowerheads / Luca Mazzon. [et al.] -- ch. 6. Candidatus Midichloria mitochondrii : symbiont or parasite of tick mitochondria? / Dario Pistone. [et al.] -- ch. 7. Rickettsiella, intracellular pathogens of arthropods / Didier Bouchon, Richard Cordaux, and Pierre Greve -- ch. 8. Arthropods shopping for Wolbachia / Daniela Schneider, Wolfgang J. Miller, and Markus Riegler -- ch. 9. Host and symbiont adaptations provide tolerance to beneficial microbes : Sodalis and Wigglesworthia symbioses in tsetse flies / Brian L. Weiss. [et al.] -- ch. 10. Rickettsia get around / Yuval Gottlieb. [et al.] -- ch. 11. Cardinium : the next addition to the family of reproductive parasites / Hans Breeuwer, Vera I.D. Ros, and Tom V.M. Groot -- ch. 12. The genus Arsenophonus / Timothy E. Wilkes. [et al.].