ABSTRACT
The sequence of the genome of “
Candidatus
Tremblaya princeps” strain PCVAL, the primary endosymbiont of the citrus mealybug
Planococcus citri
, has been determined. “
Ca
. Tremblaya princeps” presents an unusual nested endosymbiosis and harbors a gammaproteobacterial symbiont within its cytoplasm in all analyzed mealybugs. The genome sequence reveals that “
Ca
. Tremblaya princeps” cannot be considered an independent organism but that the consortium with its gammaproteobacterial symbiotic associate represents a new composite living being.
ABSTRACT
Buchnera aphidicola
BCc, the primary endosymbiont of the aphid
Cinara cedri
(subfamily Lachninae), is losing its symbiotic capacity and might be replaced by the coresident “
Candidatus
Serratia symbiotica.” Phylogenetic and morphological analyses within the subfamily Lachninae indicate two different “
Ca
. Serratia symbiotica” lineages and support the longtime coevolution of both symbionts in
C. cedri
.