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
.