Evolution of the Secondary Symbiont “
Candidatus
Serratia symbiotica” in Aphid Species of the Subfamily Lachninae
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
.