Serratia symbiotica

Serratia symbiotica is a species of bacteria that lives as a symbiont of aphids.^[1] In the aphid Cinara cedri, it coexists with Buchnera aphidicola, given the latter cannot produce tryptophan.^[2] It is also known to habitate in Aphis fabae.^[3] Together with other endosymbionts, it provides aphids protection against parasitoids.

Serratia symbiotica
Scientific classification
Domain:	Bacteria
Kingdom:	Pseudomonadati
Phylum:	Pseudomonadota
Class:	Gammaproteobacteria
Order:	Enterobacterales
Family:	Yersiniaceae
Genus:	Serratia
Species:	S. symbiotica
Binomial name
Serratia symbiotica Moran et al., 2005