Euyprmna scolopes harbors bacterial symbionts to utilize their light production. I investigated strain diversity in genes contributing to light production among coevolved symbionts isolated from an adult squid. After strains were isolated from the wild-caught squid, their genomes were sequenced. Using SnapGene, BLAST, NCBI, and Clustal Omega, I determined the extent of diversity in genes luxAB which encode for the heterodimer luciferse which is necessary for light production of the bacterial symbionts in the host.