Amino acid sequence identity (AAI) distance matrix of the 10 distinct P. larvae phage large terminases (a) and corresponding phylogenetic tree (b). Large terminases are distributed into four phams, with each pham in the phylogenetic tree highlighted in a different color. LT pham 1 (Fern and Harrison clusters, Diane, Hayley, Vadim, Vegas) is highlighted in blue, LT pham 2 (Dragolir, LincolnB, Wanderer) in green, LT pham 3 (Halcyone cluster) in red, and LT pham 4 (Lily) in orange. Phages in LT pham 1 and LT pham 2 (blue and green, respectively) use the 3′ cohesive ends DNA packaging strategy, while phages in the LT pham 3 (red) use the direct terminal repeats strategy, and phage Lily (orange) uses the 5′ cohesive ends strategy.