A phylogenetic tree shows the evolutionary relationships between selected groups of organisms. Blattabacterium Panesthia angustipennis spadica and Blattabacterium cuenoti BPAY are sister taxa and are closest to each other as they both have a common ancestor. We know that they have a common ancestor as these 2 groups are split from the same branch point. Meanwhile, Blaberus giganteus and Blattella germanica are classified as outgroups of Panesthia angustipennis spadica and cuenoti BPAY as they stems from a different direct ancestor, though they have the same ancestor 2 evolution up.
From the tree, we can tell that Megamonas hypermegale is classified under firmicutes phylum. In the firmicutes phylum, most bacteria are gram positive but M.hypermegale belongs to the Negativicutes class, which have a pseudo outer membrane, making them gram negative. Panesthia angustipennis spadica, Blaberus giganteus and Blattella germanica are classified under Cytophaga-Flavobacterium-Bacteroides (CFB) phylum, which are gram negatives and rod shaped. CFB group consist of 3 different genus combined together as a broad label due to the lack of knowledge of specific genus. Meanwhile, Blattabacterium cuenoti BPAY is classified under enterobacteria family, which are also gram negatives, rod shaped and are facultative anaerobes.