TABLE 1.

Taxonomic scheme incorporating reticulate groups

Virus	Possible taxonomy of virus
	Hierarchical portion			Reticulate portion (modi)a
	Domain	Division	Family
N15	dsDNA	Tailed bacteriophages	NAb	(a) λ-like head genes
				(b) Genes for λ-like flexible tail
				(c) Linear-episome-mediated temperate phage
λ	dsDNA	Tailed bacteriophages	NA	(a) λ-like head genes
				(b) Genes for λ-like flexible tail
				(d) Integrase-mediated temperate phage
HK97	dsDNA	Tailed bacteriophages	NA	(e) HK97-like head genes
				(b) Genes for λ-like flexible tail
				(d) Integrase-mediated temperate phage
SfV	dsDNA	Tailed bacteriophages	NA	(e) HK97-like head genes
				(f) Genes for Mu-like contractile tail
				(d) Integrase-mediated temperate phage
Mu	dsDNA	Tailed bacteriophages	NA	(g) Mu-like head genes
				(f) Genes for Mu-like contractile tail
				(h) Transposase-mediated temperate phage
Newcastle disease virus	ssRNA	Negative-sense genomic RNA	Paramyxoviruses	(i) Respirovirus-like RNA editing
				(j) Rubulavirus-like glycoproteins
				(k) Encodes P and V but not C proteins
Ebola virus	ssRNA	Negative-sense genomic RNA	Filoviruses	(l) Glycoproteins require transcriptional editing
				(m) Filamentous virions
M13	ssDNA	Filamentous phages	NA	(n) M13-like structural genes
				(o) M13-like replication genes
				(p) M13-like maturation genes
I2-2	ssDNA	Filamentous phages	NA	(n) M13-like structural genes
				(q) I2-2-like replication genes
				(p) M13-like maturation genes
φYP01	ssDNA	Filamentous phages	NA	(r) φYP01-like structural genes
				(q) I2-2-like replication genes
				(p) M13-like maturation genes
φX174	ssDNA	Icosahedral phages	NA	(s) External scaffolding protein
				(t) Lysis via inhibition of MraY protein

^aModi, designated here by lowercase letters in parentheses, are groups that may contain different subsets of bacteriophages (see the text).

^bNA, not applicable.