Siphoviridae
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|(unranked)||dsDNA viruses
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λ-like viruses
T1-like viruses
T5-like viruses
c2-like viruses
L5-like viruses
ψM1-like viruses
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Siphoviridae is a family of double-stranded DNA viruses infecting only bacteria that are caracterized by a long non-contractile tail and an isometric capsid (morphotype B1) or a prolate capsid (morphotype B2).
The Siphoviridae viruses have a capsid with a diameter of about 55-60 nm and a long tail that can reach up to 570 nm. Their double-stranded DNA is linear. This family includes the phage λ, the phage χ and the phage φ80.