 The tails are hollow with sixfold radial symmetry made of rings of six subunits with unknown orientation.Similar to cyanomyoviruses, they can be found in waste-stabilization ponds and have isometric capsids of similar size but shorter tails.Cyanostylovirus belong to the family "Siphoviridae", where the type species is Cyanophage S-1, which is known to infect "Synechococcus".