[2][3] Tectiviruses have no head-tail structure, but are capable of producing tail-like tubes of ~ 60×10 nm upon adsorption or after chloroform treatment.

[4] The virions of Tectiviridae species are non-enveloped, icosahedral and display a pseudo T=25 symmetry.

Apical spikes extending about 20 nanometers (nm) protrude from the icosahedrons vertices.

[citation needed] The genome is a single molecule of linear double-stranded DNA of 15 kilobases in length, and has 30 open reading frames.

[2] Capsid proteins polymerize around a lipoprotein vesicle translocated in the cytoplasm by virion assembly factors.