T=pseudo3 icosahedral capsid is composed of 12 pentameric and 20 hexameric capsomeres for a total of 180 capsid proteins. These capsids are not T=3 symmetry as described by Caspar and Klug (PubMed) because the basic unit is composed of three different proteins. Since the three subunits are morphologically very similar, the structure is therefore a pseudo T=3.
Icosahedric triangulation number is calculated following Caspar and Klug system (1962 PubMed)
Comovirus, Fabavirus and Nepovirus share the same pseudo T=3 structure, eventhough subunits are not all processed.