lambdatorquevirus lambdatorquevirus lambdatorquevirus is a genus of viruses, in the family anelloviridae. sea lions serve as natural hosts. there are six species in this genus. lambdatorquevirus virus classification (unranked): virus realm: incertae sedis kingdom: incertae sedis phylum: incertae sedis class: incertae sedis order: incertae sedis family: anelloviridae genus: lambdatorquevirus taxonomy the genus contains the following species: torque teno pinniped virus 1 torque teno pinniped virus 2 torque teno pinniped virus 3 torque teno pinniped virus 5, previously named torque teno zalophus virus 1 torque teno pinniped virus 8 torque teno pinniped virus 9 structure viruses in lambdatorquevirus are non-enveloped, with icosahedral geometries, and t=1 symmetry. the diameter is around 19-27 nm. genomes are circular, around 2.1kb in length. the genome has 2 open reading frames. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation lambdatorquevirusicosahedralt=1non-envelopedcircularmonopartite life cycle viral replication is nuclear. entry into the host cell is achieved by penetration into the host cell. replication follows the ssdna rolling circle model. dna-templated transcription, with some alternative splicing mechanism is the method of transcription. the virus exits the host cell by nuclear pore export. sea lions serve as the natural host. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission lambdatorquevirussea lionsnonecell receptor endocytosisbuddingnucleusnucleusvertical; horizontal