Phages come in different sizes and shapes...

It would be good to have an EM with more than one phage particle in field of view and some additional info. Who is the host of this one? Has it been sequenced already?

However, if we assume this to be a Siphoviridae phage:

Phicbkvirus and Corndogvirus genera representatives seem to have unusually long prolate heads and even longer tails of similar dimensions.

Have a look at:

Fig. 2 from Cresawn SG, Pope WH, Jacobs-Sera D, Bowman CA, Russell DA, et al. (2015) Comparative Genomics of Cluster O Mycobacteriophages. PLOS ONE 10(3): e0118725. https://doi.org/10.1371/journal.pone.0118725

And Fig. 1 from Gill, J.J., Berry, J.D., Russell, W.K. et al. The Caulobacter crescentus phage phiCbK: genomics of a canonical phage. BMC Genomics 13, 542 (2012). https://doi.org/10.1186/1471-2164-13-542

Hello, It is possible, did you get just one phage like that? It can happen that the head got damaged by any procedure you did, even from the TEM parameters you chose. Thus, the variables implied are too many to give an answer.

Nikita Zrelovs I appreciate for your attention. the host of this phage is Proteus mirabilis. as you said I did took several filed of view and saw three morphology with this type.

no it doesn't sequence yet.

thanks for your kindly response

Alberto Baldelli Hello

thanks for your attention. no I saw three of this morphology in different field of view also with myoviridae and siphoviridae and also Lipothrixviridae. I work on cocktail phage.

so you said that it maybe such as artifact in TEM?