Thank you Lucas Low Van Lun for your suggestion.
But i want one more confirmation, can we called them monophyletic (Aalba and Ao)??
I'm a bit suspicious to that tree, to me it looks odd to have A0 being separated from Aalba with such a relatively long branch and still not have Aalba monophyletic. What methods is the tree estimated with and is it correctly rooted? I would guess you may get a different result if you reestimated the phylogeny with a different method and if needed additional outgroups. But as already said Aalba is paraphyletic and A0 is monophyletic in your tree
Dear Ankush,
It would have been nice if you would have provided details such as type of data and the model used to derive of the tree. As can be seen, the branches are labelled with some numbers, I guess, the bootstrap values. Please clarify number of times data was simulated. In any case, refrain from interpretation of tree topologies especially when bootstrap support is low. PFA a book chapter on molecular phylogeny which we had written a few years ago. Hope this helps.
Dear Ankush,
As Svante Martinsson mentioned; you should re analyse your data with different method like Bayesian Inference. I would recommend to re look at your sequence alignment and delete any noisy flanks. WhaT I would like to say is to refine the alignment and carry on toward another analysis. In most cases the long branch results from bad alignment.
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