The difference is in the ratio of the body to head and neck. The general shape of black rat is quite distinct from that of a TX form. You would have to agree that there is obviously enough of a difference to market them as such. That said, I admit the point may be somewhat moot depending on the local of the specimens used for the comparison. If you were pulling them out of adjacent counties in LA you might not see much of a difference.

I would not care to speculate on how this would manifest in an F1 cross because it was never my intent to take that on. I simply meant to say that if you want a lucy black rat you should look for characteristics that are manifest of that form. The same goes if you want a lucy TX rat.

The only issue here is that some want genetic purity, which I do not believe exists in this instance. People seem to forget the reproductive isolation is not a prerequisite for subspecific status and want something of captive animals that isn’t even true of wild populations. I can’t help that and they haven’t invented a pill for it yet.
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“Nothing is at last sacred but the integrity of your own mind.” Emmerson

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