What specific color variation, noted in certain captive lines, introduces a blue or purplish tint to the *A. seemanni*?
Answer
The "Blue form"
While the classic presentation of the *Aphonopelma seemanni* features stark black and white striping, the species exhibits intraspecies diversity based on geographical origin or selective captive breeding. In certain populations or captive lines, observers have noted a deviation from the standard dark pigmentation, referred to as the "Blue form." In these specimens, the normally dark areas, which include the carapace or even parts of the legs, can take on a striking blue or purplish hue. This variation is sometimes especially noticeable when the tarantula is either very young or has recently undergone a molt, displaying heightened color saturation.
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