The reason these spiders are called "dimorphic" is that the males can come in two different color styles. There is this black color scheme. Only the males look different with this spider - the females look exactly the same. This is fairly rare in the animal kingdom.
A tufted morph father will then have the mom create babies of both kinds. That is, the mom will have babies that look like him (black) and also have babies that look like the other kind of male (gray). However, when the babies are born, they'll all look gray, probably because it is a great camouflage color. It's only at the final molt that the tufted morph takes on its stunning black look.
Here's another one.
Here's a video of the black form of the dimorphic jumping spider, showing off its jumping powers.
Male Dimorphic Jumping Spider - Gray Morph
Female Dimorphic Jumping Spider
Dimorphic Jumping Spider Main Page
Jumping Spiders in Sutton Massachusetts
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Spiders in Sutton Massachusetts
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