What is "dyspanopeus"

Dyspanopeus is a genus of crabs in the family Xanthoidea, comprising two species:

• Dyspanopeus sayi ( Smith, 1869)
• Dyspanopeus texanus ( Stimpson, 1859)

Both species were formerly included in the genus Panopeus, but were separated off into a segregate genus in 1986, based on the form of their pleopods, which differ markedly from those in Panopeus and other genera.