Children (8 direct children, 11 direct and indirect children):
Guyanancistrus niger
Pseudancistrus longispinis
Guyanancistrus brevispinis
(tree size 3)
Guyanancistrus tenuis
Guyanancistrus nassauensis
Guyanancistrus megastictus
Guyanancistrus brownsbergensis
Guyanancistrus teretirostris