The recurvature of the four teeth present in the fragments of Delorhynchus differs from that in the teeth of Colobomycter in which only the canine and precanine are recurved.
"Two New Pelycosaurs from the Lower Permian of Oklahoma"
Richard C. Fox
Observe the slender, stiff beak, terminating in two recurved points.
"Seed Dispersal"
William J. Beal
When ripe, the fruit is hard, carrying two stout beaks with recurved tips.
"Seed Dispersal"
William J. Beal