- 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.
- Calyx 5- parted; corolla of 5 spreading, recurved lobes united into a tube; within the tube 5 tiny, triangular appendages alternate with stamens; the arrow- shaped anthers united around the stigma and slightly adhering to it. - "Wild Flowers Worth Knowing", Neltje Blanchan et al.
- The Giant Skippers measure two inches or more across the expanded wings and have comparatively small heads, with the clubs of the antennae not pointed or recurved. - "Butterflies Worth Knowing", Clarence M. Weed.