1. The species has a black spot on the upper opercular margin. 2. One difference between the two species is their opercular flap. 3. The convergently evolved an opercular structure during the Early Cretaceous to Paleocene. 4. A black opercular spot is prominent and often extends onto the shoulder. 5. The opercular lobe is winged on each side. 6. The most commonly used techniques involve counting natural growth rings on the opercular series. 7. One of his major discoveries was the homology of the opercular plates of the nemesis. 8. Sources could also include one from the right opercular part of the inferior frontal gyrus. 9. The foot is large but narrow, broad anteriorly, with conspicuous opercular lobes behind. 10. Small openings to the mouth and opercular cavities of the male are maintained on both sides.
Mobile