Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon A complete tooth with root

A complete tooth with root could be over 12 inches long

with full adulthood being reached at 36 months

Dragonflies spend the larval portion of their lives in freshwater

Mene rhombea had a laterally compressed body

but not the scales of the cone

Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon A complete tooth with rootParasaurolophus was a long crested, duck billed (hadrosaur) dinosaur. Its extremely long, backwards leaning, hollow, bony crest was as bigger than the rest of its skull and may have been used to produce a low frequency, foghorn like sound, enhance its sense of smell, and or used in courtship displays. The Parasaurolophus' nostrils (at the end of its snout) went up through the crest and back down it, forming four tubes. The crest was up to 6 feet (1. 8