from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a group of extinct sharks from the Oligocene to Pleistocene epochs
from The Century Dictionary and Cyclopedia
- n. An extinct genus of Pelecypoda typifying the family Megalodontidæ. It is characterized by ponderous heart-shaped shells with amphidetic area, opisthodetic ligament, and large and heavy cardinal teeth. The earliest species are Devonian, but the shells are most abundant in the Triassic rocks. Properly Megalodus.
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