A zeuglodon is an alternative name for a basilosaurus, a genus of early whale which lived between 40 and 34 million years ago.
Basilosaurus is the proper name for this creature. Basilosaurus died out during the Eocene extinction 33,000,000 years ago.
Zeuglodons are in the order Cetacea, which encompasses marine mammals such as whales and dolphins. They are warm blooded.
Zeuglodon, an ancient genus of whale that lived during the late Eocene to early Oligocene epochs, primarily fed on fish and squid. As a carnivorous marine mammal, it likely used its elongated body and teeth to capture and consume these prey items efficiently. Fossil evidence suggests that their diet was similar to that of modern toothed whales, adapting to available marine resources during their time.
I think it was Basilosaurus (also more correctly named Zeuglodon). It measured around 60 feet long and 100 tons (I dont know what kind of tons, though). I haven't done extensive research, but as a rule things can get bigger in the water than they can on land, and the website I checked said it rivaled the sauropods for size. Good place to start your research if nothing else.
A Photograph has been taken in Black and white. the creature appears to be something akin to a Zeuglodon or a primitive form of Whale. The photo is published in one of the books on cryptozoology. At all events it could not be a squaliform or shark-like creature.
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1. Each living thing gets one name which is uniquely its own. 2. The first name given with a description is the "correct" one. [For example, an ancient whale was originally named "Basilosaurus" under the impression that it was a reptile. Later study showed it was a mammal and it was renamed "Zeuglodon" but the old name stuck.] 3. The discoverer/describer usually gets to choose the name, but it should be based on Greek, or a mixture of Greek and Latin. 4. Zoology allows, but Botany does not, tautological names, in which genus and species names are the same, as with Bison bison, Gorilla gorilla or Tyrannus tyrannus. 5. The one time a name CAN be changed is when a proper relationship is uncovered [For example, where polar bears were found to be the descendants of brown ("grizzly") bears, their name was changed from Thalartcos maritimus to Urus maritimus.] 6. The genus is always capitalized; the species is always lowercase.