This is the first cetacean fossil documented from Nicaragua and from Central America and is a rare occurrence of a mysticete
whale in Neogene strata of the tropical latitudes.
This phenomenon is more common among odontocetes than mysticetes
The new findings suggest that Odontocetes and Mysticetes
are not true evolutionary lines.
Coronulid whale barnacles did not appear in the fossil record until approximately 23 million years ago (Newman and Ross, 1976; Seilacher, 2005), after the appearance of Mysticetes
and Odontocetes in the fossil record approximately 35 million years ago.
denticrenatus represents a "missing link" that fits somewhere between ancient toothed whales and the first known fossils of the toothless Mysticetes
, says Mitchell, who suggests filter feeding in whales first developed in forms with notched teeth.
When whaling was almost done with mysticetes
in the North Pacific, a widespread style of catching occurred which was ruinous for baleen whales; the main point of this was as follows.
Though large sperm whales often yielded more than 40 barrels of oil, mysticetes
other than balaenids rarely did, particularly when only the blubber was tried out (see Mitchell and Reeves, 1983, p.