And a new shark just swam in..

OK, that's not exactly accurate. It was discovered by DNA sampling of hammerhead sharks off Belize.  But there have been at least a hundred new sharks discovered since I've been following this for the last 25 years or so, and the number known is zooming toward 450. Some are found by DNA study, some identified in the field or from catches by fisherfolk. Finder Demian Chaplin notes, "...finding of a new species in Belize highlights that there could be more undescribed ones out there, each one facing a unique set of threats.”  Shark conservation is a global problem: predators are vital to healthy ecosystems, and we're not conserving very well. 

Example of bonnethead shark (Texas Parks and Wildlife)