An historical shark’s bizarre fins helped it glide like a manta ray

Thirty million years earlier than manta rays started gracefully gliding by means of ocean waters, a shark with fantastically elongated fins gave such underwater flight a go, researchers report within the March 19 Science.

A quarry employee unearthed the fossil of the unusual shark, now dubbed Aquilolamna milarcae, in 2012 from a rock layer in northeastern Mexico relationship to about 93 million years in the past. The shark’s most distinctive characteristic is the lengthy curving fins that swoop out from its sides. Spanning practically 2 meters from tip to tip, the fins’ size rivals the wingspan of bald eagles. Nicknamed eagle shark by researchers, A. milarcae might have used the fins to stabilize itself or propel itself in a manta ray–like style.

The eagle shark’s broad, rounded head, lengthy jaws and small tooth trace that it might have been a filter feeder, sucking in floating plankton from seawater. Its torpedo-shaped physique and excessive tail fin recommend the shark was an lively swimmer, though not a very quick one, say vertebrate paleontologist Romain Vullo of the College of Rennes in France and colleagues.

A. milarcae might have been a member of a extremely various group of sharks that features extinct megalodons in addition to trendy nice whites and filter-feeding basking sharks (SN: 8/2/18). Though that group as soon as dominated the seas, lots of its members grew to become extinct after an asteroid struck Earth about 66 million years in the past.

The fossil of a newly found historical shark species, Aquilolamna milarcae, was unearthed from a quarry in northeastern Mexico in 2012. A. milarcae’s lengthy fins helped it glide underwater a minimum of 30 million years earlier than manta rays made the swimming type cool.R. Vullo et al/Science 2021
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